[ceph-users] Re: Unexpected slow read for HDD cluster (good write speed)

2023-03-28 Thread Marc
Yes it pays off to know what to do before you do it, instead of after. If you complain about speed, is it a general unfounded complaint or did you compare ceph with similar solutions? I have really no idea what the standards are for these types of solutions. I can remember asking at such

[ceph-users] Re: Unexpected slow read for HDD cluster (good write speed)

2023-03-28 Thread Arvid Picciani
Yes, during my last adventure of trying to get any reasonable performance out of ceph, i realized my testing methodology was wrong. Both the kernel client and qemu have queues everywhere that make the numbers hard to understand. fio has rbd support, which gives more useful values.

[ceph-users] Re: Unexpected slow read for HDD cluster (good write speed)

2023-03-20 Thread Janne Johansson
Den mån 20 mars 2023 kl 09:45 skrev Marc : > > > While > > reading, we barely hit the mark of 100MB/s; we would expect at least > > something similar to the write speed. These tests are being performed in > > a > > pool with a replication factor of 3. > > > > > > You don't even describe how you

[ceph-users] Re: Unexpected slow read for HDD cluster (good write speed)

2023-03-20 Thread Marc
> While > reading, we barely hit the mark of 100MB/s; we would expect at least > something similar to the write speed. These tests are being performed in > a > pool with a replication factor of 3. > > You don't even describe how you test? And why would you expect something like the write