Re: Fancy striping support

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Hi Yan,

Thank you for that quick answer. I will try the fuse client. Maybe it would not hurt to make this a little more explicit in the docs?

Best regards,

Nicolas Canceill
Scalable Storage Systems
SURFsara (Amsterdam, NL)


On 11/26/2013 02:34 PM, Yan, Zheng wrote:
On Tue, Nov 26, 2013 at 9:21 PM, nicolasc <nicolas.canceill@xxxxxxxxxxx> wrote:
Hi every one,

The official doc for rbd mentions the "--stripe_count" and "--stripe_unit"
options. If I understand correctly, these allow "fancy striping" — i.e.
having multiple stripes in a single object. However, I tried and got an
error:
"unsupported stripe unit (got [my stripe unit] want 4194304)"

It seems such behavior was introduced by a patch [1] in April. The message
from Alex Elder reads: "We don't yet support fancy striping fully"

I wonder what "fully" means, and where is Ceph now on the road to "fully"
supporting fancy striping. Could anyone please enlighten me?
The kernel ceph clients (rbd and cephfs) don't support "fancy
striping". Only user space client supports it.

Yan, Zheng

Best regards,

Nicolas Canceill
Scalable Storage Systems
SURFsara (Amsterdam, NL)

[1] http://www.spinics.net/lists/ceph-devel/msg14160.html

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