複数のディスク障害が発生した場合にアグリゲートがオフラインになるのはなぜですか
環境
- ONTAP 9
- AFF
- FAS
回答
- RAID 4 の場合は 2 つ以上
- RAID-DP で 3 つ以上
- RAID-TEC では 4 つ以上
RAID-DP の例：
Cluster::> run -node Node-01 sysconfig -r
- バックアップ前：
RAID group Aggr1/plex0/rg1 (normal, block checksums)
RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks)
--------- ------ ------------- ---- ---- ---- ----- -------------- --------------
dparity 0a.12.16 0a 12 16 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
parity 0a.12.17 0a 12 17 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
...
data 0a.11.6 0a 11 6 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.7 0a 11 7 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.8 0a 11 8 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.9 0a 11 9 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.10 0a 11 10 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.19 0a 11 19 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.12 0a 11 12 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.13 0a 11 13 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.14 0a 11 14 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.15 0a 11 15 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
...- 2つのディスクの障害：
RAID group Aggr1/plex0/rg1 (double degraded, block checksums)
RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks)
--------- ------ ------------- ---- ---- ---- ----- -------------- --------------
dparity 0a.12.16 0a 12 16 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
parity 0a.12.17 0a 12 17 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
...
data 0a.11.6 0a 11 6 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data FAILED N/A 857000/ -
data 0a.11.8 0a 11 8 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.9 0a 11 9 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.10 0a 11 10 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.19 0a 11 19 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.12 0a 11 12 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.13 0a 11 13 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data FAILED N/A 857000/ -
data 0a.11.15 0a 11 15 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
...- 3つ以上のディスク障害：
Aggregate Aggr1 (failed, raid_dp, partial) (block checksums)
Plex /Aggr1/plex0 (offline, failed, inactive)
RAID group /Aggr1/plex0/rg1 (normal, block checksums)
RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks)
--------- ------ ------------- ---- ---- ---- ----- -------------- --------------
dparity 0a.12.16 0a 12 16 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
parity 0a.12.17 0a 12 17 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
...
data 0a.11.6 0a 11 6 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data FAILED N/A 857000/ -
data 0a.11.11 0a 11 11 SA:B 0 SAS 15000 857000/1755136000 858483/1758174768 (reconstruct stalled)
data 0a.11.9 0a 11 9 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.10 0a 11 10 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data FAILED N/A 857000/ -
data 0a.11.12 0a 11 12 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data 0a.11.13 0a 11 13 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
data FAILED N/A 857000/ -
data 0a.11.15 0a 11 15 SA:B 0 SAS 10000 857000/1755136000 858483/1758174768
...
Raid group is missing 3 disks.