Re: Automount Failovered Multi MDS CephFS

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On Wed, Aug 3, 2016 at 5:24 PM, Lazuardi Nasution
<mrxlazuardin@xxxxxxxxx> wrote:
> Hi John,
>
> If I have multi MON, should I put all MON IPs on /etc/fstab?

Yes, you put all your mons in your /etc/fstab entry.

> Is there any
> way to overcome MDS metadata bottleneck when only single MDS active?

Nope, you're going to have to wait for a future release that has
stable multi-MDS.

> In case on loadbalanced file/web servers, which one is better, each server
> mount to other replicated/distributed FS (for example via GlusterFS) on top
> of CephFS (different directory) or just directly mounts the same directory
> of CephFS?

You *definitely* don't want to layer another distributed filesystem on
top of cephfs.  If you're going to use CephFS, you mount it directly
on the client nodes where you want to use it.

John

>
> Best regards,
>
> On Wed, Aug 3, 2016 at 11:14 PM, John Spray <jspray@xxxxxxxxxx> wrote:
>>
>> On Wed, Aug 3, 2016 at 5:10 PM, Lazuardi Nasution
>> <mrxlazuardin@xxxxxxxxx> wrote:
>> > Hi,
>> >
>> > I'm looking for example about what to put on /etc/fstab if I want to
>> > auto
>> > mount CephFS on failovered multi MDS (only one MDS is active) especially
>> > with Jewel. My target is to build loadbalanced file/web servers with
>> > CephFS
>> > backend.
>>
>> The MDS configuration doesn't affect what you put in fstab, because
>> the addresses in fstab are just the mons (the client talks to the mons
>> to learn where to find the MDSs).
>>
>> So refer to the docs (http://docs.ceph.com/docs/master/cephfs/fstab/),
>> and if you have multiple monitors you put them in a comma separated
>> list.
>>
>> John
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