] On Behalf Of Bruce
McFarland
Sent: Monday, February 02, 2015 3:39 PM
To: Mykola Golub; Udo Lembke
Cc: ceph-us...@ceph.com; Prashanth Nednoor
Subject: Re: [ceph-users] RBD caching on 4K reads???
I'm still missing something. I can check on the monitor to see that the running
config on the cluster
-users] RBD caching on 4K reads???
On Fri, Jan 30, 2015 at 10:09:32PM +0100, Udo Lembke wrote:
Hi Bruce,
you can also look on the mon, like
ceph --admin-daemon /var/run/ceph/ceph-mon.b.asok config show | grep
cache
rbd cache is a client setting, so you have to check this connecting to the
client
Message-
From: Nicheal [mailto:zay11...@gmail.com]
Sent: Monday, February 02, 2015 7:35 PM
To: Bruce McFarland
Cc: ceph-us...@ceph.com; Prashanth Nednoor
Subject: Re: [ceph-users] RBD caching on 4K reads???
It seems you use the kernel rbd. So rbd_cache does not work, which is just
designed
It seems you use the kernel rbd. So rbd_cache does not work, which is
just designed for librbd. Kernel rbd is directly using the system page
cache. You said that you have already run like echo 3
/proc/sys/vm/drop_cache to invalidate all pages cached in kernel. So
do you test the /dev/rbd1 based
.
-Original Message-
From: Nicheal [mailto:zay11...@gmail.com]
Sent: Monday, February 02, 2015 7:35 PM
To: Bruce McFarland
Cc: ceph-us...@ceph.com; Prashanth Nednoor
Subject: Re: [ceph-users] RBD caching on 4K reads???
It seems you use the kernel rbd. So rbd_cache does not work, which is just
and
physically disabling kernel caching.
-Original Message-
From: Nicheal [mailto:zay11...@gmail.com]
Sent: Monday, February 02, 2015 7:35 PM
To: Bruce McFarland
Cc: ceph-us...@ceph.com; Prashanth Nednoor
Subject: Re: [ceph-users] RBD caching on 4K reads???
It seems you use the kernel rbd
On Fri, Jan 30, 2015 at 10:09:32PM +0100, Udo Lembke wrote:
Hi Bruce,
you can also look on the mon, like
ceph --admin-daemon /var/run/ceph/ceph-mon.b.asok config show | grep cache
rbd cache is a client setting, so you have to check this connecting to
the client admin socket. Its location is
Hi Bruce,
hmm, sounds for me like the rbd cache.
Can you look, if the cache is realy disabled in the running config with
ceph --admin-daemon /var/run/ceph/ceph-osd.0.asok config show | grep cache
Udo
On 30.01.2015 21:51, Bruce McFarland wrote:
I have a cluster and have created a rbd device -
I have a cluster and have created a rbd device - /dev/rbd1. It shows up as
expected with 'rbd -image test info' and rbd showmapped. I have been looking at
cluster performance with the usual Linux block device tools - fio and vdbench.
When I look at writes and large block sequential reads I'm
[mailto:ulem...@polarzone.de]
Sent: Friday, January 30, 2015 1:00 PM
To: Bruce McFarland; ceph-us...@ceph.com
Cc: Prashanth Nednoor
Subject: Re: [ceph-users] RBD caching on 4K reads???
Hi Bruce,
hmm, sounds for me like the rbd cache.
Can you look, if the cache is realy disabled in the running config
*To:* Bruce McFarland; ceph-us...@ceph.com
*Cc:* Prashanth Nednoor
*Subject:* Re: [ceph-users] RBD caching on 4K reads???
Hi Bruce,
hmm, sounds for me like the rbd cache.
Can you look, if the cache is realy disabled in the running config with
ceph --admin-daemon /var/run/ceph/ceph-osd.0
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