Hi Vijay,
The architecture is based on replica 2 not on replica 3...yes it's better i will raise this issue in the Ovirt userlist...Thanks.
Thanks,
punit
On Mon, Aug 18, 2014 at 8:07 PM, Vijay Bellur <vbellur@xxxxxxxxxx> wrote:
On 08/18/2014 11:51 AM, Punit Dambiwal wrote:Yes, HW raid with replica 3 is not essential.
Hi Vijay,
Thanks for the updates..that means if we use replica=3...then there is
no need to user HW raid ??
How do you plan to have replica 3 with 8 bricks?
As i want to use it with Ovirt with HA....would you mind to let me know
how i can achieve this ??
I have some HA related concern about glusterfs with Ovirt...let say i
have 4 storage node with gluster bricks as below :-
1. 10.10.10.1 to 10.10.10.4 with 2 bricks each and i have distributed
replicated architecture...
2. Now attached this gluster storge to ovrit-engine with the followingmount point 10.10.10.2/vol1 <http://10.10.10.2/vol1>
3. In my cluster i have 3 hypervisior hosts (10.10.10.5 to 10.10.10.7)
SPM is on 10.10.10.5...
4. What happen if 10.10.10.2 will goes down.....can hypervisior host can
still access the storage ??
If mount has already happened, hypervisor hosts can still access storage. To provide HA for mount operation, you can use backup-volfile-server option as described in man for mount.glusterfs [1].I am not too familiar about the implications of SPM going down. Seems like this question is more appropriate for ovirt mailing lists.
5. What happen if SPM goes down ???
If storage & compute are on the same server, VM migration before a server goes offline would be necessary. A VM can continue to operate as long as the mount point on the compute node can reach other bricks that are online in a gluster volume. I would also recommend to test the implications of self-healing in your test setup after a failed node comes back online as the self-healing process can compete for compute cycles.
Note :- What happen for point 4 &5 ,If storage and Compute both working
on the same server.
-Vijay
[1] https://github.com/gluster/glusterfs/blob/master/doc/mount.glusterfs.8
<mailto:vbellur@xxxxxxxxxx>> wrote:
On 08/18/2014 09:11 AM, Punit Dambiwal wrote:
Hi Juan,
Understand...but if i am using replica=3 then ?? As using the HW
raid
with commodity HDD will be not good choice...and if i choose HW raid
with enterprise grade HDD then cost will be higher and then
there will
be no use to choose glusterfs for storage...
For replica 3, I don't think hardware RAID would be beneficial. HW
raid is recommended for replica 2 scenarios with gluster to provide
an additional degree of redundancy.
-Vijay
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