Date: Mon, 9 Mar 2009 17:27:20 -0400 From: "Jason T. Nelson" <jtn@jtn.cx> To: freebsd-questions@freebsd.org Cc: freebsd-scsi@freebsd.org Subject: iSCSI initiator lockups Message-ID: <20090309212720.GA49294@jtn.cx>
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[-- Attachment #1 --] I'm running into some odd headaches regarding what looks like iSCSI initiators going to sleep for approximately 30 seconds before returning to life and pumping a ton of information back to the target. While this is happening, system load climbs up alarmingly fast. Looking at tcpdumps in Wireshark, it shows what appears to be a nearly exact 30 second delay where the initiator stops talking to the target server, then abruptly restarts. Currently 8 machines are talking to 2 servers with 4 targets a piece, and while its working, we get good throughput. Activity is moderately high, as we are using the iSCSI targets as spool disks in an email cluster. As it appears that iscsi-target is a single-threaded process, would it be valuable to put each target in its own process on its own port? At any rate, this is causing serious problems on the mail processing machines. -- Jason T. Nelson <jtn@jtn.cx> GPG key 0xFF676C9E [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) iEYEARECAAYFAkm1ibcACgkQ+rtZnf9nbJ4V6wCeJr2pr9s77kOH+PalLDQWfeu+ NuoAoL/8JEzJ0n00W1r5H+TZsNmFzSbz =YS7i -----END PGP SIGNATURE-----
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