2014-06-13 11:09 GMT+08:00 Ke-fei Lin :
> Hi list,
>
> I deployed a Windows 7 VM with qemu-rbd disk, and got an unexpected booting
> phase performance.
>
> I discovered that when booting the Windows VM up, there are consecutive ~2
> minutes that `ceph -w` gives me an interesting log like: "... 567
On Sat, 14 Jun 2014, Ke-fei Lin wrote:
> 2014-06-14 0:11 GMT+08:00 Sage Weil :
> > Right now, no.
> >
> > We could add a minimum read size to librbd when caching is enabled...
> > that would not be particularly difficult.
> >
> > sage
>
> Thanks, so is it possible to set some options like *readahe
2014-06-14 0:25 GMT+08:00 Andrey Korolyov :
> In my belief, lot of sequential small reads will be aggregated after
> all when targeting filestore contents (of course if the moment of issuing
> next one is not dependent on status of previous read, otherwise
> they`ll be separated in time in such way
2014-06-14 0:11 GMT+08:00 Sage Weil :
> Right now, no.
>
> We could add a minimum read size to librbd when caching is enabled...
> that would not be particularly difficult.
>
> sage
Thanks, so is it possible to set some options like *readahead* in librbd
or QEMU? Seems no docs mentioned this...
B
In my belief, lot of sequential small reads will be aggregated after
all when targeting filestore contents (of course if the moment of issuing
next one is not dependent on status of previous read, otherwise
they`ll be separated in time in such way that the rotating media
scheduler will not be able
Right now, no.
We could add a minimum read size to librbd when caching is enabled...
that would not be particularly difficult.
sage
On Fri, 13 Jun 2014, Ke-fei Lin wrote:
> 2014-06-13 22:04 GMT+08:00 Andrey Korolyov :
> >
> > On Fri, Jun 13, 2014 at 5:50 PM, Ke-fei Lin wrote:
> > > Thanks,
2014-06-13 22:04 GMT+08:00 Andrey Korolyov :
>
> On Fri, Jun 13, 2014 at 5:50 PM, Ke-fei Lin wrote:
> > Thanks, Andrey.
> >
> > I tried `virsh domblkstat hda` (only this VM in whole cluster) and
got
> > these values:
> >
> > hda rd_req 70682
> > hda rd_bytes 229894656
> > hda wr_req 1067
> > hda
On Fri, Jun 13, 2014 at 5:50 PM, Ke-fei Lin wrote:
> 2014-06-13 21:23 GMT+08:00 Andrey Korolyov :
>
>> On Fri, Jun 13, 2014 at 7:09 AM, Ke-fei Lin wrote:
>> > Hi list,
>> >
>> > I deployed a Windows 7 VM with qemu-rbd disk, and got an unexpected
>> > booting
>> > phase performance.
>> >
>> > I di
2014-06-13 21:23 GMT+08:00 Andrey Korolyov :
> On Fri, Jun 13, 2014 at 7:09 AM, Ke-fei Lin wrote:
> > Hi list,
> >
> > I deployed a Windows 7 VM with qemu-rbd disk, and got an unexpected
> booting
> > phase performance.
> >
> > I discovered that when booting the Windows VM up, there are consecuti
On Fri, Jun 13, 2014 at 7:09 AM, Ke-fei Lin wrote:
> Hi list,
>
> I deployed a Windows 7 VM with qemu-rbd disk, and got an unexpected booting
> phase performance.
>
> I discovered that when booting the Windows VM up, there are consecutive ~2
> minutes that `ceph -w` gives me an interesting log lik
Hi list,
I deployed a Windows 7 VM with qemu-rbd disk, and got an unexpected booting
phase performance.
I discovered that when booting the Windows VM up, there are consecutive ~2
minutes that `ceph -w` gives me an interesting log like: "... 567 KB/s rd,
567 op/s", "... 789 KB/s rd, 789 op/s" and
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