ATTO Technology Diamond Storage Array VT-Class - Manual (Page 61)

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Hot swap spare sled
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 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 69. If you have not enabled
AutoRebuild , you must also start a manual
rebuild.
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.
• RAID Level 10: 10 drive sleds and two Hot Spare
sleds (sleds 11 and 12).
• RAID Level 5: 10 drive sleds and two Hot Spare
sleds (sleds 11 and 12)
• RAID Level 5: five drive sleds (sled positions 1
through 5) and one Hot Spare sled (sled 12).
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 having 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 become 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 will
become a Hot Spare sled.
The simplest way to set up Hot Spare sleds is to
use the ExpressNAV interface. However, you may
use the CLI as follows:
To set up RAID Level 10 with Hot Spare sleds
1 Connect to Diamond-VT services (see
Accessing the Diamond-VT on page 15) and use
the CLI.
2 Type set QuickTape RAID10 15 1 enabled
3 Type SaveConfiguration Restart
The Diamond-VT will be configured into RAID
Level 10 with one tape drive, 15 tape volumes and
two Hot Spare sleds.
To set up RAID Level 5 and Hot Spare sleds
1 Type set QuickTape RAID5 30 2 enabled
2 Type SaveConfiguration Restart
The Diamond-VT will be configured into RAID
Level 5 with two tape drives, 30 tape volumes and
two hot spare sleds.