Hello,
we did some local testing a few days ago on a new installation of a small cluster.
Performance of our iSCSI implementation showed a performance drop of 20-30% against krbd.
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Martin Verges
Managing director
Mobile: +49 174 9335695
E-Mail: martin.verges@xxxxxxxx
Chat: https://t.me/MartinVerges
croit GmbH, Freseniusstr. 31h, 81247 Munich
CEO: Martin Verges - VAT-ID: DE310638492
Com. register: Amtsgericht Munich HRB 231263
Web: https://croit.io
YouTube: https://goo.gl/PGE1Bx
Am Do., 24. Okt. 2019 um 19:37 Uhr schrieb Drew Weaver <drew.weaver@xxxxxxxxxx>:
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@xxxxxxxxx>
Sent: Thursday, October 24, 2019 1:27 PM
To: Ryan <rswagoner@xxxxxxxxx>
Cc: ceph-users <ceph-users@xxxxxxxx>
Subject: 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@xxxxxxxxx> 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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