Re: Is cepf feasible for storing large no. of small files with care of handling OSD failure(disk i/o error....) so it can complete pending replication independent from no. of files

["upendrayadav.u" <upendrayadav.u@xxxxxxxxxxxx>]

Thanks a lot... for your detailed and very clear answer :)

Regards,

Upendra Yadav

DFS

---- On Fri, 03 Jan 2014 15:52:09 +0530 Wido den Hollander <wido@xxxxxxxx> wrote ----

On 01/02/2014 05:42 PM, upendrayadav.u wrote:
> Hi,
>
> 1. Is ceph is feasible for storing large no. of small files in ceph
> cluster with care of osd failure and recovery process.
>
> 2. if we have *4TB **OSD(almosst 85% full)* and storing only small size
> files(500 KB to 1024 KB), And it got failed(due to disk i/o error....)
> then how much time it will take to complete all pending replication?
> What are the factors that will affect this replication process? Is this
> total time to complete pending replication is independent from the *no.
> of files* to replicate. Means failure recovery depends on only size of
> OSD not on no. of files to replicate.

Please forget the concept of files, we talk about object inside Ceph /
RADOS :)

It's hard to predict how long it will take, but it depends on the number
of PGs and the amount of objects inside the PGs.

The more objects you have, the longer recovery will take.

Btw, I wouldn't fill a OSD until 85%, that's a bit to high. I'd stay
below 80%.

> 3. We have 64 no. of disks(with JBOD configuration) for one machine. Is
> this necessary to run one OSD per disk. In this, Is there possible to
> combined 8 no. of disk for one OSD?
>

Run one OSD per disk, that gives you best fault tolerance. You can run
one OSD with something like RAID on multiple drives, but that reduces
your fault tolerance.

Wido

> Thanks a lot for giving ur precious time for me... hope this time will
> get response.
> *
> *
> *:( Last 2 mail have no reply... :( *
>
> *
> *
> *Regards,*
> *Upendra Yadav*
> *DFS*
>
>
>
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> ceph-users@xxxxxxxxxxxxxx
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>


--
Wido den Hollander
42on B.V.

Phone: +31 (0)20 700 9902
Skype: contact42on
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