ATTO Technology Diamond Storage Array S-Class - Manual (Page 84)

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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
7.2 Optional Hot Spare Sled
To maintain array up time with minimal risk of data loss, individual sleds which fail may be replaced
with a spare sled in some configurations.
In most configurations, if a member of a virtual
device becomes degraded, you must swap out the
faulted sled as defined in
Hot Swap Operating
Instructions on page 71 . If you have not enabled
AutoRebuild , you must also start a manual rebuild.
For four configurations, however, Hot Spare sleds
may be designated as replacements for faulted
sleds without intervention by you or a host.
Each configuration requires a certain number of
Hot Spare sleds. These sleds, once designated as
Hot Spares, are not available for other use.
The following configurations will support
optional Hot Spare sleds
• RAID Level 1: 2 Hot Spare sleds (see
Exhibit 7.2-1)
• RAID Level 10: 1 group, 2 Hot Spare sleds (see
Exhibit 7.2-2)
• RAID Level 5:1 group, 1 Hot Spare sled (see
Exhibit 7.2-3)
• RAID Level 5: 2 groups, 2 Hot Spare sleds (see
Exhibit 7.2-3)
Note
All arrays using RAID Level 10 and Hot Spares
options must be fully populated.
If a sled becomes degraded and a Hot Spare sled
has been designated
• the Diamond will replace the degraded sled with
the Hot Spare sled, simulating a hot swap of a
sled with AutoRebuild enabled, without
intervention
• any sled with a Faulted drive will not be used.
Faulted sleds maintain their faulted status until
they are removed and re-inserted or if the
system is restarted.
• Hot Spares are handled as sleds, not as
individual drives
• the Hot Spare sled replaces the Faulted sled in
the Virtual Device
• a rebuild will automatically start after the hot
spare is switched into the Virtual Device, even if
AutoRebuild is disabled.
• the DriveInfo command will list the number of
Hot Spare sleds currently in the system
• you can replace the faulted drive or sled later.
However, faulted is a non-persistent state. After
a power cycle, the faulted sled will display on the
DriveInfo screen as have no type, i.e, the type
field will be blank. The sled cannot be accessed
but must be removed and replaced. If it is
replaced, it will be assigned in this order
1 if a Virtual Device is missing a sled or you are
hot swapping a sled, the new sled becomes
part of the existing Virtual Device.
2 if a Hot Spare sled is missing, the replacement
sled will become a Hot Spare sled.
CAUTION CAUTION
In a Hot Spare configuration, a drive sled
should only be taken offline if there is
absolutely no activity on that drive. If there
is any activity, the rebuild of the Hot Spare
sled may be flawed.
To set up RAID Level 1 with Hot Spare sleds
1 Connect to Diamond Storage Array services
(refer to
Accessing the Array on page 17) and use
the CLI or enter ATTO ExpressNAV Advanced
CLI Configuration page.
2 Type set QuickRAID1 2
3 Type SaveConfiguration Restart
The array is configured into one RAID Level 1
group with two Hot Spare sleds.
To set up RAID Level 10 with Hot Spare sleds
1 Connect to Diamond Storage Array services
(refer to
Accessing the Array on page 17) and use
the CLI or enter ATTO ExpressNAV interface
Advanced CLI Configuration page.
2 Type set QuickRAID10 1 2
3 Type SaveConfiguration Restart
The array is configured into one RAID Level 10
group with two Hot Spare sleds.