zfs receive stalls whole system
Fabian Keil
freebsd-listen at fabiankeil.de
Thu May 26 11:08:47 UTC 2016
Fabian Keil <freebsd-listen at fabiankeil.de> wrote:
> rainer at ultra-secure.de wrote:
>
> > Am 2016-05-17 10:27, schrieb Fabian Keil:
> > > Rainer Duffner <rainer at ultra-secure.de> wrote:
> > >
> > >> I have two servers, that were running FreeBSD 10.1-AMD64 for a long
> > >> time, one zfs-sending to the other (via zxfer). Both are NFS-servers
> > >> and MySQL-slaves, the sender is actively used as NFS-server, the
> > >> recipient is just a warm-standby, in case something serious happens
> > >> and we don’t want to wait for a day until the restore is back in
> > >> place. The MySQL-Slaves are actively used as read-only servers (at the
> > >> application level, Python’s SQL-Alchemy does that, apparently).
> > >>
> > >> They are HP DL380G8 (one CPU, hexacore) with over 128 GB RAM (I think
> > >> one has 144, the other has 192).
> > >> While they were running 10.1, they used HP P420 RAID-controllers with
> > >> individual 12 RAID0 volumes that I pooled into 6-disk RAIDZ2 vdevs.
> > >> I use zfsnap to do hourly, daily and weekly snapshots.
> > > [...]
> > >> Now, when I do a zxfer, sometimes the whole system stalls while the
> > >> data is sent over, especially if the delta is large or if something
> > >> else is reading from the disk at the same time (backup agent).
> > >>
> > >> I had this before, on 10.0 (I believe, we didn’t have this in 9.1
> > >> either, IIRC) and it went away in 10.1.
> > >
> > > Do you use geli for swap device(s)?
> >
> >
> > Yes, I do.
> > /dev/mirror/swap.eli none swap sw 0 0
> >
> > Bad idea?
>
> It can cause deadlocks and poor performance when paging.
>
> This was recently fixed in ElectroBSD and I intend to submit
> the patch in a couple of days after a bit more stress testing.
Done: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209759
Fabian
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