[linux-lvm] thin pool and discards

[Zdenek Kabelac]

Dne 30.9.2014 v 15:26 Vasiliy Tolstov napsal(a):
> Hello. I'm try to check that discard are working. I have thin volume
> 1031 (used by virtual machine)
> I'm fill the disc and delete data, (fs ext4 with discard option) after
> that i manually run fstrim -v /
> but data on thin volume not reclaimed.
>
>    LV      VG   Attr       LSize   Pool Origin Data%  Move Log Cpy%Sync Convert
>    tp0     vg0  twi-a-tz-- 445.00g               0.00
>    373_153 vg1  Vwi---tz-k  20.00g tp1
>    375_151 vg1  Vwi---tz-k  40.00g tp1
>    529_217 vg1  Vwi---tz-k  40.00g tp1
>    531_221 vg1  Vwi---tz-k  20.00g tp1
>    533_219 vg1  Vwi---tz-k  40.00g tp1
>    577_305 vg1  Vwi---tz-k  40.00g tp1
>    581_309 vg1  Vwi---tz-k  40.00g tp1
>    583_307 vg1  Vwi---tz-k  20.00g tp1
>    tp1     vg1  twi-a-tz-- 445.00g               0.50
>    377_159 vg2  Vwi---tz-k  20.00g tp2
>    445_197 vg2  Vwi---tz-k  20.00g tp2
>    tp2     vg2  twi-a-tz-- 445.00g               0.25
>    1031    vg3  Vwi-aotz--  20.00g tp3          56.23
>    tp3     vg3  twi-a-tz-- 445.00g               2.53
>    tp4     vg4  twi-a-tz-- 445.00g               0.00
>    111     vg5  Vwi-aotz--  20.00g tp5           5.63
>    111_23  vg5  Vwi---tz-k  20.00g tp5  111
>    111_71  vg5  Vwi---tz-k  20.00g tp5  111
>    13      vg5  Vwi-aotz--  30.00g tp5           4.70
>    17      vg5  Vwi-aotz--  20.00g tp5          25.58
>    29      vg5  Vwi-a-tz--  20.00g tp5           0.00
>    31      vg5  Vwi-a-tz--  20.00g tp5           0.00
>    33      vg5  Vwi-a-tz--  20.00g tp5           0.00
>    35      vg5  Vwi-a-tz--  20.00g tp5           0.00
>    75      vg5  Vwi-aotz--  20.00g tp5          25.58
>    tp5     vg5  twi-a-tz-- 445.00g               2.92
>
> lvm - 2.02.106
> kernel 3.10
>

Kernel 3.10 is too old,
Please repeat the test with at least 3.16


Zdenek