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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
9.2 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 87
. 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 support optional
Hot Spare sleds:
RAID Level 1:
2 Hot Spare sleds
RAID Level 10:
1 group, 2 Hot Spare sleds
RAID Level 5:
1 group, 1 Hot Spare sled
RAID Level 5:
2 groups, 2 Hot Spare sleds
If a sled becomes degraded and a Hot Spare sled
has been designated:
• the Diamond replaces 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 is not 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 automatically starts after the hot spare
is switched into the Virtual Device, even if
AutoRebuild is disabled.
• the DriveInfo command lists 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 displays on the
DriveInfo
screen as having no type, i.e, the type
field is blank. The sled cannot be accessed but
must be removed and replaced. If it is replaced,
it becomes part of any open Virtual Disk 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 new sled
becomes a Hot Spare sled.
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 (refer to
ATTO
ExpressNAV: Browser-based Interface
on page 25).
2Type
set QuickRAID1 2
3Type
SaveConfiguration Restart
The Diamond 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 browser
interface
Advanced
CLI Configuration page.
2Type
set QuickRAID10 1 2
3Type
SaveConfiguration Restart
The Diamond is configured into one RAID Level
10 group with two Hot Spare sleds.
To set up one RAID Level 5 group with one Hot
Spare sled
1 Connect to Diamond Storage Array services
(refer to
Accessing the Array
on page 17) and use
the CLI or enter ATTO ExpressNAV browser
interface
Advanced CLI Configuration page.
2Type
set QuickRAID5 1 1
3Type
SaveConfiguration Restart
The Diamond is configured into one RAID Level
5 group with one Hot Spare sled.