IBM N Series, Implementation Manual

Page: 58 / 105

44 Planning for moving a disk shelf
Impact on clients of
moving a disk shelf
The following table shows the impact on clients of moving a disk shelf.
Importance of
understanding
aggregate layout
Before moving a disk shelf from an N series storage system to a gateway you
need to understand how the aggregates have been laid out, for the following
reasons:
◆
You must know which disks are in which aggregate so that you know which
disks to assign to your gateway.
◆
If an aggregate spans shelves, you cannot split the aggregate.
For users of this
protocol...
The impact is...
CIFS Shares to the moved data need to be created and the
UNC path will likely change.
NFS Volumes need to be exported on the new system with a
new path. Users must remount to the new location.
iSCSI igroups need to be created on the new system and the
array LUNs mapped to them. New iSCSI sessions
must be established from the hosts.
If you... Then...
Want to preserve the data in the
aggregate for use on the gateway You must move all the shelves to
the gateway that the aggregate
spans. (See “
Requirements if you
want to preserve data on the disk
shelf
” on page 45.)
Want to preserve the data for use
on the N series storage system Move the entire aggregate onto disk
shelves that will remain on the N
series storage system
Do not want to preserve the data Destroy the aggregate, then move
the desired number of disk shelves
to the gateway.