EMC Symmetrix DMX-3, Руководство по эксплуатации продукта

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Sparing in Symmetrix systems 215
Data Integrity, Availability, and Protection
Note: Beginning with Enginuity 5772.83.75 vault drives are eligible
for permanent sparing if there is an available spare of the same speed,
block size and capacity on the same loop as the failing drive. Vault
devices can be relocated to different positions on the same loop, but
cannot move to a different loop.
Figure 48 Permanent sparing process
3. The permanent sparing process then loads a new configuration
file in which all the mirrors initially configured on the failing
drive are now configured on the selected (new) drive.
4. The permanent sparing process begins moving data to the new
drive in parallel with the dynamic sparing process:
• The permanent sparing starts as soon as possible before the
dynamic sparing process is complete.
• While the two processes continue, the Symmetrix system
processes host I/O requests at the highest priority to minimize
any effects on performance.
5. When the permanent sparing process is complete:
• The drive used in the permanent sparing process becomes part
of the RAID group of the previously failing drive and the
system returns to normal operation.
• The drive used in the dynamic sparing process (if it was used)
is returned to the spare pool.
Permanent sparing with Enginuity 5773
2 A.
A drive is allocated for the
dynamic sparing process.
2 B.
A spare drive in a good
location is identified for the
permanent sparing process.
1.
Failed/failing
drive
3.
The permanent sparing process
loads a new configuration file
switching mirrors to the selected
new drive. The failed drive is replaced and
becomes a ready drive in the
spare pool. The dynamic spare
also becomes a ready drive in
the spare pool.
6.
After the permanent sparing process
completes, the new drive becomes a
permanent member of the group.
5.
4.
The permanent sparing process
moves data to the new drive.
SYM-001306