Dell PowerVault MD3420 - Manual (Page 279)

Parameter Description
raidLevel The RAID level for the disk group. Valid values are
0, 1, 5, or 6.
owner The RAID controller module that owns the disk
group. Valid RAID controller module identifier
values are 0 and 1. The identifier value is 0 for the
RAID controller module on the top and 1 for the
RAID controller module on the bottom when
viewed from the rear of the enclosure. Use this
parameter only if you want to change the disk
group owner.
NOTE: When using this command, you can specify one or more of the parameters. You do not,
however, need to use all of the parameters. Using too many parameters can cause host I/O errors
or result in internal RAID controller module reboots because the time period ends before the disk
group definition is set.
NOTE: For configurations with more than 32 virtual disks, it is recommended you quiesce host I/O
operations when executing this command.
Troubleshooting
Attempting to expand large disk groups by adding physical disks, also called Dynamic Capacity Expansion
(DCE), may fail with the one of the following messages:
• Return code: Error 26—The modification operation cannot complete because of
the number of physical disks in the disk group and the segment size of the
associated virtual disks. Reduce the segment size of all virtual disks in the
disk group to 128 KB or below using the Change Segment Size option. Then,
retry the operation.
• Return code: Error 462—A SYMbol procedure could not be carried out because
the firmware could not allocate sufficient cache memory. Operation when error
occurred: PROC_startVolum.
In addition, a Major Event Log (MEL) event indicating insufficient cache available to complete the DCE
operation may occur.
DCE requires enough memory to buffer the data read from the original virtual disk and the data to be
written to the expanded virtual disk. Some combination of number of physical disks in the expansion
operation, stripe size, and whether mirroring is enabled may result in less memory being available to
complete the DCE operation. In such a scenario, try each of the options below and retry the operation:
• Create the required disk group size using other unassigned physical disks.
• Delete the current disk group and then recreate the disk group with the desired number of physical
disks.
• Reduce the segment size being used and then retry the operation.
Set Disk Group Forced State
Description
This command moves a disk group into a Forced state. Use this command if the start diskGroup
import command does not move the disk group to an Imported state or if the import operation does
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