Recovering From A Drive Failure; Automatic Rebuild - Silicon Graphics InfiniteStorage 6120 User Manual

4.4

Recovering from a Drive Failure

When a drive failure occurs on the InfiniteStorage 6120, the storage pool containing that drive will
begin operating in degraded mode. This means that the storage pool will continue to handle I/O
commands from the host, but there will be no redundancy to protect against additional drive failures
on the same storage pool. If another disk drive fails on the same storage pool before the data on the
first drive is rebuilt (to a replacement disk or hot spare), the storage pool will go offline.
If one drive in a storage pool fails, the data or parity information on the failed drive will be
reconstructed from the parity disk and data disks of that storage pool.
4.4.1

Automatic Rebuild

A single drive failure in any storage pool does not result in the data loss. The virtual disk(s) on that
storage pool will continue to operate in degraded mode. If a spare drive is available and automatic
rebuild is enabled, the InfiniteStorage 6120 will automatically rebuild the data on the spare drive.
NOTE : System performance will be impacted while recovery is taking place.
When a drive failure occurs, the error is written to the event log. The controller will rebuild the drive
automatically once it finds a suitable spare drive. You may monitor the rebuild progress or adjust the
rebuild rate to match the user load.
To display the event log
Figure 92. Display Event Log
RAID$ show controller local log
000041 2009-02-04 15:03:17:7295774
LOG_ST_POOL_CHANGE
000042 2009-02-04 15:03:17:7295780
LOG_ST_MEMBER_CHANGE
POOL:0003 INDEX:0000 STATE:0003
000043 2009-02-04 15:03:17:7295810
LOG_ST_REBUILD_START
POOL:0003 INDEX:0000 FENCE:0000000000000000
To look at the failed drive
Figure 93. Display Failed Drive
0 0 7 - 5 5 3 3 - 0 0 1
, use the SHOW CONTROLLER LOCAL LOG command.
(Figure 92)
STATE POOL CHANGE
STATE MEMBER
STATE REBUILD START
, enter command SHOW UNASSIGNED_POOL FAILED ALL
(Figure 93)
RAID$ show unassigned_pool failed all
OID: 0x20a7003f
Pool OID: UNASSIGNED
Capacity: 704512 MBs (0x56000000 blocks)
Raw Capacity: 715404 MBs (0x575466f0 blocks)
Block Size: 512
Enabled Disk Ch: 0x27 0x22
Disk Slot: 1:42
Vendor ID: Hitachi
Product ID: Hitachi HUA721075KLA330
Product Revision: GK8OAB0A
Serial Number: GTF200P8GBVPXF
Health State: FAILED
Rotation Speed: 7200 RPM
Device Type: SATA
Member State: UNASSIGNED
Spare: FALSE
Failed: TRUE
UUID: 0x5000cca215c564560
Recovering from a Drive Failure
G=4 S=0 T=1 RP=0 VP=1
POOL:0003 STATE:0005
G=4 S=0 T=1 RP=0 VP=1
CHANGE ID:5000cca215c56e02 PDIDI:0145
G=4 S=0 T=1 RP=0 VP=1
ID:5000cca215c56e02 PDIDI:0145
Physical Location
Enclosure 1 Drive Slot 42
State Change
on Pool:0003
Drive Replacement
Rebuild Initiated
on Spare Drive
70