Re: [Ceph] Recovery is very Slow

[Vladimir Bashkirtsev <vladimir@xxxxxxxxxxxxxxx>]

If you have 15 drives of 1 TB what difference it makes size wise if you put them into 3 RAID0 first and then to 3 OSDs vs 15 OSDs? None! You still have 15TB to work with. But by introducing RAID0 you artificially limited what Ceph can do. Just get rid of RAID there just no need for it if you want to use Ceph.

On 28 October 2021 7:25:28 pm AEDT, Lokendra Rathour <lokendrarathour@xxxxxxxxx> wrote:

Hey Janne,

Thanks for the feedback, we only wanted to have huge space to test more with more data. do you advise some other way to plan this out?

So I have 15 disks with 1 TB each.  Creating multiple OSD would help or please advise.

thanks,

Lokendra

On Thu, Oct 28, 2021 at 1:52 PM Janne Johansson <icepic.dz@xxxxxxxxx> wrote:

Den tors 28 okt. 2021 kl 10:18 skrev Lokendra Rathour <lokendrarathour@xxxxxxxxx>:
>
> Hi Christian,
> Thanks for the update.
> I have 5 SSD on each node i.e. a total of 15 SSD using which I have created this RAID 0 Disk, which in Ceph becomes three OSD. Each OSD with around 4.4 TB of disk. and in total it is coming around 13.3 TB.
> Do you feel local RAID is an issue here? Keeping independent disks can help recovery fast or increase the performance? please advice.


That is a very poor way to set up ceph storage.


--
May the most significant bit of your life be positive.

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~ Lokendra

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