On 03/03/10 05:19, Matt Keenan wrote:
In a multipool environment, would be make sense to add swap to a pool outside or
the root pool, either as the sole swap dataset to be used or as extra swap ?
Yes. I do it routinely, primarily to preserve space on boot disks on
large-memory systems.
swap can go in any pool, while dump has the same limitations as root:
single top-level vdev, single-disk or mirrors only.
Would this have any performance implications ?
If the non-root pool has many spindles, random read I/O should be faster
and thus swap i/o should be faster. I haven't attempted to measure if
this makes a difference.
I generally set primarycache=metadata on swap zvols but I also haven't
been able to measure whether it makes any difference.
My users do complain when /tmp fills because there isn't sufficient swap
so I do know I need large amounts of swap on these systems. (when
migrating one such system from Nevada to Opensolaris recently I forgot
to add swap to /etc/vfstab).
- Bill
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