Re: Possible bug in thin metadata size with Linux MDRAID

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On 20/03/2017 12:01, Zdenek Kabelac wrote:


As said - please try with HEAD - and report back if you still see a
problem.
There were couple issue fixed along this path.


Ok, I tried now with tools and library from git:

LVM version:     2.02.169(2)-git (2016-11-30)
Library version: 1.02.138-git (2016-11-30)
Driver version:  4.34.0

I can confirm that now thin chunk size is no more bound (by default) by MD RAID chunk. For example, having created a ~500 GB MD RAID 10 array with 64 KB chunks, creating a thinpool shows that:

[root@blackhole ~]# lvcreate --thinpool vg_kvm/thinpool -L 500G
[root@blackhole ~]# lvs -a -o +chunk_size
  WARNING: Failed to connect to lvmetad. Falling back to device scanning.
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Chunk [lvol0_pmspare] vg_kvm ewi------- 128.00m 0 thinpool vg_kvm twi-a-tz-- 500.00g 0.00 0.42 256.00k [thinpool_tdata] vg_kvm Twi-ao---- 500.00g 0 [thinpool_tmeta] vg_kvm ewi-ao---- 128.00m 0 root vg_system -wi-ao---- 50.00g 0
  swap             vg_system -wi-a-----   7.62g

Should I open a bug against the RHEL-provided packages?
Thanks.

--
Danti Gionatan
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Assyoma S.r.l. - www.assyoma.it
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