Gluster users - Oct 2024 - How much disk can fail after a catastrophic failure occur?

If it's replica 2, you can loose up to 1 replica per distribution group.For
example, if you have a volume TEST with such setup:

server1:/brick1
server2:/brick1
server1:/brick2
server2:/brick2

You can loose any brick of the replica "/brick1" and any brick in the
replica "/brick2". So if you loose server1:/brick1 and server2:/brick2
-> no data loss will be experienced.
As usual, consider if you can add an arbiter for your volumes.

Best Regards,
Strahil Nikolov

    ? ??????, 19 ???????? 2024 ?. ? 18:32:40 ?. ???????+3, Gilberto Ferreira
<gilberto.nunes32 at gmail.com> ??????:
 
 Hi there.I have 2 servers with this number of disks in each side:
pve01:~# df | grep disco
/dev/sdd ? ? ? ? ?1.0T ?9.4G 1015G ? 1% /disco1TB-0
/dev/sdh ? ? ? ? ?1.0T ?9.3G 1015G ? 1% /disco1TB-3
/dev/sde ? ? ? ? ?1.0T ?9.5G 1015G ? 1% /disco1TB-1
/dev/sdf ? ? ? ? ?1.0T ?9.4G 1015G ? 1% /disco1TB-2
/dev/sdg ? ? ? ? ?2.0T ? 19G ?2.0T ? 1% /disco2TB-1
/dev/sdc ? ? ? ? ?2.0T ? 19G ?2.0T ? 1% /disco2TB-0
/dev/sdj ? ? ? ? ?1.0T ?9.2G 1015G ? 1% /disco1TB-4
I have a?Type: Distributed-Replicate glusterSo my question is: how much disk can
be in fail state after losing data or something?
Thanks in advance
---

Gilberto Nunes Ferreira
?








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Ok! I got it about how many disks I can lose and so on.
But regard the arbiter isse, I always set this parameters in the gluster
volume, in order to avoid split-brain and I might add that work pretty well
to me.
I already have a Proxmox VE cluster with 2 nodes and about 50 vms, running
different Linux distro - and Windows as well - with Cpanel and other stuff,
in production.
Anyway here the parameters I had have used:

gluster vol set VMS cluster.heal-timeout 5
gluster vol heal VMS enable
gluster vol set VMS cluster.quorum-reads false
gluster vol set VMS cluster.quorum-count 1
gluster vol set VMS network.ping-timeout 2
gluster vol set VMS cluster.favorite-child-policy mtime
gluster vol heal VMS granular-entry-heal enable
gluster vol set VMS cluster.data-self-heal-algorithm full
gluster vol set VMS features.shard on
gluster vol set VMS performance.write-behind off
gluster vol set VMS performance.flush-behind off


---


Gilberto Nunes Ferreira






Em dom., 20 de out. de 2024 ?s 17:34, Strahil Nikolov <hunter86_bg at
yahoo.com>
escreveu:
> If it's replica 2, you can loose up to 1 replica per distribution
group.
> For example, if you have a volume TEST with such setup:
>
> server1:/brick1
> server2:/brick1
> server1:/brick2
> server2:/brick2
>
> You can loose any brick of the replica "/brick1" and any brick in
the
> replica "/brick2". So if you loose server1:/brick1 and
server2:/brick2 ->
> no data loss will be experienced.
> As usual, consider if you can add an arbiter for your volumes.
>
> Best Regards,
> Strahil Nikolov
>
> ? ??????, 19 ???????? 2024 ?. ? 18:32:40 ?. ???????+3, Gilberto Ferreira
<
> gilberto.nunes32 at gmail.com> ??????:
>
>
> Hi there.
> I have 2 servers with this number of disks in each side:
>
> pve01:~# df | grep disco
> /dev/sdd          1.0T  9.4G 1015G   1% /disco1TB-0
> /dev/sdh          1.0T  9.3G 1015G   1% /disco1TB-3
> /dev/sde          1.0T  9.5G 1015G   1% /disco1TB-1
> /dev/sdf          1.0T  9.4G 1015G   1% /disco1TB-2
> /dev/sdg          2.0T   19G  2.0T   1% /disco2TB-1
> /dev/sdc          2.0T   19G  2.0T   1% /disco2TB-0
> /dev/sdj          1.0T  9.2G 1015G   1% /disco1TB-4
>
> I have a Type: Distributed-Replicate gluster
> So my question is: how much disk can be in fail state after losing data or
> something?
>
> Thanks in advance
>
> ---
>
>
> Gilberto Nunes Ferreira
>
>
>
>
>
>
> ________
>
>
>
> Community Meeting Calendar:
>
> Schedule -
> Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC
> Bridge: https://meet.google.com/cpu-eiue-hvk
> Gluster-users mailing list
> Gluster-users at gluster.org
> https://lists.gluster.org/mailman/listinfo/gluster-users
>
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