[zfs-discuss] ZFS eating up all 16 GB RAM when combining 4k blocksize ZVOL with XFS

Bzzzz lazyvirus at gmx.com
Tue Nov 13 14:12:42 EST 2018


On Tue, 13 Nov 2018 19:50:01 +0100
Omar Siam via zfs-discuss <zfs-discuss at list.zfsonlinux.org> wrote:

> First: That something is hidden. No easily accessible kernel or user 
> space stat shows it. So of course I can't point to what consumes all
> the RAM.

Hmm, what are your libaio, zfs and kernel versions and which distro do
you use ?

> Second: This happens only when writing using explicitly libaio. Data
> is written before that and there isn't anything remarkable. If I use 
> LIO/iSCSI from another machine with the same programs and XFS
> filesystem it works.

Did you carefully review all involved configuration files on both
machines, and are those hardwares identical ?

> If I use SCST the target machine with the ZVOL
> crashes at the same point, the second attempt to write to a file using
> 2MB chunks using libaio.

JY
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