[Gluster-users] DRBD with gluser

[Pablo Godel]

I am also interested in this scenario.

Pablo


On Mon, Aug 31, 2009 at 2:35 AM, Ran <smtp.test61 at gmail.com> wrote:

> Hello ,
> Im tring to set up gluster volume but to use drbd to replicate 2
> vloumes insted of using the AFR translator , it took me 1 hour to
> realize that the AFR is not stable for the following resones :
>
> in the example i tested 2 servers in AFR and distribute only 1 AFR
> (possible add more but just test with 1 AFR volume)
>
> volume vo1
>  type cluster/afr
> #  option data-self-heal off
> #  option   metadata-self-heal off
> #  option   entry-self-heal  off
>  subvolumes storage1 storage2
> end-volume
>
> volume cluster
>  type cluster/distribute
>  option lookup-unhashed yes
>  subvolumes vo1
> end-volume
>
> - all workimg ok , then if node 1 is rebooed node 2 takes its place
> and start serving KVM images ok also
> but when node 1 comes back from reboot the KVM images is locked by server 2
> and the data is not replicated back to server 1
> i read the gluster papers regarding this issue with opened files that
> were opened when the otehr member of the AFR is not online and its a
> big issue seens
> if server 1 just reboot for a minut then all replication is no good anymore
>
> So i guues in this stage and limitation its better be called 1 way
> replication with limitations and not proof for production use .
>
> In any case i decided to do the redundency of server 1 and 2 with DRBD
> wich is very stable and use gluster for its better abilities such as
> option of growing the file system in the future if needed and the
> client fail safe to other member node if 1 member is not online insted
> of using linux HA(heatbeat)
>
> I tested few client VOL configs and noticed that its not quite simple
>
> If i ommit the AFR translator and use only
>
> volume cluster
>  type cluster/distribute
>  option lookup-unhashed yes
>  subvolumes storage1 storage2
> end-volume
>
> with or without option lookup-unhashed yes
> then after a while every file show up 2 times in the mount point
> and its also not clear how the distribute will work on 2 DRBD(same volumes)
>
> Is there any way to implement this aka AFR translator that doesnt
> replicate at all e.g just bond the 2 nodes to 1 volume for load
> balanced and distribute perposes .
>
> I realy like gluster for its simplicity and if will be implemnted
> right and will work ok too then its much better then other file
> systems in that category like lustre for my needs anyway .
>
> sorry for my english .
>
> Rob .
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