Dell 341-7212 User Guide - Page 55

Making a Drive Offline or Missing, Preserving Pinned Cache

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Making a Drive Offline or Missing If a disk drive is currently part of a redundant configuration and you want to use it in another configuration, you can use Dell SAS RAID Storage Manager commands to remove the disk drive from the first configuration for this purpose. When you do this, all data on that drive is lost. To remove the disk drive from the configuration without harming the data on the virtual disk, follow these steps: 1 In the left panel of the Dell SAS RAID Storage Manager window, rightclick on the icon of a disk drive in a redundant virtual disk. 2 Select Make drive offline from the popup menu. The disk drive status changes to Offline. 3 Right-click the disk drive icon again and select Mark physical disk as missing. 4 Select File-> Rescan. The disk drive status changes to UNCONFIGURED & GOOD. At this point, the data on this disk drive is no longer valid. 5 If necessary, create a hotspare disk for the virtual disk from which you have removed the disk drive. (See Adding Hotspare Disks.) When a hotspare is available, the data on the virtual disk will be rebuilt. You can now use the removed disk for another configuration. NOTE: If Dell SAS RAID Storage Manager detects that a disk drive in a virtual disk has failed, it makes the drive offline. If this happens, you must remove the disk drive and replace it. You cannot make the drive usable for another configuration by using the Mark physical disk as missing and Rescan commands. Preserving Pinned Cache If a virtual disk becomes offline or is deleted for any reason, the firmware preserves the dirty cache from the virtual disk. This preserved dirty cache is called pinned cache, and is preserved until you import the virtual disk, or discard the cache. NOTE: The pinned cache information applies only to the PERC 6 controllers. Maintaining and Managing Storage Configurations 55

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Maintaining and Managing Storage Configurations
55
Making a Drive Offline or Missing
If a disk drive is currently part of a redundant configuration and you want to
use it in another configuration, you can use Dell SAS RAID Storage Manager
commands to remove the disk drive from the first configuration for this
purpose. When you do this,
all data on that drive is lost
.
To remove the disk drive from the configuration without harming the data on
the virtual disk, follow these steps:
1
In the left panel of the Dell SAS RAID Storage Manager window, right-
click on the icon of a disk drive in a redundant virtual disk.
2
Select
Make drive offline
from the popup menu. The disk drive status
changes to Offline.
3
Right-click the disk drive icon again and select
Mark physical disk as
missing
.
4
Select
File-> Rescan
. The disk drive status changes to
UNCONFIGURED & GOOD. At this point, the data on this disk drive is
no longer valid.
5
If necessary, create a hotspare disk for the virtual disk from which you have
removed the disk drive. (See
Adding Hotspare Disks
.)
When a hotspare is available, the data on the virtual disk will be rebuilt.
You can now use the removed disk for another configuration.
NOTE:
If Dell SAS RAID Storage Manager detects that a disk drive in a virtual disk
has failed, it makes the drive offline. If this happens, you must remove the disk drive
and replace it. You cannot make the drive usable for another configuration by using
the
Mark physical disk as missing
and
Rescan
commands.
Preserving Pinned Cache
If a virtual disk becomes offline or is deleted for any reason, the firmware
preserves the dirty cache from the virtual disk. This preserved dirty cache is
called pinned cache, and is preserved until you import the virtual disk, or
discard the cache.
NOTE:
The pinned cache information applies only to the PERC 6 controllers.