I had similar question a while ago, maybe these you want to read. https://www.mail-archive.com/ceph-users@xxxxxxxxxxxxxx/msg46768.html https://www.mail-archive.com/ceph-users@xxxxxxxxxxxxxx/msg46799.html -----Original Message----- From: Satish Patel [mailto:satish.txt@xxxxxxxxx] Sent: vrijdag 20 juli 2018 13:00 To: Eugen Block Cc: ceph-users@xxxxxxxxxxxxxx Subject: Re: Converting to BlueStore, and external journal devices What is the use of LVM in blurstore, I have seen people using LVM but don't know why ? Sent from my iPhone > On Jul 19, 2018, at 10:00 AM, Eugen Block <eblock@xxxxxx> wrote: > > Hi, > > if you have SSDs for RocksDB, you should provide that in the command (--block.db $DEV), otherwise Ceph will use the one provided disk for all data and RocksDB/WAL. > Before you create that OSD you probably should check out the help page for that command, maybe there are more options you should be aware of, e.g. a separate WAL on NVMe. > > Regards, > Eugen > > > Zitat von Robert Stanford <rstanford8896@xxxxxxxxx>: > >> I am following the steps here: >> http://docs.ceph.com/docs/mimic/rados/operations/bluestore-migration/ >> >> The final step is: >> >> ceph-volume lvm create --bluestore --data $DEVICE --osd-id $ID >> >> >> I notice this command doesn't specify a device to use as the journal. >> Is it implied that BlueStore will use the same (OSD) device for the function? >> I don't think that's what I want (I have spinning disks for data, and >> SSDs for journals). Is there any reason *not* to specify which >> device to use for a journal, when creating an OSD with BlueStore capability? > > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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