Thanks for the link. On Tue, Jan 3, 2017 at 7:18 PM, Adrien Gillard <gillard.adr...@gmail.com> wrote:
> There has been talks on the subject in the mailing list before [1] which > concur with Nick's experience as long as you use AES-XTS. > > > [1] http://lists.ceph.com/pipermail/ceph-users-ceph.com/ > 2016-March/008444.html > > On Tue, Jan 3, 2017 at 2:30 PM, Nick Fisk <n...@fisk.me.uk> wrote: > >> >> >> >> >> *From:* ceph-users [mailto:ceph-users-boun...@lists.ceph.com] *On Behalf >> Of *Kent Borg >> *Sent:* 03 January 2017 12:47 >> *To:* M Ranga Swami Reddy <swamire...@gmail.com> >> *Cc:* ceph-users <ceph-users@lists.ceph.com> >> *Subject:* Re: [ceph-users] performance with/without dmcrypt OSD >> >> >> >> On 01/03/2017 06:42 AM, M Ranga Swami Reddy wrote: >> >> On Tue, Jan 3, 2017 at 6:17 AM, Kent Borg <kentb...@borg.org> wrote: >> >> >> >> Assuming I am understanding the question... >> >> If there isn't too big a performance hit, it makes disk disposal (we >> expect disks to die, right?) much simpler. >> >> >> >> >> >> OK. Thanks. But if I have a big volumes in TB size (10 TB volume) and >> writing/reading from the big volumes - will impact on performance >> like write and read speed? >> >> >> I'd like to know, too. >> >> -kb >> >> >> >> Not specifically related to Ceph, but I built a 14 disk RAID 6 array >> (mdadm) for a recent “secure high performance seeding device in a >> briefcase” project and used dmcrypt on it. I could easily obtain over 1GB/s >> reads and writes. From tests there was no noticeable performance impact and >> CPU usage on a Xeon E3 was nothing to be concerned about. All modern CPU’s >> will HW accelerate the process if you use the AES-XTS cipher, I suspect >> there might be a severe performance impact without. >> >> >> >> Also as Ceph+network itself brings a fair amount of overhead, I wouldn’t >> suspect that dmcrypt would introduce any noticeable overhead of its own. >> >> >> _______________________________________________ >> 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
