[Gluster-users] GlusterFS as virtual machine storage

[Ivan Rossi]

The latter one is the one I have been referring to. And it is pretty
dangerous Imho

Il 31/ago/2017 01:19, <lemonnierk at ulrar.net> ha scritto:

> Solved as to 3.7.12. The only bug left is when adding new bricks to
> create a new replica set, now sure where we are now on that bug but
> that's not a common operation (well, at least for me).
>
> On Wed, Aug 30, 2017 at 05:07:44PM +0200, Ivan Rossi wrote:
> > There has ben a bug associated to sharding that led to VM corruption that
> > has been around for a long time (difficult to reproduce I understood). I
> > have not seen reports on that for some time after the last fix, so
> > hopefully now VM hosting is stable.
> >
> > 2017-08-30 3:57 GMT+02:00 Everton Brogliatto <brogliatto at gmail.com>:
> >
> > > Ciao Gionatan,
> > >
> > > I run Gluster 3.10.x (Replica 3 arbiter or 2 + 1 arbiter) to provide
> > > storage for oVirt 4.x and I have had no major issues so far.
> > > I have done online upgrades a couple of times, power losses,
> maintenance,
> > > etc with no issues. Overall, it is very resilient.
> > >
> > > Important thing to keep in mind is your network, I run the Gluster
> nodes
> > > on a redundant network using bonding mode 1 and I have performed
> > > maintenance on my switches, bringing one of them off-line at a time
> without
> > > causing problems in my Gluster setup or in my running VMs.
> > > Gluster recommendation is to enable jumbo frames across the
> > > subnet/servers/switches you use for Gluster operations. Your switches
> must
> > > support MTU 9000 + 208 at least.
> > >
> > > There were two occasions where I purposely caused a split brain
> situation
> > > and I was able to heal the files manually.
> > >
> > > Volume performance tuning can make a significant difference in
> Gluster. As
> > > others have mentioned previously, sharding is recommended when running
> VMs
> > > as it will split big files in smaller pieces, making it easier for the
> > > healing to occur.
> > > When you enable sharding, the default sharding block size is 4MB which
> > > will significantly reduce your writing speeds. oVirt recommends the
> shard
> > > block size to be 512MB.
> > > The volume options you are looking here are:
> > > features.shard on
> > > features.shard-block-size 512MB
> > >
> > > I had an experimental setup in replica 2 using an older version of
> Gluster
> > > few years ago and it was unstable, corrupt data and crashed many
> times. Do
> > > not use replica 2. As others have already said, minimum is replica 2+1
> > > arbiter.
> > >
> > > If you have any questions that I perhaps can help with, drop me an
> email.
> > >
> > >
> > > Regards,
> > > Everton Brogliatto
> > >
> > >
> > > On Sat, Aug 26, 2017 at 1:40 PM, Gionatan Danti <g.danti at assyoma.it>
> > > wrote:
> > >
> > >> Il 26-08-2017 07:38 Gionatan Danti ha scritto:
> > >>
> > >>> I'll surely give a look at the documentation. I have the "bad" habit
> > >>> of not putting into production anything I know how to repair/cope
> > >>> with.
> > >>>
> > >>> Thanks.
> > >>>
> > >>
> > >> Mmmm, this should read as:
> > >>
> > >> "I have the "bad" habit of not putting into production anything I do
> NOT
> > >> know how to repair/cope with"
> > >>
> > >> Really :D
> > >>
> > >>
> > >> Thanks.
> > >>
> > >> --
> > >> Danti Gionatan
> > >> Supporto Tecnico
> > >> Assyoma S.r.l. - www.assyoma.it
> > >> email: g.danti at assyoma.it - info at assyoma.it
> > >> GPG public key ID: FF5F32A8
> > >> _______________________________________________
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> > >> Gluster-users at gluster.org
> > >> http://lists.gluster.org/mailman/listinfo/gluster-users
> > >>
> > >
> > >
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