PERC5 (LSI MegaSAS) Patrol Read crashes

Sean McAfee smcafee at
Mon Oct 1 14:25:43 PDT 2007

John Baldwin wrote:
> On Saturday 29 September 2007 09:18:17 pm Benjie Chen wrote:
> Hmm, I haven't tried with megacli, but an internal tool at work is able to 
> start manual patrol reads w/o causing a crash, and I've also seen production 
> boxes running automatic patrol reads w/o causing crashes.  Do you have to 
> have a certain load before it will crash?

The crashes that we've seen in production have occurred while patrol 
reads kick off under moderate-high load, but in testing, an automatic 
read will complete fine.  Even with maxed-out I/O*, we haven't been able 
to come up with reliable testing scenario to trigger crashes on 
automatic patrol reads.

(*My base testing scenario involved running a pretty heavy stress [as in 
the program available in ports], while repeatedly copying ports & src 
from an NFS mount to another local mountpoint and SCPing a large file in 
a loop from another machine.)

Sean McAfee
Collaborative Fusion, Inc.
  smcafee at
  412-422-3463 x 4025

1710 Murray Avenue, Suite 320
Pittsburgh, PA 15217

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