I was told by someone at Red Hat that ISCSI performance is still several magnitudes behind using the client / driver.

Thanks,
-Drew


-----Original Message-----
From: Nathan Fish <lordcirth@gmail.com>
Sent: Thursday, October 24, 2019 1:27 PM
To: Ryan <rswagoner@gmail.com>
Cc: ceph-users <ceph-users@ceph.com>
Subject: [ceph-users] Re: iSCSI write performance

Are you using Erasure Coding or replication? What is your crush rule?
What SSDs and CPUs? Does each OSD use 100% of a core or more when writing?

On Thu, Oct 24, 2019 at 1:22 PM Ryan <rswagoner@gmail.com> wrote:
>
> I'm in the process of testing the iscsi target feature of ceph. The cluster is running ceph 14.2.4 and ceph-iscsi 3.3. It consists of 5 hosts with 12 SSD OSDs per host. Some basic testing moving VMs to a ceph backed datastore is only showing 60MB/s transfers. However moving these back off the datastore is fast at 200-300MB/s.
>
> What should I be looking at to track down the write performance issue? In comparison with the Nimble Storage arrays I can see 200-300MB/s in both directions.
>
> Thanks,
> Ryan
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