[ceph-users] Small modifications to Bluestore migration documentation

Hello, Luminous 12.2.2 There were several discussions on this list concerning Bluestore migration, as official documentation does not work quite well yet. In particular this one http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-January/024190.html Is it possible to modify official documen

Re: [ceph-users] Bareos and libradosstriper works only for 4M sripe_unit size

47 48 .. 4f 50 .. 57 58 .. 5f Obj5= 8MObj6= 8MObj7= 8MObj8= 8M 60 .. 6768 .. 6f70 .. 7778 .. 7f Alexander. On Wed, Oct 11, 2017 at 3:19 PM, Alexander Kushnirenko < kushnire...@gmail.com> wrote: > Oh! I put a wrong link

Re: [ceph-users] Bareos and libradosstriper works only for 4M sripe_unit size

, Alexander Kushnirenko < kushnire...@gmail.com> wrote: > Hi, Ian! > > Thank you for your reference! > > Could you comment on the following rule: > object_size = stripe_unit * stripe_count > Or it is not necessarily so? > > I refer to page 8 in this report: > &

Re: [ceph-users] Bareos and libradosstriper works only for 4M sripe_unit size

Hi, Ian! Thank you for your reference! Could you comment on the following rule: object_size = stripe_unit * stripe_count Or it is not necessarily so? I refer to page 8 in this report: https://indico.cern.ch/event/531810/contributions/2298934/at tachments/1358128/2053937/Ceph-Experience-at-RAL-f

Re: [ceph-users] Bareos and libradosstriper works only for 4M sripe_unit size

RadosStriper > set_object_layout_object_size(unsigned int object_size); > > So I imagine you specify it with those the same way you've set the stripe > unit and counts. > > On Sat, Oct 7, 2017 at 12:38 PM Alexander Kushnirenko < > kushnire...@gmail.com> wrote: > >&g

[ceph-users] advice on number of objects per OSD

Hi, Are there any recommendations on what is the limit when osd performance start to decline because of large number of objects? Or perhaps a procedure on how to find this number (luminous)? My understanding is that the recommended object size is 10-100 MB, but is there any performance hit due to

Re: [ceph-users] Bareos and libradosstriper works only for 4M sripe_unit size

counts. I would expect you need to make sure that > the size is an integer multiple of the stripe unit. And it probably > defaults to a 4MB object if you don't specify one? > > On Fri, Sep 29, 2017 at 2:09 AM Alexander Kushnirenko < > kushnire...@gmail.com> wrote: > >&g

[ceph-users] How to use rados_aio_write correctly?

Hello, I'm working on third party code (Bareos Storage daemon) which gives very low write speeds for CEPH. The code was written to demonstrate that it is possible, but the speed is about 3-9 MB/s which is too slow. I modified the routine to use rados_aio_write instead of rados_write, and was ab

Re: [ceph-users] rados_read versus rados_aio_read performance

e you are dominated by the per-op already rather than the > throughout of your cluster. Using aio or multiple threads will let you > parallelism requests. > -Greg > On Fri, Sep 29, 2017 at 3:33 AM Alexander Kushnirenko < > kushnire...@gmail.com> wrote: > >> Hello, >

[ceph-users] rados_read versus rados_aio_read performance

Hello, We see very poor performance when reading/writing rados objects. The speed is only 3-4MB/sec, compared to 95MB rados benchmarking. When you look on underline code it uses librados and linradosstripper libraries (both have poor performance) and the code uses rados_read and rados_write func

[ceph-users] Bareos and libradosstriper works only for 4M sripe_unit size

Hi, I'm trying to use CEPH-12.2.0 as storage for with Bareos-16.2.4 backup with libradosstriper1 support. Libradosstriber was suggested on this list to solve the problem, that current CEPH-12 discourages users from using object with very big size (>128MB). Bareos treat Rados Object as Volume and

Re: [ceph-users] osd crashes with large object size (>10GB) in luminos Rados

objects. Objects shouldn’t be > stored as large as that and performance will also suffer. > > > > *From:* ceph-users [mailto:ceph-users-boun...@lists.ceph.com] *On Behalf > Of *Alexander Kushnirenko > *Sent:* 26 September 2017 13:50 > *To:* ceph-users@lists.ceph.com > *Subject:*

[ceph-users] osd crashes with large object size (>10GB) in luminos Rados

Hello, We successfully use rados to store backup volumes in jewel version of CEPH. Typical volume size is 25-50GB. Backup software (bareos) use Rados objects as backup volumes and it works fine. Recently we tried luminous for the same purpose. In luminous developers reduced osd_max_object_size