Silicon Graphics InfiniteStorage 4000 Series, Настройка и обслуживание

Страница: 76 / 276

64 Configuring a Storage Array with Disk Pools
NOTE
Many of these commands require a thorough understanding of the firmware as
well as an understanding of the network components that need to be mapped. Use the
CLI commands and the script commands with caution.
Using the Create
Disk Pool Command
Use the
create diskPool
command to create a new disk pool in two ways:

Create a new disk pool automatically by entering the type of drives that you want
in the disk pool and the name that you want to assign to the disk pool, and then
letting the storage management software assign the drives.

Create a new disk pool manually by selecting and assigning drives to the disk
pool.
You must have unassigned drives in the storage array. You do not need to assign the
entire capacity of the storage array to the disk pool. You can mix both disk pools and
volume groups in a storage system.
When you create a new disk pool you want to assign the largest number of drives
possible to the disk pool. The more drives that you have in a disk pool, the more
robust the disk pool is, with faster rebuild times and simplified management
requirements. The minimum number of drives that you can have in a disk pool is 11;
the maximum number of drives is as many as required to support the maximum
number of volumes that a controller can manage. The maximum number of volumes
that an E2600 can support is 512; the maximum number of volumes that an E5400
can support is 2048. The following table shows the drive counts and the number of
drives reserved for reconstruction.
Table 12 Number of Drives in a Disk Pool to Support RAID 6
The only supported RAID level for a disk pool is RAID 6, with a stripe width of 10.
The storage array must have a minimum drive count to create a pool. The number of
drives in the pool also influences how much reserved capacity is needed to
redistribute data for rebuilds.
Drive Count
Drives
Reserved for
Reconstruction
Comments
11 1 Minimum number of drives in a disk pool
12 -31 2
32 - 63 3
64 - 127 4
128 - 191 6
192 - 255 7 Maximum E2600 configuration
256 - 384 8 Maximum E5400 configuration