技術的な情報発信を目的としておらず、うちの若い子たちに説明するネタをメモとして書きためてます。
NCCとは
NCCとはNutanix Cluster Checkの略称と思われNutanixのヘルスチェックをするツール？です。
Prism ElementやCVMからCLIで実行することができます。
Prism Elementからだとこんな感じで実行します。
実行するとこんな感じ
CVMからはncc health_checks run_allを実行します。以下のように171項目くらいのチェックをしてくれます。
(CVMやAHVホスト、IPMIのIPアドレスやらシリアルナンバーやらを含んでいますので、それらは神経質に排除しています。残ってたらこっそり教えてください。しれっと消しますので、、、)
nutanix@NTNX--A-CVM::~$ ncc health_checks run_all
ncc_version: 3.1.2-84909c57
cluster id:
cluster name: (clusterName)
node with service vm id 6
service vm external ip:
hypervisor address list: [u'']
hypervisor version:
ipmi address list: [u'']
software version:
software changeset ID:
node serial:
rackable unit:
node with service vm id 7
service vm external ip:
hypervisor address list: [u'']
hypervisor version:
ipmi address list: [u'']
software version:
software changeset ID:
node serial:
rackable unit:
node with service vm id 8
service vm external ip:
hypervisor address list: [u'']
hypervisor version:
ipmi address list: [u']
software version:
software changeset ID:
node serial:
rackable unit:
node with service vm id 9
service vm external ip:
hypervisor address list: [u'']
hypervisor version:
ipmi address list: [u'']
software version:
software changeset ID:
node serial:
rackable unit:
Running : health_checks run_all
[==================================================] 100%
/health_checks/hardware_checks/disk_checks/boot_raid_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/sar_checks/ssd_latency_threshold_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/lsi_firmware_rev_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/bmc_bios_version_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/sas_connectivity_status_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cvm_same_ncc_version_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/remote_site_checks/remote_site_config_chec
k [ FAIL ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/metadata_mounted_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/vstore_pd_file_co
unt_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/same_hypervisor_version_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/all_flash_nodes_intermixed_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cvm_services_status [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/fileserver_checks/fileserver_cvm_checks/file_server_status_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cluster_version_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/cassandra_checks/cassandra_log_crash_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cpu_aes_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/metro_vstore_syml
inks_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/email_alerts_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/kernel_memory_usage_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/stargate_checks/garbage_egroups_size_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/incomplete_disk_removal_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/storage_container_replication_factor_check[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/host_nic_error_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/sufficient_disk_space_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/protection_domain
_file_conflict_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/host_pingable_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/sspm1633_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/toshiba_pm3_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/cloud_checks/aws_instance_type_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/internal_consiste
ncy_group_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/check_ntp [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/cloud_checks/cloud_remote_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/storage_pool_space_usage_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/sm863_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/cloud_checks/aws_instance_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/remote_site_checks/remote_site_has_virtual
_ip_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/stargate_checks/unresponsive_stargate_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/host_cvm_subnets_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/inode_usage_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/check_vhdx_disks
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/sp_usage_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/m10_gpu_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/metro_availability_checks/metro_automatic_checkpoint_snapshot_che
ck [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/stargate_checks/dedup_auto_disabled_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/vstore_cg_file_co
unt_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/disk_storage_pool_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/m2_intel3520_ssd_status_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/content_cache_dedup_ref_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cluster_services_status [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cvm_same_timezone_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/cassandra_checks/cassandra_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/cvm_virtual_hardware_version_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/host_disk_usage_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/mellanox_nic_driver_version_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/cassandra_checks/ring_balance_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/cloud_checks/cloud_remote_version_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/host_swap_rate [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/fru_fields_correctness_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/sata_dom_wearout_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/storage_container_space_usage_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/duplicate_cvm_ip_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cvm_connectivity [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/vdisk_count_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/vm_swap_rate [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/snapshot_chain_height_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/hwclock_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/vstore_max_num_of
_vms_supported_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/10gbe_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/fileserver_checks/fileserver_cvm_checks/file_server_protect_statu
s_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cvm_memory_usage_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/metro_availability_checks/backup_snapshots_on_metro_secondary_che
ck [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/cassandra_checks/nodetool_consistency_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/metro_availability_checks/secondary_metro_pd_in_sync_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/ipmi_checks/ipmi_sensor_threshold_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/remote_site_checks/remote_site_connectivit
y_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/host_cpu_contention [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/snapshot_space_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/stargate_checks/ondisk_dedup_enabled_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/cvm_memory_reservation_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/zkinfo_check_plugin [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/dimm_interop_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/ldap_config_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/pds_share_vms_che
ck [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/remote_support_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/gpu_driver_installed_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/m60_gpu_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/nic_link_down_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/intel_ssd_configuration_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/protected_vms_on_
nutanix_storage_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/fileserver_checks/fileserver_cvm_checks/file_server_remote_site_s
tatus_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/backup_schedule_c
heck [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/fio_ecc_errors_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/fileserver_checks/fileserver_cvm_checks/multiple_fsvm_on_single_n
ode_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/factory_config_validation_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/toshiba_pm4_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/pd_clones_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/disk_id_duplicate_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/deleted_file_fd_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/degraded_node_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/remote_site_checks/remote_site_has_correct
_cluster_info_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/zeus_config_ip_address_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/uvm_ide_disk_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/storage_container
_mount_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/quad_nic_driver_version_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/ssd_firmware_version_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/host_rx_packets_drop [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/vm_checks [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/metro_availability_checks/unsupported_vm_config_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cvm_reboot_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/unreserved_available_space_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/recovery_point_av
ailability_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cvm_memory_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/alert_manager_service_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/metro_availability_checks/data_locality_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/snapshot_file_loc
ation_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/cassandra_checks/cassandra_log_memory_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/curator_scan_time_elapsed_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/mellanox_nic_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/zkalias_check_plugin [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/nvme_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/remote_site_checks/remote_site_time_sync_c
heck [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/ngt_ca_setup_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/host_connectivity [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/cluster_services_down_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/cloud_checks/check_cloud_gflags [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/m2_micron5100_ssd_status_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/check_vm_pinning_config [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/linked_clones_on_dedup_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/disk_online_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/hostname_resolution_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/unsupported_vm_co
nfig_vstore_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/chassis_cpus_type_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/rsyslog_connectivity_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/vg_space_usage_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/check_erasure_code_config [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/http_proxy_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/remote_stargate_v
ersion_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/sata_controller_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/gflags_diff_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/duplicate_vm_name
s_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/cassandra_checks/cassandra_keyspace_cf_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/fileserver_checks/fileserver_cvm_checks/file_server_upgrade_task_
stuck_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/cross_hypervisor_
ngt_installed_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/cassandra_checks/cassandra_similar_token_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/stargate_checks/oplog_episode_count_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/file_permission_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/fileserver_checks/fileserver_cvm_checks/multiple_file_server_vers
ions_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/disk_usage_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/sar_checks/hdd_latency_threshold_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/data_protection_checks/protection_domain_checks/aged_third_party_
backup_snapshot_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/sata_dom_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/inter_cvm_connections_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/inter_cvm_ping_latency_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/sar_checks/sar_stats_threshold_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/virtual_ip_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/pm863a_status_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/vm_io_latency_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/intel_ecc_errors_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/auto_support_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/rpo_validation_on_storage_heavy_cluster [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/ipmi_checks/ipmi_sel_correctable_ecc_errors_check
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/aegis_page_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/network_checks/cvm_time_drift_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/dns_server_check [ INFO ]
-------------------------------------------------------------------------------+
/health_checks/stargate_checks/compression_disabled_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hypervisor_checks/orphan_vm_snapshot_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/m10_m60_gpu_mixed_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/disk_checks/disk_smartctl_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/system_checks/check_virtual_ip_is_in_cluster_external_subnet
[ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/ipmi_checks/ipmi_sel_check [ PASS ]
-------------------------------------------------------------------------------+
/health_checks/hardware_checks/ipmi_checks/ipmi_check [ PASS ]
-------------------------------------------------------------------------------+
Detailed information for remote_site_config_check:
Node :
FAIL: Remote site: (RemoteSite Name)
Number of vstores mapped for the local site on the remote site are not same.
Refer to KB 3335 (http://portal.nutanix.com/kb/3335) for details on remote_site_config_check or Recheck with: ncc health_checks data_protection_checks remote_site_checks remote_site_config_check
Detailed information for dns_server_check:
Node :
INFO: Only one name server is configured
Node :
INFO: Only one name server is configured
Node :
INFO: Only one name server is configured
Node :
INFO: Only one name server is configured
Refer to KB 3005 (http://portal.nutanix.com/kb/3005) for details on dns_server_check or Recheck with: ncc health_checks system_checks dns_server_check --cvm_list=,,,
+---------------+
| State | Count |
+---------------+
| Pass | 169 |
| Info | 1 |
| Fail | 1 |
| Total | 171 |
+---------------+
Plugin output written to /home/nutanix/data/logs/ncc-output-latest.log
nutanix@NTNX--A-CVM::~$
ここではInfoで「DNSサーバのIPアドレスが1つしか設定されていないよ！」ということと、Failで「レプリケーションの設定がおかしいよ！」と教えてくれてますね。
古いNCCを使ってた時に困ったこと
先日、NutanixのAOSを5.0.xから5.1.3にバージョンアップしたのですが、AOS 5.1.3にはNCC3.1.2がバンドルされおり、NCCもバージョンアップされ、抱えていた運用課題を一つ解決することができました。
どのような課題かというと、「CVMが使っていない」ネットワークポートがリンクダウンしても検知されなかったのです。
うちの環境ではデフォルトで作成されているbr0のほか、br1を作成し仮想マシンはbr1を使うようにしているのですが、例えばbr1に属しているNICのLANケーブルが抜けたとしてもNutanix側からは検知できず、スイッチの管理をしているネットワークチームからの連絡や、両方落ちてしまった時に仮想マシンに対して実施している死活監視にひっかかりはじめて、ポートが落ちたことを知ることができます。これを知った時、「うわ、マジかよ」と思った記憶があります。
特にネットワークの分離を考えている方は。NCCはできる限り新しいものを使った方がいいかもしれない。それより変に分離を考えるよりはbr0で完結させるほうがいいと思う。その方がシンプルだし。うちはネットワーク構成上、仕方なくやってるだけだし。。。