Basically what we're trying to figure out looks like what is being done here: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2017-September/020958.html
But instead of using LIBRADOS to store EMAILs directly into RADOS we're still using CEPHFS for it, just figuring out if it makes sense to separate them in different workloads. Regards, Webert Lima DevOps Engineer at MAV Tecnologia *Belo Horizonte - Brasil* *IRC NICK - WebertRLZ* On Fri, May 11, 2018 at 2:07 AM, Marc Roos <m.r...@f1-outsourcing.eu> wrote: > > > If I would like to use an erasurecode pool for a cephfs directory how > would I create these placement rules? > > > > > -----Original Message----- > From: David Turner [mailto:drakonst...@gmail.com] > Sent: vrijdag 11 mei 2018 1:54 > To: João Paulo Sacchetto Ribeiro Bastos > Cc: ceph-users@lists.ceph.com > Subject: Re: [ceph-users] howto: multiple ceph filesystems > > Another option you could do is to use a placement rule. You could create > a general pool for most data to go to and a special pool for specific > folders on the filesystem. Particularly I think of a pool for replica vs > EC vs flash for specific folders in the filesystem. > > If the pool and OSDs wasn't the main concern for multiple filesystems > and the mds servers are then you could have multiple active mds servers > and pin the metadata for the indexes to one of them while the rest is > served by the other active mds servers. > > I really haven't come across a need for multiple filesystems in ceph > with the type of granularity you can achieve with mds pinning, folder > placement rules, and cephx authentication to limit a user to a specific > subfolder. > > > On Thu, May 10, 2018, 5:10 PM João Paulo Sacchetto Ribeiro Bastos > <joaopaulos...@gmail.com> wrote: > > > Hey John, thanks for you answer. For sure the hardware robustness > will be nice enough. My true concern was actually the two FS ecosystem > coexistence. In fact I realized that we may not use this as well because > it may be represent a high overhead, despite the fact that it's a > experiental feature yet. > > On Thu, 10 May 2018 at 15:48 John Spray <jsp...@redhat.com> wrote: > > > On Thu, May 10, 2018 at 7:38 PM, João Paulo Sacchetto > Ribeiro > Bastos > <joaopaulos...@gmail.com> wrote: > > Hello guys, > > > > My company is about to rebuild its whole infrastructure, > so > I was called in > > order to help on the planning. We are essentially an > corporate mail > > provider, so we handle daily lots of clients using > dovecot > and roundcube and > > in order to do so we want to design a better plant of > our > cluster. Today, > > using Jewel, we have a single cephFS for both index and > mail > from dovecot, > > but we want to split it into an index_FS and a mail_FS > to > handle the > > workload a little better, is it profitable nowadays? > From my > research I > > realized that we will need data and metadata individual > pools for each FS > > such as a group of MDS for each of then, also. > > > > The one thing that really scares me about all of this > is: we > are planning to > > have four machines at full disposal to handle our MDS > instances. We started > > to think if an idea like the one below is valid, can > anybody > give a hint on > > this? We basically want to handle two MDS instances on > each > machine (one for > > each FS) and wonder if we'll be able to have them > swapping > between active > > and standby simultaneously without any trouble. > > > > index_FS: (active={machines 1 and 3}, standby={machines > 2 > and 4}) > > mail_FS: (active={machines 2 and 4}, standby={machines 1 > and > 3}) > > Nothing wrong with that setup, but remember that those > servers > are > going to have to be well-resourced enough to run all four > at > once > (when a failure occurs), so it might not matter very much > exactly > which servers are running which daemons. > > With a filesystem's MDS daemons (i.e. daemons with the same > standby_for_fscid setting), Ceph will activate whichever > daemon comes > up first, so if it's important to you to have particular > daemons > active then you would need to take care of that at the > point > you're > starting them up. > > John > > > > > Regards, > > -- > > > > João Paulo Sacchetto Ribeiro Bastos > > +55 31 99279-7092 > > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > -- > > > João Paulo Sacchetto Ribeiro Bastos > +55 31 99279-7092 > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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