Digital Equipment Corporation RAID Array 3000 storage subsystem Guide de l'utilisateur Page 38

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RAID Array 3000 Pedestal Enclosure
2–10 EK–SMCPO–UG. A01
2.6 RAID Levels Supported
The RAID Array 3000 controller supports the following RAID levels:
Table 2–3 RAID Levels Supported
RAID Level Description
0 Striping without parity
1 Mirroring
0+1 Striping and mirroring
4 Striping with fixed parity drive
5 Striping with floating parity drive
JBOD “Just a Bunch of Drives”
NOTE
The controller stripes data in multi-block chunk
sizes. Also, the controller does not support RAID
level 3 or 0 with a one-block chunk size.
There are some restrictions you must adhere to when creating a RAID set on the
RAID 3000 pedestal. The minimum and maximum number of drives required to
support each RAID level is listed in Table 2–4.
Table 2–4 Pedestal RAID Set Restrictions
RAID Level Min. No.
1
of
Drives
Max. No.
1
of
Drives
JBOD 1 1
02 56
12 56
0+1 4 16
43 56
53 56
1
Must be even number.
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