Interesting -
I had tried that on the RBD volumes only (via blockdev --setra, but I
think the effect is the same as tweaking read_ahead_kb directly),
however it made no difference. Unfortunately I didn't think to adjust on
the OSD's too - I'll try it out.
One thing that seemed to make a big
@lists.ceph.com
Subject: Re: [ceph-users] Live database files on Ceph
On 03/04/2014 23:43, Brian Beverage wrote:
> Here is some info on what I am trying to accomplish. My goal here is
> to find the least expensive way to get into Virtualization and storage
> without the cost of a SAN and Pr
One thing you can try is tuning read_ahead_kb on the OSDs and/or the RBD
volume(s) and see if that helps. On some hardware we've seen this
improve sequential read performance dramatically.
Another big culprit that can really hurt sequential reads is
fragmentation. BTRFS is particularly bad w
Hi,
We're running mysql in multi-master cluster (galera), mysql standalones,
postgresql, mssql and oracle db's on ceph RBD via QEMU/KVM. As someone else
pointed out it is usually faster with ceph, but sometimes you'll get some
odd slow reads.
Latency is our biggest enemy.
Oracle comes with an aw
I've seen this "fast everything except sequential reads" asymmetry in my
own simple dd tests on RBD images but haven't really understood the cause.
Could you clarify what's going on that would cause that kind of
asymmetry. I've been assuming that once I get around to turning
on/tuning read caching
As others have mentioned, there is no reason you cannot run databases on
Ceph storage. I've been running/testing Postgres and Mysql/Mariadb on
Ceph RDB volumes for quite a while now - since version 0.50 (typically
inside KVM containers but via the kernel driver will work too).
With a reasonabl
On 03/04/2014 23:43, Brian Beverage wrote:
Here is some info on what I am trying to accomplish. My goal here is to
find the least expensive way to get into Virtualization and storage
without the cost of a SAN and Proprietary software
...
I have been
tasked with taking a new start up project and
Thanks for the replies.
Here is some info on what I am trying to accomplish. My goal here is to
find the least expensive way to get into Virtualization and storage
without the cost of a SAN and Proprietary software(eg Vmware, Hyper-V). We
currently run about 6 servers that host our web based appli
Back last fall I ran the DBT3 TPC-H test suite using mariadb on top of a
QEMU/KVM RBD volume (dumpling release) on a virtual machine. I
intentionally kept the cache sizes small to force more disk IO and
compared to the same test running on a local disk passed through to the
VM as well.
In th
Ceph will allow anything; it's just providing a block device. How it
performs will depend quite a lot on the database workload you're
applying, though. We've heard from people who think it's wonderful and
others who don't, depending on what hardware they're using and what
their use case is. You'll
I am looking at setting up a Ganeti cluster using KVM and CentOS. While
looking at storage I first looked at Gluster but noticed in the
documentation it does not allow Live Database files to be saved to it. Does
Ceph allow the use of LIVE database files being saved to it. If so does the
database pe
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