[PVE-User] Proxmox VE 3.4 released!

Fabrizio Cuseo f.cuseo at panservice.it
Thu Feb 19 21:17:20 CET 2015

You can also tune ceph to have the performances you need; you can have a big pool with large, cheap and slow disks, and a pool with SSD disks; you can use infiniband to have more bandwidth between the servers, and your system will not suffer of I/O performances.

But if you prefer, you can buy two EMC2 SAS+SSD storage, replication software license (to have redundancy), fiber channel HBAs and switches; you will find a "small" difference on the final budget :) 

Regards, Fabrizio 


----- Il 19-feb-15, alle 19:49, Philippe Schwarz phil at schwarz-fr.net ha scritto:

> Hash: SHA1
> 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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Fabrizio Cuseo - mailto:f.cuseo at panservice.it
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