If one VM is using multiple rbd’s then using just $pid is not enough. Socket shows only one (first) rbd statistics.
Regards
Mateusz
From: Jason Dillaman [mailto:jdillama@xxxxxxxxxx]
Sent: Tuesday, July 24, 2018 2:39 PM
To: Mateusz Skala (UST, POL) <Mateusz.Skala@xxxxxxxxxxxxxx>
Cc: ceph-users <ceph-users@xxxxxxxxxxxxxx>
Subject: Re: [ceph-users] Read/write statistics per RBD image
Hello again,
How can I determine $cctid for specific rbd name? Or is there any good way to map admin-socket
with rbd?
The $cctid is effectively pseudo-random (it's a memory location within the process). Your best best is just a $pid mapping.
Regards
Mateusz
Thank You for help, it is exactly that I need.
Regards
Mateusz
From: Jason
Dillaman [mailto:jdillama@xxxxxxxxxx]
Sent: Wednesday, July 18, 2018 1:28 PM
To: Mateusz Skala (UST, POL) <Mateusz.Skala@xxxxxxxxxxxxxx>
Cc: dillaman <dillaman@xxxxxxxxxx>; ceph-users <ceph-users@xxxxxxxxxxxxxx>
Subject: Re: [ceph-users] Read/write statistics per RBD image
Yup, on the host running librbd, you just need to enable the "admin socket" in your ceph.conf and then use "ceph --admin-daemon /path/to/image/admin/socket.asok perf dump" (i.e.
not "ceph perf dump").
See the example in this tip window [1] for how to configure for a "libvirt" CephX user.
Thanks for response.
In ‘ceph perf dump’ there is no statistics for read/write operations on specific RBD image,
only for osd and total client operations. I need to get statistics on one specific RBD image, to get top used images. It is possible?
Regards
Mateusz
From:
Jason Dillaman [mailto:jdillama@xxxxxxxxxx]
Sent: Tuesday, July 17, 2018 3:29 PM
To: Mateusz Skala (UST, POL) <Mateusz.Skala@xxxxxxxxxxxxxx>
Cc: ceph-users <ceph-users@xxxxxxxxxxxxxx>
Subject: Re: [ceph-users] Read/write statistics per RBD image
Yes, you just need to enable the "admin socket" in your ceph.conf and then use "ceph --admin-daemon /path/to/image/admin/socket.asok perf dump".
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