I found this thread after fighting the same problem in Nexenta which uses the OpenSolaris kernel from b104. Thankfully, I think I have (for the moment) solved my problem.
Background: I have an LSI 3081e-R (1068E based) adapter which experiences the same disconnected command timeout error under relatively light load. This card connects to a Supermicro chassis using 2 MiniSAS cables to redundant expanders that are attached to 18 SAS drives. The card ran the latest IT firmware (1.29?). This server is a new install, and even installing from the CD to two disks in a mirrored ZFS root would randomly cause the disconnect error. The system remained unresponsive until after a reboot. I tried the workarounds mentioned in this thread, namely using "set mpt:mpt_enable_msi = 0" and "set xpv_psm:xen_support_msi = -1" in /etc/system. Once I added those lines, the system never really became unresponsive, however there were partial read and partial write messages that littered dmesg. At one point there appeared to be a disconnect error ( can not confirm ) that the system recovered from. Eventually, I became desperate and flashed the IR (Integrated Raid) firmware over the top of the IT firmware. Since then, I have had no errors in dmesg of any kind. I even removed the workarounds from /etc/system and still have had no issues. The mpt driver is exceptionally quiet now. I'm interested to know if anyone who has a 1068E based card is having these problems using the IR firmware, or if they all seem to be IT (initiator target) related. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
