Is TRIM working with gmirror?

[Steven Hartland]

----- Original Message ----- 
From: "Steven Hartland" <killing at multiplay.co.uk>

> ----- Original Message ----- 
> From: "Miroslav Lachman" <000.fbsd at quip.cz>
> 
>> 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.

    Regards
    Steve

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