rbd recover tool is an offline tool to recover rbd image when ceph cluster is
stopped.
It is usefull when you want to recover rbd image on a broken ceph cluster in
urgent.
I have used a similar prototype tool succeessfully recovering a large rbd
image in ceph cluster whose scale is 900+ o
Hi Christian,
On 04/02/15 02:39, "Christian Balzer" wrote:
>On Tue, 3 Feb 2015 15:16:57 + Colombo Marco wrote:
>
>> Hi all,
>> I have to build a new Ceph storage cluster, after i‘ve read the
>> hardware recommendations and some mail from this mailing list i would
>> like to buy these serv
Hello,
I write a ceph client using rados lib to execute a funcution upon the object.
CLIENT SIDE CODE
===
int main()
{
...
strcpy(in, "from client");
err = rados_exec(io, objname, "devctl", "devctl_op", in,
strlen(in), out, 128);
if (err < 0) {
fprintf(stderr, "r
I take back the question, because I just found that for a succeed
write opetion in the class, *no* data in the out buffer...
On Wed, Feb 4, 2015 at 5:44 PM, Dennis Chen wrote:
> Hello,
>
> I write a ceph client using rados lib to execute a funcution upon the object.
>
> CLIENT SIDE CODE
> ===
If it's of any interest, we are building our cluster with these:-
http://www.supermicro.nl/products/system/4U/F617/SYS-F617H6-FTPT_.cfm
It seemed to us that with 2U servers quite a fair chunk of the cost goes on the
metal case and redundant power supplies. The Storage optimised Fat Twin seemed
Hi Greg,
the behaviour is indeed strange. Today I was trying to reproduce the
problem, but no matter which monitor I've restarted, no matter how many
times, the bahviour was like expected: A new monitor election was called
and everything contiuned normally.
Then I continued my failover tests and
Hi Marco,
Am 04.02.2015 10:20, schrieb Colombo Marco:
...
> We choosen the 6TB of disk, because we need a lot of storage in a small
> amount of server and we prefer server with not too much disks.
> However we plan to use max 80% of a 6TB Disk
>
80% is too much! You will run into trouble.
Ceph
Hi,
We have an openstack installation that uses ceph as the storage backend.
We use mainly snapshot and boot from snapshot from an original
instance with a 200gb disk. Something like this:
1. import original image
2. make volume from image (those 2 steps were done only once, when we
installed ope
Hi all,
How do I determine which pool a PG belongs to?
(Also, is it the case that all objects in a PG belong to one pool?)
Thanks!
C.
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On Wed, 4 Feb 2015, Cristian Falcas wrote:
> Hi,
>
> We have an openstack installation that uses ceph as the storage backend.
>
> We use mainly snapshot and boot from snapshot from an original
> instance with a 200gb disk. Something like this:
> 1. import original image
> 2. make volume from imag
On Wed, Feb 4, 2015 at 1:20 PM, Chad William Seys
wrote:
> Hi all,
>How do I determine which pool a PG belongs to?
>(Also, is it the case that all objects in a PG belong to one pool?)
PGs are of the form "1.a2b3c4". The part prior to the period is the
pool ID; the part following distingui
On Feb 4, 2015, at 3:27 PM, Gregory Farnum wrote:
> On Wed, Feb 4, 2015 at 1:20 PM, Chad William Seys
> wrote:
>> Hi all,
>> How do I determine which pool a PG belongs to?
>> (Also, is it the case that all objects in a PG belong to one pool?)
>
> PGs are of the form "1.a2b3c4". The part prio
Thank you for the clarifications.
We will try to report back, but I'm not sure our use case is relevant.
We are trying to use every dirty trick to speed up the VMs.
We have only 1 replica, and 2 pools.
One pool with journal on disk, where the original instance exists (we
want to keep this one sa
Hi Cristian,
> We will try to report back, but I'm not sure our use case is relevant.
> We are trying to use every dirty trick to speed up the VMs.
we have the same use-case.
> The second pool is for the tests machines and has the journal in ram,
> so this part is very volatile. We don't really
On 5 February 2015 at 07:22, Sage Weil wrote:
> > Is the snapshoting performed by ceph or by the fs? Can we switch to
> > xfs and have the same capabilities: instant snapshot + instant boot
> > from snapshot?
>
> The feature set and capabilities are identical. The difference is that on
> btrfs w
when I put file failed, and run the function "
RGWRados::cls_obj_complete_cancel",
why we use CLS_RGW_OP_ADD not use CLS_RGW_OP_CANCEL?
why we set poolid is -1 and set epoch is 0?
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Hi,
>>What I saw after enabling RBD cache it is working as expected, means
>>sequential write has better MBps than random write. can somebody explain this
>>behaviour ?
This is because rbd_cache merge coalesced ios in bigger ios, so it's working
only with sequential workload.
you'll do less i
Hello,
On Wed, 4 Feb 2015 09:20:24 + Colombo Marco wrote:
> Hi Christian,
>
>
>
> On 04/02/15 02:39, "Christian Balzer" wrote:
>
> >On Tue, 3 Feb 2015 15:16:57 + Colombo Marco wrote:
> >
> >> Hi all,
> >> I have to build a new Ceph storage cluster, after i‘ve read the
> >> hardware
when I put the same file with multi threads, sometimes put file head oid
"ref.ioctx.operate(ref.oid, &op); " return -ECANCELED. I think this is normal.
but fuction jump to done_cancel, and run the complete_update_index_cancel(or
index_op.cancel() ), but osd execute rgw_bucket_complete_op with
We want to use this script as a service for start/stop (but it wasn't
tested yet):
#!/bin/bash
# chkconfig: - 50 90
# description: make a journal for osd.0 in ram
start () {
-f /dev/shm/osd.0.journal || ceph-osd -i 0 --mkjournal
}
stop () {
service ceph stop osd.0 && ceph-osd -i osd.0 --flush-j
Hi all,
is there any command to flush the rbd cache like the
"echo 3 > /proc/sys/vm/drop_caches" for the os cache?
Udo
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On 02/04/2015 10:44 PM, Udo Lembke wrote:
> Hi all,
> is there any command to flush the rbd cache like the
> "echo 3 > /proc/sys/vm/drop_caches" for the os cache?
>
> Udo
Do you mean the kernel rbd or librbd? The latter responds to flush
requests from the hypervisor. The former...I'm not sure i
On 02/05/2015 07:44 AM, Udo Lembke wrote:
Hi all,
is there any command to flush the rbd cache like the
"echo 3 > /proc/sys/vm/drop_caches" for the os cache?
librbd exposes it as rbd_invalidate_cache(), and qemu uses it
internally, but I don't think you can trigger that via any user-facing
qemu
Hi Dan,
I mean qemu-kvm, also librbd.
But how I can kvm told to flush the buffer?
Udo
On 05.02.2015 07:59, Dan Mick wrote:
> On 02/04/2015 10:44 PM, Udo Lembke wrote:
>> Hi all,
>> is there any command to flush the rbd cache like the
>> "echo 3 > /proc/sys/vm/drop_caches" for the os cache?
>>
>>
Hi Josh,
thanks for the info.
detach/reattach schould be fine for me, because it's only for
performance testing.
#2468 would be fine of course.
Udo
On 05.02.2015 08:02, Josh Durgin wrote:
> On 02/05/2015 07:44 AM, Udo Lembke wrote:
>> Hi all,
>> is there any command to flush the rbd cache like
I don't know the details well; I know the device itself supports the
block-device-level cache-flush commands (I know there's a SCSI-specific
one but I don't know offhand if there's a device generic one) so the
guest OS can, and does, request flushing. I can't remember if there's
also a qemu comman
Yes, So far I have tried both the options and in both cases I am able to
get better sequential performance then random (as explained by somnath) *But
*performance numbers(iops, mbps) are way less then default option, I can
understand that as ceph is dealing with 1000 times more objects then
defau
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