Re: [ceph-users] benefit of using stripingv2

2015-09-17 Thread Ilya Dryomov
On Thu, Sep 17, 2015 at 6:01 PM, Gregory Farnum wrote: > On Thu, Sep 17, 2015 at 7:55 AM, Corin Langosch > wrote: >> Hi Greg, >> >> Am 17.09.2015 um 16:42 schrieb Gregory Farnum: >>> Briefly, if you do a lot of small direct IOs (for instance, a database >>> journal) then striping lets you send ea

Re: [ceph-users] benefit of using stripingv2

2015-09-17 Thread Gregory Farnum
On Thu, Sep 17, 2015 at 7:55 AM, Corin Langosch wrote: > Hi Greg, > > Am 17.09.2015 um 16:42 schrieb Gregory Farnum: >> Briefly, if you do a lot of small direct IOs (for instance, a database >> journal) then striping lets you send each sequential write to a >> separate object. This means they don'

Re: [ceph-users] benefit of using stripingv2

2015-09-17 Thread Corin Langosch
Hi Greg, Am 17.09.2015 um 16:42 schrieb Gregory Farnum: > Briefly, if you do a lot of small direct IOs (for instance, a database > journal) then striping lets you send each sequential write to a > separate object. This means they don't pile up behind each other > grabbing write locks and can compl

Re: [ceph-users] benefit of using stripingv2

2015-09-17 Thread Gregory Farnum
On Wed, Sep 16, 2015 at 11:56 AM, Corin Langosch wrote: > Hi guys, > > afaik rbd always splits the image into chunks of size 2^order (2^22 = 4MB by > default). What's the benefit of specifying > the feature flag "STRIPINGV2"? I couldn't find any documenation about it > except > http://ceph.com/d

[ceph-users] benefit of using stripingv2

2015-09-16 Thread Corin Langosch
Hi guys, afaik rbd always splits the image into chunks of size 2^order (2^22 = 4MB by default). What's the benefit of specifying the feature flag "STRIPINGV2"? I couldn't find any documenation about it except http://ceph.com/docs/master/man/8/rbd/#striping which doesn't explain the benefits (or