Re: glusterFS 3.6.2 migrate data by remove brick command

[Jiri Hoogeveen <j.hoogeveen@xxxxxxxxxxxxxxxx>]

Hi Sander,

• Since version 3.6 the remove brick command migrates the data away from the brick being removed, right?

It should :)

https://access.redhat.com/documentation/en-US/Red_Hat_Storage/3/pdf/Administration_Guide/Red_Hat_Storage-3-Administration_Guide-en-US.pdf page 100, is I think a good start.

I think this is the most complete documentation.

• When I have replicated bricks (replica 2), I also need to do "remove brick <volume> replica 2 brick1 brick2 …. , right?

Yes, you need to remove both replica’s at the same time.

Last but not least, is there any way to tell how long a “remove brick” will take when it’s moving the data? I have dual 10GB ethernet between the cluster members and the brick storage is a RAID-6 set which can read 400-600MB/sec without any problems.

Depends on the size of the disk, the number of files and type of file. Network speed is less a issu, then the IO on the disks/brick.

To migratie data from one disk to a other (is like self-healing) GlusterFS will do a scan of all files on the disk, which can cause a high IO on the disk.

Because you had also some performance issues, when you added some bricks, I will expect the same issue with remove brick. So do this at night if possible.

Grtz, Jiri

On 14 Apr 2015, at 12:53, Sander Zijlstra <sander.zijlstra@xxxxxxxxxxx> wrote:

LS,

I’m planning to decommission a few servers from my cluster, so to confirm:

• Since version 3.6 the remove brick command migrates the data away from the brick being removed, right?
• When I have replicated bricks (replica 2), I also need to do "remove brick <volume> replica 2 brick1 brick2 …. , right?

Last but not least, is there any way to tell how long a “remove brick” will take when it’s moving the data? I have dual 10GB ethernet between the cluster members and the brick storage is a RAID-6 set which can read 400-600MB/sec without any problems.

Met vriendelijke groet / kind regards,

Sander Zijlstra

| Linux Engineer | SURFsara | Science Park 140 | 1098XG Amsterdam | T +31 (0)6 43 99 12 47 | sander.zijlstra@xxxxxxxxxxx | www.surfsara.nl |

Regular day off on friday

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