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.ver...@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.wea...@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 <lordci...@gmail.com> > Sent: Thursday, October 24, 2019 1:27 PM > To: Ryan <rswago...@gmail.com> > Cc: ceph-users <ceph-us...@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 <rswago...@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-le...@ceph.io > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an > email to ceph-users-le...@ceph.io > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io >
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