+fuel-dev On Jan 17, 2014 6:42 PM, "Roman Sokolkov" <[email protected]> wrote:
> Andrey, > > are we able to use multiple block devices for journal purpose right now? > > Answer on your question is yes. I've checked it already. I've used 2 disks > for journal and 2 for OSD. Single journal disk mapped on single OSD disk in > this case. I assume if i will add additional (third) OSD disk, it will > remain without separate journal. Here is the > logic<https://github.com/stackforge/fuel-library/blob/master/deployment/puppet/ceph/lib/facter/ceph_osd.rb#L30> > . > > But the main question was: > > Is there ability to use one journal disk for multiple OSD disks? > > i.e. i have 4 SSDs and 20 HDDs in storage node. I want to use 1 SSD per 5 > HDD. In this case SSD should contain 5 partitions. > > Thanks, Roman S. > > > On Fri, Jan 17, 2014 at 6:31 PM, Andrey Korolev <[email protected]>wrote: > >> Hello, >> >> Services team came with a question about Ceph setup - are we able to use >> multiple block devices for journal purpose right now? >> >> Also I am reviving back the issue with journal placement - our current >> approach to slice journal device to the equal chunk is not very good in >> terms of possible reconfiguration - e.g. you can not add more OSD daemons >> without shutting down every daemon on the selected nodes, doing journal >> flush and repartitioning. Can we please switch to the filesystem-based >> journal placement in the next release? Passing 'discard' option to the >> filesystem we will be able to maintain same level of wearout and with fixed >> or proportional journal size (e.g. to not allocate all free space) we will >> achieve greater maintenance flexibility. >> > > > > -- > Best regards, Roman Sokolkov >
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