The drives which are used to build failed drives data is called Hot Spare drives. These hot sparing drives should be compatible with the failed drives.
From VNX OE for Block 5.33, any unbound drive can be considered
as spare. EMC recommends configuring hot spare policy to spare 1 per 30 disks.
The following steps outline the steps to configure Hot Sparing
on EMC VNX systems.
1.
Login to EMC Unisphere and navigate to
appropriate VNX system
2.
Hover over “System” and select “Hot Spare Policy”
3.
Select appropriate Disk Type to configure Hot
Spare Policy. In this example, if you observe NL SAS drives, Hot Spare Policy
configured as “No Hot Spares” It doesn’t mean that there will be no hot spares
for NL SAS drives. Any unbound drive will be used as Hot Spare drive if a drive
failure occurs.
4.
If you want to change the Hot Spare policy,
select appropriate disk type, select Hot Spare Policy as “ Recommended” or “Custom”
and change number of disks in “keep unused per policy’ row.
It’s recommended to ensure that unbound drives are available
for each drive type installed on the system. For example, if you have SAS and
NL-SAS installed on system there should be unbound SAS and NL-SAS available as
hot spare drives.
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Helpful document .
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