Re: Ceph OSD on Hardware RAID

[Maged Mokhtar <mmokhtar@xxxxxxxxxxx>]

On 2017-09-29 17:14, Hauke Homburg wrote:

Hello,

Ich think that the Ceph Users don't recommend on ceph osd on Hardware
RAID. But i haven't found a technical Solution for this.

Can anybody give me so a Solution?

Thanks for your help

Regards

Hauke

You get better performance when you have 5 OSD daemons managing 5 physical disk than 1 OSD daemon  managing a faster RAID 5 disk. Each daemon is a service that is allocated cores/threads/message queues and needs to communicate with peers over the network...the more you have the better.

If you do have a RAID controller with battery backed write back cache you can configure disks in RAID 0 single disk instead of JBOD, it may give better write performance/latency..but needs to be tested to see which is faster.

 

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