Chapter 7. Storage pools 299
The percentage bar that is shown in Figure 7-5 indicates how much capacity is allocated.
Figure 7-5 Internal storage allocation indicator
7.1.2 Actions on internal drives
There are a number of actions that can be performed on the internal drives when you select
them and right-click or click the Actions drop-down menu, as shown in Figure 7-6.
Figure 7-6 Internal drive Actions menu
Fix Error
The Fix Error action starts the Directed Maintenance Procedure (DMP) for a defective drive.
For more information, see Chapter 12, “RAS, monitoring, and troubleshooting” on page 559.
Take Drive Offline window
The internal drives can be taken offline when there are problems with the drives. A
confirmation window opens, as shown in Figure 7-7 on page 300.
300 Implementing the IBM Storwize V5000
Figure 7-7 Take internal drive offline warning
A drive should be taken offline only if a spare drive is available. If the drive fails (as shown in
Figure 7-8), the MDisk (of which the failed drive is a member) remains online and a hot spare
is automatically reassigned.
Figure 7-8 Internal drive taken offline
If no sufficient spare drives are available and one drive must be taken offline, the second
option for no redundancy must be selected. This option results in a degraded MDisk, as
shown in Figure 7-9.
Figure 7-9 Internal drive that is failed with MDisk degraded
Chapter 7. Storage pools 301
The IBM Storwize V5000 storage system prevents the drive from being taken offline if there
might be data loss as a result. A drive cannot be taken offline (as shown in Figure 7-10) if no
suitable spare drives are available and, based on the RAID level of the MDisk, drives are
already offline.
Figure 7-10 Internal drive offline not allowed because of insufficient redundancy
Example 7-1 shows how to use the chdrive CLI command to set the drive to failed.
Example 7-1 The use of the chdrive command to set drive to failed
chdrive -use failed driveID
chdrive -use failed -allowdegraded driveID
Mark as
The internal drives in the IBM Storwize V5000 storage system can be assigned to the
following usage roles, as shown in Figure 7-11 on page 302:
򐂰 Unused: The drive is not in use and cannot be used as a spare.
򐂰 Candidate: The drive is available for use in an array.
򐂰 Spare: The drive can be used as a hot spare, if required.
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Figure 7-11 Internal drive Mark as... option
The new role that can be assigned depends on the current drive usage role. These
dependencies are shown in Figure 7-12.
Figure 7-12 Internal drive usage role table
Identify
Use the Identify action to turn on the LED light so that you can easily identify a drive that must
be replaced or that you want to troubleshoot. The panel that is shown in Figure 7-13 on
page 303 appears when the LED is on.
Chapter 7. Storage pools 303
Figure 7-13 Internal drive identification
Click Turn LED Off when you are finished.
Example 7-2 shows how to use the chenclosureslot command to turn on and off the drive
LED.
Example 7-2 The use of the chenclosureslot command to turn on and off drive LED
chenclosureslot -identify yes/no -slot slot enclosureID
Show Dependent Volumes
Clicking Show Dependent Volumes shows you volumes that are dependent on the selected
drive. Volumes are dependent on a drive only when the underlying disks or MDisks are in a
degraded or inaccessible state and removing further hardware causes the volume to go
offline. This condition is true for any RAID 0 MDisk or if the associated MDisk is degraded
already.
Use the Show Dependent Volumes option before you perform maintenance to determine
which volumes are affected.
Figure 7-14 shows an example if no dependent volumes are detected for this specific drive.
Figure 7-14 Internal drive no dependent volume
Important: A lack of listed dependent volumes does not imply that there are no volumes
created that use this drive.

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