Re: [ceph-users] Testing a node by fio - strange results to me
Hi Udo, thanks for reply, I thought already that my message was missed the list. Not sure if understand correctly. Do you mean "rbd cache = true"? If yes, then this is RBD client cache behavior, not on OSD side, isn't it?" Regards Ahmed On Sun, Jan 22, 2017 at 6:45 PM, Udo Lembkewrote: > Hi, > > I don't use mds, but I thinks it's the same like with rdb - the readed > data are cached on the OSD-nodes. > > The 4MB-chunks of the 3G-file fit completly in the cache, the other not. > > > Udo > > > On 18.01.2017 07:50, Ahmed Khuraidah wrote: > > Hello community, > > > > I need your help to understand a little bit more about current MDS > > architecture. > > I have created one node CephFS deployment and tried to test it by fio. > > I have used two file sizes of 3G and 320G. My question is why I have > > around 1k+ IOps when perform random reading from 3G file into > > comparison to expected ~100 IOps from 320G. Could somebody clarify > > where is read buffer/caching performs here and how to control it? > > > > A little bit about setup - Ubuntu 14.04 server that consists Jewel > > based: one MON, one MDS (default parameters, except mds_log = false) > > and OSD using SATA drive (XFS) for placing data and SSD drive for > > journaling. No RAID controller and no pool tiering used > > > > Thanks > > > > > > > > ___ > > 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
[ceph-users] Cannot search within ceph-users archives
Hi all, I tried to use the "Search" functionality on the ceph-users archives page ( http://lists.ceph.com/pipermail/ceph-users-ceph.com/), but each time I search for something, I get the following error: ht://Dig error htsearch detected an error. Please report this to the webmaster of this site by sending an e-mail to: mail...@listserver-dap.dreamhost.com The error message is: Unable to read word database file '/dh/mailman/dap/archives/private/ceph-users-ceph.com/htdig/db.words.db' Did you run htdig? Can you please help? Thanks, Prashant -- Prashant Murthy Sr Director, Software Engineering | Salesforce Mobile: 919-961-3041 -- ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Testing a node by fio - strange results to me
Hi, I don't use mds, but I thinks it's the same like with rdb - the readed data are cached on the OSD-nodes. The 4MB-chunks of the 3G-file fit completly in the cache, the other not. Udo On 18.01.2017 07:50, Ahmed Khuraidah wrote: > Hello community, > > I need your help to understand a little bit more about current MDS > architecture. > I have created one node CephFS deployment and tried to test it by fio. > I have used two file sizes of 3G and 320G. My question is why I have > around 1k+ IOps when perform random reading from 3G file into > comparison to expected ~100 IOps from 320G. Could somebody clarify > where is read buffer/caching performs here and how to control it? > > A little bit about setup - Ubuntu 14.04 server that consists Jewel > based: one MON, one MDS (default parameters, except mds_log = false) > and OSD using SATA drive (XFS) for placing data and SSD drive for > journaling. No RAID controller and no pool tiering used > > Thanks > > > > ___ > 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