Timothy Coalson wrote:
On Fri, Jan 16, 2015 at 11:47 AM, Andrew Gabriel <
[email protected]> wrote:
On 01/16/15 03:47 PM, Gary Gendel wrote:
On 01/16/2015 10:22 AM, Andrew Gabriel wrote:
On 01/16/15 02:37 PM, Gary Gendel wrote:
I thought about creating a new BE and then sending the current BE to
it, but there doesn't seem to be enough room.
Since rpool can only be either a single disk or a mirror, the easiest
way to defrag it is to attach another mirror side and let it resilver. The
new mirror side will be defragged. Make sure the new disk is bootable (has
grub etc on it), and then zpool split off the old disk. It would be a good
opportunity to move to a bigger rpool disk too.
Yes, this is the rpool and is mirrored. Would resilvering really
defragment it?
Yes, space is allocated afresh when resilvering (which is a significant
difference from traditional RAID).
I find that surprising. Does the metadata on the older drive(s) manage to
refer to the new, independent location of the blocks on the new mirror, and
if so, how?
Good question - I'm going to have to think about that.
I have done the mirror side attach and old side detach a few times and
got significantly better performing pool in the case of an old pool, but
maybe my rationale for the reason is not correct. I haven't done it
since the spacemap histograms were introduced, so I haven't seen if the
spacemap is significantly less fragmented as a result. Something to try out.
--
Andrew
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