What is this take on such a configuration?
Is it worth the effort of tracking rebalancing at two layers, RAID
mirror and possibly Ceph if the pool has a redundancy policy. Or is it
better to just let ceph rebalance itself when you lose a non-mirrored disk?
If following the raid mirror approach,
An additional side to the RAID question: when you have a box with more
drives than you can front with OSDs due to memory or CPU constraints, is
some form of RAID advisable? At the moment one OSD per drive is the
recommendation, but from my perspective this does not scale at high drive
densities
-Paul Robinson
Sent: Thursday, October 03, 2013 12:08 PM
To: ceph-users@lists.ceph.com
Subject: Re: [ceph-users] Ceph and RAID
What is this take on such a configuration?
Is it worth the effort of tracking rebalancing at two layers, RAID
mirror and possibly Ceph if the pool has a redundancy policy
03, 2013 12:08 PM
To: ceph-users@lists.ceph.com
Subject: Re: [ceph-users] Ceph and RAID
What is this take on such a configuration?
Is it worth the effort of tracking rebalancing at two layers, RAID
mirror and possibly Ceph if the pool has a redundancy policy. Or is it
better to just let ceph
On 10/03/2013 12:40 PM, Andy Paluch wrote:
Don't you have to take down a ceph node to replace defective drive? If I have
a
ceph node with 12 disks and one goes bad, would I not have to take the entire
node down to replace and then reformat?
If I have a hotswap chassis but using just an
If following the raid mirror approach, would you then skip redundency
at the ceph layer to keep your total overhead the same? It seems that
would be risky in the even you loose your storage server with the
raid-1'd drives. No Ceph level redunancy would then be fatal. But if
you do raid-1
Hi.
I am going to create my first Ceph cluster using 3 physical servers and
Ubuntu distribution.
Each server will have three 3Tb hard drives, connected with or without a
physycal RAID controller.
I would have to be protect on a fault of one of this three servers, having
as much as space possible,
Hi,
I would not use RAID5 since it would be redundant with what Ceph provides.
My 2cts ;-)
On 02/10/2013 13:50, shacky wrote:
Hi.
I am going to create my first Ceph cluster using 3 physical servers and
Ubuntu distribution.
Each server will have three 3Tb hard drives, connected with or
Thank you very much for your answer!
So I could save the use of hardware RAID controllers on storage servers.
Good news.
I see in the Ceph documentation that I will have to manually configure the
datastore to be efficient, reliable and full fault tolerant.
Is there a particular way to configure
I successfully installed a new cluster recently following the intructions here
: http://ceph.com/docs/master/rados/deployment/
Cheers
On 02/10/2013 16:32, shacky wrote:
Thank you very much for your answer!
So I could save the use of hardware RAID controllers on storage servers. Good
news.
On 2013-10-02 07:35, Loic Dachary wrote:
Hi,
I would not use RAID5 since it would be redundant with what Ceph provides.
I would not use raid-5 (or 6) because its safety on modern drives is
questionable and because I haven't seen anyone comment on ceph's
performance -- e.g. openstack docs
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