Removing Hard Disks Or Responding To A Disk Failure - Intel SS4000-E - Entry Storage System NAS Server User Manual

Removing Hard Disks or Responding to a Disk Failure

The effect of removing hard disks from your storage system or a disk failure varies,
depending on the disk configuration you chose when you configured the system and the
current state of the existing disks.
For example, in a linear configuration, when you remove a disk or a disk fails, the data
associated with that disk is no longer available, but the data on all the other disks remains
available.
In a RAID configuration, the effect of disk removal/failure varies, depending on the RAID
level and whether the RAID is in a normal or degraded state. You can determine the effect
of disk removal/failure by looking at the Hotplug Indicator on the Disks page. If this
indicator is GREEN, disk removal/failure has no effect on the RAID. If this indicator is
YELLOW, disk removal/failure causes RAID degradation, but you still can access all the
data. If the indicator is RED, disk removal/failure causes the entire RAID to fail.
For example, in a RAID 5 configuration, all the disks are YELLOW. Removing any one
of them causes the RAID to be degraded, but all the data is still available. However, after
you remove one disk, all the other disks become RED, since removing any one of them at
this point causes the entire RAID to fail.
Note: In a linear configuration, the Hotplug Indicator is RED for all the disks because
removing any one of them removes data from the storage system. However, this does not
adversely affect any of the other disks.
In addition, while a disk is being rebuilt, all the other disks are RED, since removing any
one of them at this point causes the RAID to fail.
If you remove a viable disk and cause only RAID degradation, you can re-install the same
disk and resume normal operation. For information about adding a disk, see
Disks" on page
Note: If you remove two or more disks, you must re-install them in the reverse order to help
maintain data integrity. For example, if you remove disk A from slot 1 and then remove
disk B from slot 2, you must re-install disk B first, then disk A.You can put the disks back
into different slots, but they must be re-installed in the opposite order from which they
were removed.
If you remove one or more viable disks and cause the entire RAID to fail, you can shut
down the storage system, re-install the same disks, and then restart the storage system. As
long as you re-install the original disks, the storage system should be able to resume
proper operation, although the integrity of the data cannot be guaranteed. However, if you
replace the removed disks with new disks, you must reconfigure your disks as described in
"Reconfiguring Your Storage System Disks" on page
Caution: Reconfiguring your disks deletes all the data on your storage system.
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Intel Entry Storage System SS4000-E User Guide
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Adding or Replacing Hard Disks
"Adding Hard
71.
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