ATTO Technology VT-Class Optional Hot Spare Sled, To set up RAID Level 10 with Hot Spare sleds

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:

1if a Virtual Device is missing a sled or you are hot swapping a sled, the new sled becomes part of the existing Virtual Device.

2if 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

1Connect to Diamond-VT services (see

Accessing the Diamond-VTon page 15) and use the CLI.

2Type set QuickTape RAID10 15 1 enabled

3Type 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

1Type set QuickTape RAID5 30 2 enabled

2Type SaveConfiguration Restart

The Diamond-VT will be configured into RAID Level 5 with two tape drives, 30 tape volumes and two hot spare sleds.

50 Hot swap spare sled