Displaying 3 results from an estimated 3 matches for "cachedlv".
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2017 Apr 08
2
lvm cache + qemu-kvm stops working after about 20GB of writes
...) + software RAID 1 (2xSSD) and create
a cached LV out of them, the VM performs initially great (at least
40.000 IOPS on 4k rand read/write)! But then after a while (and a lot of
random IO, ca 10 - 20 G) it effectively turns in to a writethrough cache
although there's much space left on the cachedlv.
When working as expected on KVM host all writes go to SSDs
iostat -x -m 2
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 324.50 0.00 22.00 0.00 14.94
1390.57 1.90 86.39 0...
2017 Apr 10
0
lvm cache + qemu-kvm stops working after about 20GB of writes
...D 1 (2xSSD) and create a
> cached LV out of them, the VM performs initially great (at least 40.000
> IOPS on 4k rand read/write)! But then after a while (and a lot of random
> IO, ca 10 - 20 G) it effectively turns in to a writethrough cache although
> there's much space left on the cachedlv.
>
>
> When working as expected on KVM host all writes go to SSDs
>
> iostat -x -m 2
>
> Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz
> avgqu-sz await r_await w_await svctm %util
> sda 0.00 324.50 0.00 22.00 0.00...
2017 Apr 20
2
lvm cache + qemu-kvm stops working after about 20GB of writes
...create a cached LV out of them, the VM performs initially great
> (at least 40.000 IOPS on 4k rand read/write)! But then after a
> while (and a lot of random IO, ca 10 - 20 G) it effectively turns
> in to a writethrough cache although there's much space left on the
> cachedlv.
>
>
> When working as expected on KVM host all writes go to SSDs
>
> iostat -x -m 2
>
> Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
> avgrq-sz avgqu-sz await r_await w_await svctm %util
> sda 0.00 324.50 0.00...