Adding Disk Enclosures To Increase Capacity; General Rules For Adding Disk Enclosures To The Disk Array - HP Surestore Disk Array 12h - And FC60 Service Manual

Adding Disk Enclosures to Increase Capacity

Scalability is an important part of the design of the HP SureStore E Disk Array FC60. The
capacity of the disk array can be increased in a variety of ways to meet growing storage
needs. See "Adding Capacity to the Disk Array" on page 200
scalability options.
Adding disk array enclosure(s) is the most effective way of significantly increasing the
capacity of the disk array. It is also the most involved. The following procedure describes
the process of adding disk enclosures to the disk array configuration.
This procedure should be performed by properly trained personnel only.
Note

General Rules for Adding Disk Enclosures to the Disk Array

•
Shutting Down the Disk Array - Adding one or more new disk enclosures requires
powering off the entire disk array. This will make all data on the disk array unavailable
during the expansion process.
•
Backing Up Data -All data on the disk array should be backed up to prevent data loss
should problems occur during the expansion.
•
Maintaining High Availability - Adding disk enclosures will typically require that you
convert existing disk enclosures from split-bus configuration to full-bus configuration.
This may result in more than one disk in a volume group being on the same channel. This
will necessitate moving disks to other enclosures following the expansion. For optimum
high-availability, there should never be no more than one disk from a volume group on
each channel.
•
Moving Disk Modules - When moving disks during the expansion, it is recommended
that disks be moved to the enclosure and slot that correspond to the original channel:ID
of the disk. For example, if the disk was originally installed in the slot corresponding to
channel 4, ID 1, it should be moved to the slot that corresponds to the same values
following the expansion. Although disks can be moved to any slot, maintaining the same
channel:ID simplifies volume group management.
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