3-4 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
If the filer finds a media error on a data disk, it prints the following message:
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If the filer finds more than one bad block, it prints the following message:
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The following sample messages appear after disk scrubbing is complete:
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In addition to data disks and parity disks, the filer supports zero or more hot spare
disks. A hot spare disk is not part of any RAID group and does not contain file system
data. After a disk failure, the filer automatically rebuilds data (or parity) onto a hot
spare disk, which then replaces the failed disk in the RAID group. This procedure
avoids a system shutdown and returns the system to full performance.
A hot spare disk cannot replace a failed disk that is larger than itself. If you use only
one hot spare disk in a filer, the hot spare disk must be as large as the largest file sys-
tem disk. If you have multiple hot spare disks installed, the system uses the smallest
hot spare disk needed to replace the failed disk.
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The filer enables you to hot swap disk drives. Hot swapping a disk drive means install-
ing or removing it from the PowerVault 700N storage system while the filer is running,
with minimal interruption to a file system. For example, you might want to hot swap a
disk into a filer to replace a disk or to add a hot spare disk.
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A disks usable space can be different from its physical space. The information here
applies to data, parity, and hot spare disks.
Disks from different manufacturers might differ slightly in size even though they
belong to the same size category.
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If one block on a data disk fails, the filer uses the parity disk in its RAID group to
reconstruct the data on that block. The block is mapped to a new location on disk. If
an entire data disk fails, the parity disk for that RAID group prevents any data loss and
enables the filer to continue running.
Although the filer can continue to function with a failed disk, if it cannot reconstruct
that failed disk on a hot spare, it automatically shuts down after 24 hours to