On Tue, Jan 3, 2017 at 10:31 PM, Graham Allan <[email protected]> wrote: > We did some CBT tests here a few months ago which included some dmcrypt > comparisons - the performance hit was non-zero, but close enough, around > ~2-3%. > > (CentOS 7.2 with E5-2630 v4 cpus, jewel release, default dmcrypt > parameters which IIRC is AES-XTS now)
Is it possible to share the CBT results? just to check. Thanks Swami > > > On 1/3/2017 7:48 AM, Adrien Gillard 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 <[email protected] >> <mailto:[email protected]>> wrote: >> >> __ __ >> >> __ __ >> >> *From:*ceph-users [mailto:[email protected] >> <mailto:[email protected]>] *On Behalf Of *Kent Borg >> *Sent:* 03 January 2017 12:47 >> *To:* M Ranga Swami Reddy <[email protected] >> <mailto:[email protected]>> >> *Cc:* ceph-users <[email protected] >> <mailto:[email protected]>> >> *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 <[email protected] >> <mailto:[email protected]>> 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.____ >> >> > -- > Graham Allan > Minnesota Supercomputing Institute - [email protected] > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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