On 20/06/2014 00:06, Erik Logtenberg wrote: > Hi Loic, > > That is a nice idea. And if I then use newfs against that replicated > cache pool, it'll work reliably?
It will not be limited by the erasure coded pool features, indeed. Cheers > > Kind regards, > > Erik. > > > On 06/19/2014 11:09 PM, Loic Dachary wrote: >> >> >> On 19/06/2014 22:51, Wido den Hollander wrote: >>> >>> >>> >>> >>>> Op 19 jun. 2014 om 16:10 heeft "Erik Logtenberg" >>>> <e...@logtenberg.eu> het volgende geschreven: >>>> >>>> Hi, >>>> >>>> Are erasure coded pools suitable for use with MDS? >>>> >>> >>> I don't think so. It does in-place updates of objects and that >>> doesn't work with EC pools. >> >> Hi Erik, >> >> This is correct. You can however set the replicated pool to be the >> cache of an erasure coded pool. >> >> https://ceph.com/docs/master/dev/cache-pool/ >> >> Cheers >> >>> >>> >>>> I tried to give it a go by creating two new pools like so: >>>> >>>> # ceph osd pool create ecdata 128 128 erasure # ceph osd pool >>>> create ecmetadata 128 128 erasure >>>> >>>> Then looked up their id's: >>>> >>>> # ceph osd lspools ..., 6 ecdata,7 ecmetadata >>>> >>>> # ceph mds newfs 7 6 --yes-i-really-mean-it >>>> >>>> But then when I start MDS, it crashes horribly. I did notice >>>> that MDS created a couple of objects in the ecmetadata pool: >>>> >>>> # rados ls -p ecmetadata mds0_sessionmap mds0_inotable >>>> 1.00000000.inode 200.00000000 mds_anchortable mds_snaptable >>>> 100.00000000.inode >>>> >>>> However it crashes immediately after. I started mds manually to >>>> try and see what's up: >>>> >>>> # ceph-mds -i 0 -d >>>> >>>> This spews out so much information that I saved it in a >>>> logfile, added as an attachment. >>>> >>>> Kind regards, >>>> >>>> Erik. <mds.log> >>>> _______________________________________________ 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 >>> >> -- Loïc Dachary, Artisan Logiciel Libre
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