Greg,
Would you mind sharing your insight about potential issue of
multiple FS? It looks to me like we can separate every component of
the cluster --- i.e , each FS has its own data pool ,meta pool, and
even the pools can be mapped to different osds. Seperate MDS nodes so
they dont compete for memory . The only sharing part is Monitor , so
seems it is simpler than the dir frag and very likely to work ?
As single MDS can only sustain 1~2 CPU cores and provide less
than 2000 TPS for most of the operation (tested with mds_log = false ,
which is the upper bound of performance. op including rename, utime,
open). So multi-fs is some kind of *must have* for one like to
provide FS service.
Xiaoxi
2016-06-30 1:53 GMT+08:00 Gregory Farnum <gfarnum@xxxxxxxxxx>:
> On Wed, Jun 29, 2016 at 10:47 AM, Radoslaw Zarzynski
> <rzarzynski@xxxxxxxxxxxx> wrote:
>> Hello,
>>
>> I saw the recent question about having more than 1 active
>> MDS in a cluster. I would like to ask similar ones but in
>> the matter of 1) directory fragmentation and 2) running
>> multiple filesystems within same cluster.
>>
>> When those features are expected to be production-ready?
>> What do we need to achieve this status?
>
> These are both all about the QA work of just making sure they're
> well-tested in the nightlies, and demonstrating that the functionality
> isn't broken. We're expecting dirfrags to be enabled in Kraken; I
> don't know if there's a target timeline around multi-fs.
>
> There are available tickets in the tracker that basically come out to
> "demonstrate dirfrags actually get exercised in the nightlies", etc if
> you're interested in contributing!
> -Greg
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