Hi,
On Wed, 22 Oct 2014 20:05:48 + (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 * 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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