* [linux-lvm] persistent value of tunables for dmsetup --target=cache ?
@ 2015-04-21 8:58 nikhil
2015-04-22 9:48 ` Zdenek Kabelac
0 siblings, 1 reply; 3+ messages in thread
From: nikhil @ 2015-04-21 8:58 UTC (permalink / raw)
To: linux-lvm
Hello,
how do I ensure that the tunable (for eg. dmsetup message vg02-jetcache_lv 0
write_promote_adjustment 0) will remain the same value even after reboot?
Seems like the tunables values reset to earlier values upon reboot of the
machine.
Help! :)
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [linux-lvm] persistent value of tunables for dmsetup --target=cache ?
2015-04-21 8:58 [linux-lvm] persistent value of tunables for dmsetup --target=cache ? nikhil
@ 2015-04-22 9:48 ` Zdenek Kabelac
2015-04-22 14:25 ` Mike Snitzer
0 siblings, 1 reply; 3+ messages in thread
From: Zdenek Kabelac @ 2015-04-22 9:48 UTC (permalink / raw)
To: LVM general discussion and development
Dne 21.4.2015 v 10:58 nikhil napsal(a):
> Hello,
>
> how do I ensure that the tunable (for eg. dmsetup message vg02-jetcache_lv 0
> write_promote_adjustment 0) will remain the same value even after reboot?
>
> Seems like the tunables values reset to earlier values upon reboot of the
> machine.
>
> Help! :)
By using them, when you create/load dm table for your cache target.
Zdenek
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [linux-lvm] persistent value of tunables for dmsetup --target=cache ?
2015-04-22 9:48 ` Zdenek Kabelac
@ 2015-04-22 14:25 ` Mike Snitzer
0 siblings, 0 replies; 3+ messages in thread
From: Mike Snitzer @ 2015-04-22 14:25 UTC (permalink / raw)
To: nikhil; +Cc: LVM general discussion and development
On Wed, Apr 22 2015 at 5:48am -0400,
Zdenek Kabelac <zkabelac@redhat.com> wrote:
> Dne 21.4.2015 v 10:58 nikhil napsal(a):
> >Hello,
> >
> >how do I ensure that the tunable (for eg. dmsetup message vg02-jetcache_lv 0
> >write_promote_adjustment 0) will remain the same value even after reboot?
> >
> >Seems like the tunables values reset to earlier values upon reboot of the
> >machine.
> >
> >Help! :)
>
>
> By using them, when you create/load dm table for your cache target.
Best to use lvm2 to create/configure/tune dm-cache. Otherwise, if
you're just using the dmsetup interface directly you won't have your
tunings persist.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-04-22 14:25 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2015-04-21 8:58 [linux-lvm] persistent value of tunables for dmsetup --target=cache ? nikhil
2015-04-22 9:48 ` Zdenek Kabelac
2015-04-22 14:25 ` Mike Snitzer
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