> If the SCSI commands hang forever, then there is nothing that ZFS can > do, as a single write will never return. The more likely case is that > the commands are continually timining out with very long response times, > and ZFS will continue to talk to them forever.
It looks like the sd driver defaults to a 60-second timeout, which is quite long. It might be useful if FMA saw a potential fault for any I/O longer than some much lower value. (This gets tricky with power management, since if you have to wait for the disk to spin up, it can take a long time compared to normal I/O.) That said, it sounds to me like your enclosure is actually powering down the drive. If so, it ought to stop responding to selection, and I/O should fail in a "hard" way within 250 ms (or less, depending on whether you've got a SCSI bus which supports QAS, as the newer, faster versions do). This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
