On Jun 16, 2006, at 11:40 PM, Richard Elling wrote:
Kimberly Chang wrote:
A couple of ZFS questions:
1. ZFS dynamic striping will automatically use new added devices
when there are write requests. Customer has a *mostly read-only*
application with I/O bottleneck, they wonder if there is a ZFS
command or mechanism to enable the manual rebalancing of ZFS data
when adding new drives to an existing pool?
cp :-)
If you copy the file then the new writes will be spread across the
newly
added drives. It doesn't really matter how you do the copy, though.
She raises an interesting point, though.
The concept of shifting blocks in a zpool around in the background as
part of a scrubbing process and/or on the order of a explicit command
to populate newly added devices seems like it could be right up ZFS's
alley. Perhaps it could also be done with volume-level granularity.
Off the top of my head, an area where this would be useful is
performance management - e.g. relieving load on a particular FC
interconnect or an overburdened RAID array controller/cache thus
allowing total no-downtime-to-cp-data-around flexibility when one is
horizontally scaling storage performance.
/dale
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