From: Andrew Savchenko <bircoph@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] ceph on btrfs
Date: Thu, 23 Oct 2014 17:49:03 +0400 [thread overview]
Message-ID: <20141023174903.dfc6e5be9f0213c4cd884101@gmail.com> (raw)
In-Reply-To: <loom.20141022T213802-32@post.gmane.org>
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Hi,
On Wed, 22 Oct 2014 20:05:48 +0000 (UTC) James wrote:
> Hello,
>
> So looking at the package sys-cluster/ceph, I see these flags:
> cryptopp debug fuse gtk +libaio libatomic +nss radosgw static-libs tcmalloc
> xfs zfs No specific flags for btrfs?
Ceph is optimized for btrfs by design, it has no configure options
to enable or disable btrfs-related stuff:
https://github.com/ceph/ceph/blob/master/configure.ac
No configure option => no use flag.
> ceph-0.67.9 is marked stable, while 0.67.10 and 0.80.5 are marked
> (yellow) testing and *9999 is marked (red) masked. So what version
> would anyone recommend, with what flags? [1]
Just use the latest (0.80.7 ATM). You may just nerame and rehash
0.80.5 ebuild (usually this works fine). Or you may stay with
0.80.5, but with fewer bug fixes.
> Ceph will be the DFS on top of a (3) node mesos+spark cluster.
> btrfs is being set up with 2 disks in raid 1 on each system. Btrfs
> seems to be keenly compatible with ceph [2].
If raid is supposed to be read more frequently than written to,
then my favourite solution is raid-10-f2 (2 far copies, perfectly
fine for 2 disks). This will give you read performance of raid-0 and
robustness of raid-1. Though write i/o will be somewhat slower due
to more seeks.
Also it depends on workload: if you'll have a lot of independent
read requests, raid-1 will be fine too. But for large read i/o from
a single or few clients raid-10-f2 is the best imo.
> Guidance and comments, warmly requested,
> James
>
>
> [1]
> http://ceph.com/docs/v0.78/rados/configuration/filesystem-recommendations/
>
> [2] http://ceph.com/docs/master/release-notes/#v0-80-firefly
Best regards,
Andrew Savchenko
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next prev parent reply other threads:[~2014-10-23 13:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-22 20:05 [gentoo-user] ceph on btrfs James
2014-10-23 13:49 ` Andrew Savchenko [this message]
2014-10-23 19:41 ` [gentoo-user] " James
2014-10-24 10:02 ` Andrew Savchenko
2014-10-24 16:20 ` James
2014-10-25 10:00 ` Andrew Savchenko
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