IBM DS6000 Series manual Sparing Example 1 RAID

See Figure 8-10and Figure 8-11 on page 143. These figures are simple examples for 64 DDM configurations with RAID 5 or RAID 10 arrays.

RAID arrays are configured with spare disks in the server enclosure and the first expansion enclosure (each enclosure has two spare disks). Expansion enclosures 2 and 3 don’t have spare disks.

Sparing Example 1 – RAID 5:

All same capacity, same rpm

Server Enclosure		Exp Enclosure 2
6 + P	6 + P	7 + P	7 + P
1				…
	2
DA
				DA
Exp Enclosure 1		Exp Enclosure 3
6 + P	6 + P	7 + P	7 + P
1				…
	2

•Assumes all devices same capacity & same rpm

•On a DS6800 will have up to two spares on each loop

–Additional RAID arrays will have no spares (RAID 5: 7+P, RAID 10: 4 x 2)

•All spares available to all arrays on the fabric

Figure 8-10 Sparing example 1 (RAID-5)

142DS6000 Series: Concepts and Architecture