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IBM DS6000 Manual de usuario Pagina 166

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142 DS6000 Series: Concepts and Architecture
See Figure 8-10 and 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.
Figure 8-10 Sparing example 1 (RAID-5)
Sparing Example 1 – RAID 5:
All same capacity, same rpm
• 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
DA
1
6 + P
7 + P
2
6 + P
7 + P
…
Server Enclosure
DA
1
6 + P
7 + P
2
6 + P
7 + P
…
Exp Enclosure 1
Exp Enclosure 3
Exp Enclosure 2
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