On 04/19/17 07:42, gjprabu wrote: > Hi Shuresh, > > Thanks for your reply, Is it ok to have OS on normal SATA > hard drive, volume and journal on same SSD. Mainly we are asking this > suggestion for performance purpose. > For performance, it's always best to make it as parallel as possible.
The OS is probably pretty static... mostly logs are written. So it might not impact performance much... but how much is too much depends on your needs. It's up to you to decide to combine them. The best practice is not to. The mons don't need much IO, but it is said that a really huge scale should have them totally separate as they become a bottleneck, and at small scale the mon still doesn't need much IO, but what it uses will slow down an OSD it shares with. So a mon could easily share the OS disk, especially an SSD, on a small cluster. And in general, the OSD should always be completely separate. But it won't crash if you combine it, until it ends up so slow that it times out. Whether this is acceptable or not depends on your needs. And same with journals, but more significantly slower if you colocate the journal with the osd, except if it's all SSD, then it's more cost effective to have more SSD osds with colocated journals than having separate journals to go with them (because you won't use all the space on the journal, it's more costly relative to the benefit, also using up valuable disk bays). > Regards > Prabu GJ > > ---- On Wed, 19 Apr 2017 11:54:04 +0530 *Shuresh > <shur...@vikatan.com>* wrote ---- > > Hi Prabhu, > > You can use both the OS and OSD in single SSD. > > Regards > Shureshbabu > > On 19 April 2017 at 11:02, gjprabu <gjpr...@zohocorp.com > <mailto:gjpr...@zohocorp.com>> wrote: > > > Hi Team, > > Ceph OSD disk allocation procedure suggested that > "*We recommend using a dedicated drive for the operating > system and software, and one drive for each Ceph OSD Daemon > you run on the host*" We have only SSD hard disk and is it > advisable to run OS and OSD on the same disk. > > Regards > Prabu GJ > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com <mailto: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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