[PVE-User] Proxmox VE 3.4 released!

[Philippe Schwarz]

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Le 19/02/2015 19:20, Alexandre DERUMIER a écrit :
>>> I don't think it's a good idea to build Ceph on top of ZFS.
>>> Ceph expects to give it full hard disks for storage and using
>>> ZFS with multiple disks will degrade performance.
> 
> Yes, don't use zfs for ceph. It's not officially supported, and as
> ceph use specific features of each filesystem (xfs, ext4 and
> btrfs), I can't recommand to use zfs in production.
> 
> xfs is the current recommended filesystem for ceph osds.
> 
> 
OK, ok, i surrender.
Read too fast the docs i found. XFS instead seems to be better.

But, even if i understand the mandatory drawbacks of a clustered FS
(ceph), i find the performance penalty to be huge :

According to http://www.sebastien-han.fr/blog/2012/08/26/ceph-benchmarks/
with the "Insane servers" (close to mine) and a dedicated 1G network
(mine will be 10gbe), the write bandwidth is between 110 and 150 MB/s.
It's not a shame, but with 64GB RAM, Raid of SSD and 32 Cores, you
could expect twice the bandwidth at least.

OK, for the redundant FS, but what a huge price i'd pay for..



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