On 07/15/2015 05:48 PM, Gregor Burck wrote:
Hi,
I still testing glusterfs for use for storing of images from virtual
machines.
I start with 2 machines for stora and vm-host:
two machines:
gf001 and gf002
Both:
debian 8
glusterfs 3.7
/dev/sda - root
/dev/sdb - /export/vbstore
My volume info:
root@gf001 :~# gluster volume info vbstore
Volume Name: vbstore
Type: Replicate
Volume ID: 7bf8aa42-8fd9-4535-888d-dacea4f14a83
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: gf001.mvz.ffm:/export/vbstore
Brick2: gf002.mvz.ffm:/export/vbstore
mounting on gf001:
mount -t glusterfs gf001:/vbstore /import/vbstore
or via fstab:
gf001:/vbstore /import/vbstore glusterfs defaults 0 0
The same on gf002 with gf002 as server.
Creating an virtualbox VM in /import/vbstore.
Starting VM on gf001 OR gf002 work right.
After I learned, that if I restart an server, the filesystem go
readonly I add an additional brick:
gluster volume add-brick vbstore replica 3 edgf006:/export/vbstore
and set following Options:
cluster.quorum-count: 1
cluster.server-quorum-type: server
cluster.quorum-type: none
network.remote-dio: enable
cluster.eager-lock: enable
performance.stat-prefetch: off
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
performance.readdir-ahead: on
cluster.server-quorum-ratio: 51
When I restart gf004 or gf005 the virtualmachine got an error and made
filesystem readonly.
A glusterfs volume heal vbstore info give this:
Brick edgf004:/export/vbstore/
Number of entries: 0
Brick edgf005:/export/vbstore/
/gftest/gftest.vdi - Possibly undergoing heal
Number of entries: 1
Brick edgf006:/export/vbstore/
/gftest/gftest.vdi - Possibly undergoing heal
Number of entries: 1
My questions:
1. Which Options should I took for storing virtual images.
You can create a normal replica 3 volume and then use it for VM images,
instead of doing an add brick (thus avoiding the need to heal the vm
image file to the newly added brick). client quorm
(cluster.quorum-type) should be set to `auto`.
glusterfs 3.7 onwards has support for a special type of replica 3
configuration called arbiter volumes where the disk space consumed is
less than a conventional replica 3 volume . It would be great if you
can try that out for your VM images and provide some feedback! Details
on arbiter volumes can be found here:
https://github.com/gluster/glusterfs/blob/master/doc/features/afr-arbiter-volumes.md
2. How to reset all options, I think I've played a little bit to much.
gluster volume reset <VOLNAME> <option name>
Thanks,
Ravi
Bye
Gregor
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