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. -- Martin Verges Managing director Mobile: +49 174 9335695 E-Mail: martin.verges@croit.io 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@thenap.com>:
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 _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
_______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io