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 > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an > email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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