[Gluster-users] Setup with replica 3 for imagestorage

Gregor Burck gregor at aeppelbroe.de
Wed Jul 15 12:18:34 UTC 2015


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

debian 8
glusterfs 3.7

/dev/sda - root
/dev/sdb - /export/vbstore

My volume info:
root at 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
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.
2. How to reset all options, I think I've played a little bit to much.



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