So, in oVirt if I want a single storage, without high availability, what is the 
best solution? 
Can I use gluster replica 1 for a single storage? 

by the way, cluster.min-free-disk: 1% not 10% the default value. And I still 
cannot remove the disk. 
I think I will destroy the volume and configure it again. 

Thanks 

José 


De: "Strahil Nikolov" <hunter86...@yahoo.com> 
Para: supo...@logicworks.pt 
Cc: "users" <users@ovirt.org> 
Enviadas: Terça-feira, 27 De Outubro de 2020 17:11:14 
Assunto: Re: [ovirt-users] Re: Gluster Domain Storage full 

Nope, 

oficially oVirt supports only replica 3 (replica 3 arbiter 1) or replica 1 
(which actually is a single brick distributed ) volumes. 
If you have issues related to the Gluster Volume - liek this case , the 
community support will be "best effort". 

Best Regards, 
Strahil Nikolov 






В вторник, 27 октомври 2020 г., 18:24:07 Гринуич+2, <supo...@logicworks.pt> 
написа: 





But there are also distributed volume types, right? 
Replicated is if you want high availability, that is not the case. 

Thanks 

José 

________________________________ 
De: "Strahil Nikolov" <hunter86...@yahoo.com> 
Para: supo...@logicworks.pt 
Cc: "users" <users@ovirt.org> 
Enviadas: Terça-feira, 27 De Outubro de 2020 15:49:22 
Assunto: Re: [ovirt-users] Re: Gluster Domain Storage full 

You have exactly 90% used space. 
The Gluster's default protection value is exactly 10%: 


Option: cluster.min-free-disk 
Default Value: 10% 
Description: Percentage/Size of disk space, after which the process starts 
balancing out the cluster, and logs will appear in log files 

I would recommend you to temporarily drop that value till you do the cleanup. 

gluster volume set data cluster.min-free-disk 5% 

To restore the default values of any option: 
gluster volume reset data cluster.min-free-disk 


P.S.: Keep in mind that if you have sparse disks for your VMs , they will be 
unpaused and start eating the last space you got left ... so be quick :) 

P.S.2: I hope you know that the only supported volume types are 
'distributed-replicated' and 'replicated' :) 

Best Regards, 
Strahil Nikolov 








В вторник, 27 октомври 2020 г., 11:02:10 Гринуич+2, supo...@logicworks.pt 
<supo...@logicworks.pt> написа: 





This is a simple installation with one storage, 3 hosts. One volume with 2 
bricks, the second brick was to get more space to try to remove the disk, but 
without success 

]# df -h 
Filesystem Size Used Avail Use% Mounted on 
/dev/md127 50G 2.5G 48G 5% / 
devtmpfs 7.7G 0 7.7G 0% /dev 
tmpfs 7.7G 16K 7.7G 1% /dev/shm 
tmpfs 7.7G 98M 7.6G 2% /run 
tmpfs 7.7G 0 7.7G 0% /sys/fs/cgroup 
/dev/md126 1016M 194M 822M 20% /boot 
/dev/md125 411G 407G 4.1G 100% /home 
gfs2.domain.com:/data 461G 414G 48G 90% 
/rhev/data-center/mnt/glusterSD/gfs2.domain.com:_data 
tmpfs 1.6G 0 1.6G 0% /run/user/0 


# gluster volume status data 
Status of volume: data 
Gluster process TCP Port RDMA Port Online Pid 
------------------------------------------------------------------------------ 
Brick gfs2.domain.com:/home/brick1 49154 0 Y 8908 
Brick gfs2.domain.com:/brickx 49155 0 Y 8931 

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

# gluster volume info data 

Volume Name: data 
Type: Distribute 
Volume ID: 2d3ea533-aca3-41c4-8cb6-239fe4f82bc3 
Status: Started 
Snapshot Count: 0 
Number of Bricks: 2 
Transport-type: tcp 
Bricks: 
Brick1: gfs2.domain.com:/home/brick1 
Brick2: gfs2.domain.com:/brickx 
Options Reconfigured: 
cluster.min-free-disk: 1% 
cluster.data-self-heal-algorithm: full 
performance.low-prio-threads: 32 
features.shard-block-size: 512MB 
features.shard: on 
storage.owner-gid: 36 
storage.owner-uid: 36 
transport.address-family: inet 
nfs.disable: on 

________________________________ 
De: "Strahil Nikolov" <hunter86...@yahoo.com> 
Para: supo...@logicworks.pt 
Cc: "users" <users@ovirt.org> 
Enviadas: Terça-feira, 27 De Outubro de 2020 1:00:08 
Assunto: Re: [ovirt-users] Re: Gluster Domain Storage full 

So what is the output of "df" agianst : 
- all bricks in the volume (all nodes) 
- on the mount point in /rhev/mnt/.... 

Usually adding a new brick (per host) in replica 3 volume should provide you 
more space. 
Also what is the status of the volume: 

gluster volume status <VOL> 
gluster volume info <VOL> 


Best Regards, 
Strahil Nikolov 






В четвъртък, 15 октомври 2020 г., 16:55:27 Гринуич+3, <supo...@logicworks.pt> 
написа: 





Hello, 

I just add a second brick to the volume. Now I have 10% free, but still cannot 
delete the disk. Still the same message: 

VDSM command DeleteImageGroupVDS failed: Could not remove all image's volumes: 
(u'b6165676-a6cd-48e2-8925-43ed49bc7f8e [Errno 28] No space left on device',) 

Any idea? 
Thanks 

José 

________________________________ 
De: "Strahil Nikolov" <hunter86...@yahoo.com> 
Para: supo...@logicworks.pt 
Cc: "users" <users@ovirt.org> 
Enviadas: Terça-feira, 22 De Setembro de 2020 13:36:27 
Assunto: Re: [ovirt-users] Re: Gluster Domain Storage full 

Any option to extend the Gluster Volume ? 

Other approaches are quite destructive. I guess , you can obtain the VM's xml 
via virsh and then copy the disks to another pure-KVM host. 
Then you can start the VM , while you are recovering from the situation. 

virsh -c qemu:///system?authfile=/etc/ovirt-hosted-engine/virsh_auth.conf 
dumpxml <VM_NAME> > /some/path/<VM_NAME>.xml 

Once you got the VM running on a pure-KVM host , you can go to oVirt and try to 
wipe the VM from the UI. 


Usually those 10% reserve is just in case something like this one has happened, 
but Gluster doesn't check it every second (or the overhead will be crazy). 

Maybe you can extend the Gluster volume temporarily , till you manage to move 
away the VM to a bigger storage. Then you can reduce the volume back to 
original size. 

Best Regards, 
Strahil Nikolov 



В вторник, 22 септември 2020 г., 14:53:53 Гринуич+3, supo...@logicworks.pt 
<supo...@logicworks.pt> написа: 





Hello Strahil, 

I just set cluster.min-free-disk to 1%: 
# gluster volume info data 

Volume Name: data 
Type: Distribute 
Volume ID: 2d3ea533-aca3-41c4-8cb6-239fe4f82bc3 
Status: Started 
Snapshot Count: 0 
Number of Bricks: 1 
Transport-type: tcp 
Bricks: 
Brick1: node2.domain.com:/home/brick1 
Options Reconfigured: 
cluster.min-free-disk: 1% 
cluster.data-self-heal-algorithm: full 
performance.low-prio-threads: 32 
features.shard-block-size: 512MB 
features.shard: on 
storage.owner-gid: 36 
storage.owner-uid: 36 
transport.address-family: inet 
nfs.disable: on 

But still get the same error: Error while executing action: Cannot move Virtual 
Disk. Low disk space on Storage Domain 
I restarted the glusterfs volume. 
But I can not do anything with the VM disk. 


I know that filling the bricks is very bad, we lost access to the VM. I think 
there should be a mechanism to prevent stopping the VM. 
we should continue to have access to the VM to free some space. 

If you have a VM with a Thin Provision disk, if the VM fills the entire disk, 
we got the same problem. 

Any idea? 

Thanks 

José 



________________________________ 
De: "Strahil Nikolov" <hunter86...@yahoo.com> 
Para: "users" <users@ovirt.org>, supo...@logicworks.pt 
Enviadas: Segunda-feira, 21 De Setembro de 2020 21:28:10 
Assunto: Re: [ovirt-users] Gluster Domain Storage full 

Usually gluster has a 10% reserver defined in 'cluster.min-free-disk' volume 
option. 
You can power off the VM , then set cluster.min-free-disk 
to 1% and immediately move any of the VM's disks to another storage domain. 

Keep in mind that filling your bricks is bad and if you eat that reserve , the 
only option would be to try to export the VM as OVA and then wipe from current 
storage and import in a bigger storage domain. 

Of course it would be more sensible to just expand the gluster volume (either 
scale-up the bricks -> add more disks, or scale-out -> adding more servers with 
disks on them), but I guess that is not an option - right ? 

Best Regards, 
Strahil Nikolov 








В понеделник, 21 септември 2020 г., 15:58:01 Гринуич+3, supo...@logicworks.pt 
<supo...@logicworks.pt> написа: 





Hello, 

I'm running oVirt Version 4.3.4.3-1.el7. 
I have a small GlusterFS Domain storage brick on a dedicated filesystem serving 
only one VM. 
The VM filled all the Domain storage. 
The Linux filesystem has 4.1G available and 100% used, the mounted brick has 
0GB available and 100% used 

I can not do anything with this disk, for example, if I try to move it to 
another Gluster Domain Storage get the message: 

Error while executing action: Cannot move Virtual Disk. Low disk space on 
Storage Domain 

Any idea? 

Thanks 

-- 
________________________________ 
Jose Ferradeira 
http://www.logicworks.pt 
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