One thing I'd like to see and I know we discussed that with Loïc a while ago is ceph-disk being idempotent when it comes to the device preparation. Running "ceph-disk prepare" against a device should result in an exit 0 if the disk already has an OSD prepared on it (unless we do something like --force, which will then zap the disk). I had to implement this logic in ceph-ansible (and the guys from chef/puppet probably did the same), so now it's done but i'll be happy to leave ceph-disk doing it :). Thoughts? On Thu, Apr 7, 2016 at 11:26 AM, Lars Marowsky-Bree <lmb@xxxxxxxx> wrote: > On 2016-04-02T07:54:05, Wido den Hollander <wido@xxxxxxxx> wrote: > >> >> > Op 1 april 2016 om 17:36 schreef Sage Weil <sweil@xxxxxxxxxx>: >> > >> > >> > Hi all, >> > >> > There are a couple of looming features for ceph-disk: >> > >> > 1- Support for additional devices when using BlueStore. There can be up >> > to three: the main device, a WAL/journal device (small, ~128MB, ideally >> > NVRAM), and a fast metadata device (as big as you have available; will be >> > used for internal metadata). >> > >> > 2- Support for setting up dm-cache, bcache, and/or FlashCache underneath >> > filestore or bluestore. >> > >> >> Keep in mind that you can't create a partition on a bcache device. So when using >> bcache, the journal has to be filebased and not a partition. > > Is there a point to running the journal on bcache? I see a point for > bcache for the (potentially on HDD) actual data store - but the > WAL/journal, would that not be directly on NVMe/PM/SSD (at the very > least)? Without an intervening cache? > > > Regards, > Lars > > -- > Architect SDS, Distinguished Engineer > SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) > "Experience is the name everyone gives to their mistakes." -- Oscar Wilde > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Cheers –––––– Sébastien Han Senior Cloud Architect "Always give 100%. Unless you're giving blood." Mail: seb@xxxxxxxxxx Address: 11 bis, rue Roquépine - 75008 Paris -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
