----- Original Message -----> From: "Martin Toth" <snowmailer at gmail.com>
> To: "Nux!" <nux at li.nux.ro>
> Cc: "gluster-users" <gluster-users at gluster.org>,
"Gluster Devel" <gluster-devel at gluster.org>
> Sent: Monday, December 11, 2017 11:58:39 AM
> Subject: Re: [Gluster-users] How large the Arbiter node?
>
> Hi,
>
> there is good suggestion here :
>
docs.gluster.org/en/latest/Administrator Guide/arbiter-volumes-and-quorum/#arbiter-bricks-sizing
> Since the arbiter brick does not store file data, its disk usage will be
> considerably less than the other bricks of the replica. The sizing of the
> brick will depend on how many files you plan to store in the volume. A good
> estimate will be 4kb times the number of files in the replica.
You can see the explanation from the DEV here:
lists.gluster.org/pipermail/gluster-users/2016-March/025732.html
The 4k number was derived by adding 100 xattrs to a file:
[root at ravi4 brick]# touch file
[root at ravi4 brick]# ls -l file
-rw-r--r-- 1 root root 0 Mar 8 12:54 file
[root at ravi4 brick]# du file
*0 file**
*
[root at ravi4 brick]# for i in {1..100}
> do
> setfattr -n user.value$i -v value$i file
> done
[root at ravi4 brick]# ll -l file
-rw-r--r-- 1 root root 0 Mar 8 12:54 file
[root at ravi4 brick]# du -h file
*4.0K file**
The 4k number may be a little conservative but in all of the clusters I help
architect I follow that rule.
HTH!
-b
>
> BR,
>
> Martin
>
>
>
>
> On 11 Dec 2017, at 17:43, Nux! < nux at li.nux.ro > wrote:
>
> Hi,
>
> I see gluster now recommends the use of an arbiter brick in "replica
2"
> situations.
> How large should this brick be? I understand only metadata is to be stored.
> Let's say total storage usage will be 5TB of mixed size files. How
large
> should such a brick be?
>
> --
> Sent from the Delta quadrant using Borg technology!
>
> Nux!
> nux.ro
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