2014-06-18 22:44 GMT+08:00 Gregory Farnum :
> On Tue, Jun 17, 2014 at 9:46 PM, Ke-fei Lin wrote:
>> 2014-06-18 1:28 GMT+08:00 Gregory Farnum :
>>> On Tue, Jun 17, 2014 at 3:22 AM, Ke-fei Lin wrote:
>>>> Hi list,
>>>>
>>>> How does RADOS ch
2014-06-18 1:28 GMT+08:00 Gregory Farnum :
> On Tue, Jun 17, 2014 at 3:22 AM, Ke-fei Lin wrote:
>> Hi list,
>>
>> How does RADOS check an object and its replica are consistent? Is there
>> a checksum in object's metadata or some other mechanisms? Does the
>>
Hi list,
How does RADOS check an object and its replica are consistent? Is there
a checksum in object's metadata or some other mechanisms? Does the
mechanism depend on
OSD's underlying file system?
And what would happen if a corrupted object being readed (like a
corrupted block in traditional fil
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 interesti
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
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
> > hd
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
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
