Red Hat Bugzilla – Bug 90181
System Hangs when scsi block size set to 1024 bytes during backup
Last modified: 2007-11-30 17:06:52 EST
Description of problem:
Dell 8 way processor, 8 gigs of memory (8250). I set the scsi block size to
1024 bytes to increase throughput, because I have 180 gigs to backup using an
LTO tape drive. I am using the dell symbios controller. After random backup
times (usually after 1 hour of backing up) the system hangs and must be power
cycled. I reduced the block size to 512 bytes and the problem disappeared.
Version-Release number of selected component (if applicable):
How reproducible: so far every time
Steps to Reproduce:
1. set scsi blocksize to 1024 bytes (env variable)
2. do a backup of 150+ gigs
3. after an hour or more the system will hang -requiring a power cycle. The
system was not observed to be cpu bound at any time (from top). No other
programs were running.
I will investigate and see if we can fix this in the next AS 2.1 update.
Please send the output of /var/log/messages that shows the boot-up messages. I
would like to see 1) the kernel version, 2) which Symbois driver and version is
being used. Also send any I/O errors that may be reported in the log during the
How exactly are you setting the scsi block size?
What are you using to do the backup?
Also, please send the output of lsmod.
No word on this for five months. Please reopen after retrying with the
latest kernel errata, and provide the requested information.