Identifying and Verifying a Failed Disk Module
61
Figure 5-2
Disk Module Locations
3.
If you have not already checked the module status with raid5 getdisk, do
so now; see “Getting Information About Disks” in Chapter 3.
4.
If you have not already checked the unsolicited error log for a message
about the disk module, as explained in “Displaying the CHALLENGE
RAID Unsolicited Event Log” in Chapter 3, do so now.
A message about the disk module contains its module ID (such as A0 or
B3). Check for any other messages that indicate a related failure, such as
failure of a SCSI bus or a general shutdown of a chassis, that might
mean the disk module itself has not failed.
Note:
If you are using storage system caching, the system uses modules
A0, B0, C0, D0, and E0 for its cache vault. If one of these modules fails,
the storage system dumps its cache image to the remaining modules in
the vault; then it writes all dirty (modified) pages to disk and disables
caching. The cache status changes, as indicated in the output of the raid5
getcache command. Caching remains disabled until you insert a
replacement module and the storage system rebuilds the module into
the physical disk unit. For information on caching, see Chapter 7.
A0
B0
C0
D0
A2
B2
C2
D2
E2
E0
A1
B1
C1
D1
A3
B3
C3
D3
E3
E1
A0 B0 C0 D0
A1 B1 C1 D1 E1
E0 A2 B2 C2 D2
A3 B3 C3 D3 E3
E2
Deskside
Chassis assembly in rack
5 to 20 disk modules in groups of 5
