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Chapter 10 Component Management
10.2 Functions in the Action Area for Component
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
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2 Click the [OK] button.
→ Releasing of the Global Hot Spare starts.
3 Click the [Done] button to return to the [Disks] screen.
End of procedure
10.2.6 Assign Dedicated Hot Spare
This function registers a drive as a Dedicated Hot Spare for a RAID group.
A Dedicated Hot Spare is a spare drive (hot spare) that is registered in the RAID group instead of the failed
drive when a drive failure is occur. A Dedicated Hot Spare, unlike a Global Hot Spare, is used only for the
specific RAID group.
If a drive fails, data copy (rebuild) to a Dedicated Hot Spare starts automatically.
When a failed drive is replaced, the data is copied back from the Dedicated Hot Spare that is substituting for
the failed drive, and the Dedicated Hot Spare then returns to a spare drive.
• Drives that are currently used cannot be registered as Dedicated Hot Spares.
• Make sure to register a Dedicated Hot Spare with the same or a larger capacity than the data drives. If the
Dedicated Hot Spare capacity is smaller than the data drive, the drive does not work as the hot spare.
• When a mix of SAS disks, Nearline SAS disks, SSDs, and SEDs are installed together in the ETERNUS DX
Disk storage system, Dedicated Hot Spare of each type is required. Register the Dedicated Hot Spare with
the same capacity as the maximum capacity drive for each type.
• Only one RAID group can be registered for each Dedicated Hot Spare. A Dedicated Hot Spare cannot be
registered to multiple RAID groups.
• Dedicated Hot Spares cannot be registered for a RAID group that belongs to a TPP, an FTRP, or an REC Disk
Buffer.
• When the failed drive and the Dedicated Hot Spare are switched, a Dedicated Hot Spare with the same
capacity as the failed drive is used on a priority basis. If there is no Dedicated Hot Spare with the same
capacity, a Dedicated Hot Spare with a larger capacity than the failed drive is used.
• If the Dedicated Hot Spare is registered for a RAID group to which a failed drive belongs, the Dedicated
Hot Spare is used before the Global Hot Spare. If there is no unused Dedicated Hot Spare and the drive
fails, the Global Hot Spare is used.
• Hot Spares can be registered any slots of the CEs (only for the ETERNUS DX80 S2/DX90 S2) and the DEs.