Steven Hartland wrote:
----- Original Message ----- From: "Steven Hartland"
<[email protected]>
----- Original Message ----- From: "Miroslav Lachman" <[email protected]>
Steven Hartland wrote:
[...]
Unless you have a specific reason for using gmirror I would strongly
advise trying ZFS instead, it will definitely support TRIM in that
config and comes with a host of other benefits too :)
The specific reason is performance and memory consumption. We need
every piece of performance and all memory to MySQL daemon, so this is
why gmirror was choosen.
We have ZFS on other purposes machines for years (from 7.x days), so
I can say "I have a lot of experiences" (good and bad too).
In some tests, ZFS is about 50% slower than UFS.
What about graid(8) mirror instead of gmirror(8)? Is there better
support for TRIM on UFS?
Actually looking at it gmirror should support delete no problem see
g_mirror_init_disk GEOM::candelete.
So you might want to add some debugging around there to see whats
happening.
Double checked this on HEAD and it definitely works as expected.
I am not able to understand C sources, so I cannot check it myself. But
if it is supported, why I see the warning message at boot?
Miroslav Lachman
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