Hp StorageWorks Scalable File Share Uživatelský manuál stáhnout pdf (Strana 350)

RAID rebuild timing informationD–2

D.1 RAID rebuild information

The time taken for a RAID rebuild operation on an SFS20 array is divided into two parts:

• The time taken to rebuild the spare disk

• The time taken to rebuild subsequently to a replacement disk (when the disk has been added)

NOTE: All SFS20 arrays are configured with a spare disk; as a result of this, the rebuild to the spare disk

takes place immediately.

The following criteria apply to the tests on which this information is based:

• The disk failure was simulated by pulling a disk from the array.

• The simulated load consists of eight clients writing files of 4GB repeatedly in 4MB chunks over a

high-performance interconnect.

• The clients wrote to the affected LUN only.

• Tests were carried out with the RAID rebuild priority set to medium and high.

(This parameter is set when the array is configured, using the rebuild_priority option with the

configure array command.)

Tests were carried out on arrays containing 250GB disks and 500GB disks. For 160GB disks, the

corresponding times could be estimated from the times shown for 250GB disks, as follows:

Time shown/25*16

Table D-1 shows the time taken to rebuild to the spare disk (Failover) and from the spare disk to the

replacement disk (Failback) on disks with various configurations. The MB/sec numbers represent the

performance that was delivered to the application writing the data.

Table D-1 Rebuilding to and from the spare disk

Disk Size Redundancy

Type

Rebuild

Priority

Failover Failback

Time (Hours) MB/sec Time (Hours) MB/sec

250RAID5Medium 1632632

250 RAID5 High 3 4 2 (Approx) 9

250ADGMedium 1226626

250 ADG High 5.5 4 2 4

500 ADG Medium 63.5 40 9 44

500 ADG High 13.5 11 3.5 11

1 2 ... 345 346 347 348 349 350 351 352 353 354 355 ... 361 362

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Hp StorageWorks Scalable File Share Uživatelský manuál Strana 350