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'raid_diagnostic' command, SmartView Monitor, 'cpstat' command and 'snmpwalk' command show "MISSING" state for some harddisks
Symptoms
  • Output of "raid_diagnostic" command shows "State:MISSING" for one of hard disks.

    Example:

    [Expert@HostName]# raid_diagnostic
    Raid status:
    VolumeID:0 RaidLevel: RAID-1 NumberOfDisks:2 RaidSize:465GB State:OPTIMAL Flags:ENABLED
    DiskID:0 DiskNumber:0 Vendor:ATA      ProductID:WDC WD5003ABYZ-0 Revision:01.0 Size:465GB State:MISSING Flags:NONE
    DiskID:1 DiskNumber:1 Vendor:ATA      ProductID:WDC WD5003ABYZ-0 Revision:01.0 Size:465GB State:ONLINE Flags:NONE
    [Expert@HostName]# 
    
  • Output of "cpstat os -f raidInfo" command shows:

    • In "Volume list" table":
      Volume state = "0" (meaning optimal)

    • In "Disk list" table:
      Disk state = "1" for one of hard disks (meaning missing)
  • SmartView Monitor shows:

    • In "RAID Volumes" table:
      State = "Optimal"

    • In "RAID Volume Disks" table:
      State = "Missing" for one of hard disks
  • Output of "snmpwalk -c <community> -v 2c localhost 1.3.6.1.4.1.2620.1.6.7.7.2.1.9 1.0" command on the problematic machine returns "1" for one of hard disks (meaning missing):

    SNMPv2-SMI::enterprises.2620.1.6.7.7.2.1.9.1.0 = INTEGER: 1
Cause

Several harddisk devices were caught in the same query, which leads to reporting a "MISSING" state.

In the example below, the harddisk device with ID 11:0:0:0 and harddisk device with ID 1:0:0:0 were caught in the same query:

[Expert@HostName]# ls /sys/bus/scsi/devices/
10:0:0:0  11:0:0:0  1:0:0:0  2:0:0:0  9:0:0:0
[Expert@HostName]#

This can happen after plugging in and out USB devices, or after restarting the LOM card.


Solution
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