Re: Can't heal a volume: "Please check if all brick processes are running."

[Karthik Subrahmanya <ksubrahm@xxxxxxxxxx>]

On Wed, Mar 14, 2018 at 5:42 PM, Karthik Subrahmanya <ksubrahm@xxxxxxxxxx> wrote:

On Wed, Mar 14, 2018 at 3:36 PM, Anatoliy Dmytriyev <tolid@xxxxxxxxxxxx> wrote:

Hi Karthik,

Thanks a lot for the explanation.

Does it mean a distributed volume health can be checked only by "gluster volume status " command?

Yes. I am not aware of any other command which can give the status of plain distribute volume which is similar to the heal info command for replicate/disperse volumes.

And one more question: cluster.min-free-disk is 10% by default. What kind of "side effects" can we face if this option will be reduced to, for example, 5%? Could you point to any best practice document(s)?

Yes you can decrease it to any value. There won't be any side effect.

Small correction here, min-free-disk should ideally be set to larger than the largest file size likely to be written. Decreasing it beyond a point raises the likelihood of the brick getting full which is a very bad state to be in.
Will update you if I get some document which explains this thing. Sorry for the previous statement.

Regards,

Karthik

Regards,

Anatoliy

On 2018-03-13 16:46, Karthik Subrahmanya wrote:

Hi Anatoliy,

The heal command is basically used to heal any mismatching contents between replica copies of the files.

For the command "gluster volume heal <volname>" to succeed, you should have the self-heal-daemon running,
which is true only if your volume is of type replicate/disperse.

In your case you have a plain distribute volume where you do not store the replica of any files.

So the volume heal will return you the error.

Regards,

Karthik

On Tue, Mar 13, 2018 at 7:53 PM, Anatoliy Dmytriyev <tolid@xxxxxxxxxxxx> wrote:

Hi,


Maybe someone can point me to a documentation or explain this? I can't find it myself.
Do we have any other useful resources except doc.gluster.org? As I see many gluster options are not described there or there are no explanation what is doing...

On 2018-03-12 15:58, Anatoliy Dmytriyev wrote:

Hello,

We have a very fresh gluster 3.10.10 installation.
Our volume is created as distributed volume, 9 bricks 96TB in total
(87TB after 10% of gluster disk space reservation)

For some reasons I can't "heal" the volume:
# gluster volume heal gv0
Launching heal operation to perform index self heal on volume gv0 has
been unsuccessful on bricks that are down. Please check if all brick
processes are running.

Which processes should be run on every brick for heal operation?

# gluster volume status
Status of volume: gv0
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Brick cn01-ib:/gfs/gv0/brick1/brick         0         49152      Y       70850
Brick cn02-ib:/gfs/gv0/brick1/brick         0         49152      Y       102951
Brick cn03-ib:/gfs/gv0/brick1/brick         0         49152      Y       57535
Brick cn04-ib:/gfs/gv0/brick1/brick         0         49152      Y       56676
Brick cn05-ib:/gfs/gv0/brick1/brick         0         49152      Y       56880
Brick cn06-ib:/gfs/gv0/brick1/brick         0         49152      Y       56889
Brick cn07-ib:/gfs/gv0/brick1/brick         0         49152      Y       56902
Brick cn08-ib:/gfs/gv0/brick1/brick         0         49152      Y       94920
Brick cn09-ib:/gfs/gv0/brick1/brick         0         49152      Y       56542

Task Status of Volume gv0
------------------------------------------------------------------------------
There are no active volume tasks


# gluster volume info gv0
Volume Name: gv0
Type: Distribute
Volume ID: 8becaf78-cf2d-4991-93bf-f2446688154f
Status: Started
Snapshot Count: 0
Number of Bricks: 9
Transport-type: rdma
Bricks:
Brick1: cn01-ib:/gfs/gv0/brick1/brick
Brick2: cn02-ib:/gfs/gv0/brick1/brick
Brick3: cn03-ib:/gfs/gv0/brick1/brick
Brick4: cn04-ib:/gfs/gv0/brick1/brick
Brick5: cn05-ib:/gfs/gv0/brick1/brick
Brick6: cn06-ib:/gfs/gv0/brick1/brick
Brick7: cn07-ib:/gfs/gv0/brick1/brick
Brick8: cn08-ib:/gfs/gv0/brick1/brick
Brick9: cn09-ib:/gfs/gv0/brick1/brick
Options Reconfigured:
client.event-threads: 8
performance.parallel-readdir: on
performance.readdir-ahead: on
cluster.nufa: on
nfs.disable: on

--
Best regards,
Anatoliy
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--

Best regards,
Anatoliy

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