Eliminating the local disk /dev/sda by adding it to blacklist solved the problem of segmentation fault during boot up. blacklist { devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*" devnode "^(hd|xvd)[a-z]*" devnode "sda" wwid "*" } I am currently importing the database to check for path failures during load. It takes about 12 hours to complete, but we had no path failures so far. I will get "multipathd -v9 -d" after the import is complete. # multipathd -v9 -d Oct 24 08:38:39 | --------start up-------- Oct 24 08:38:39 | read /etc/multipath.conf Oct 24 08:38:39 | process is already running Thanks, Prakash. -----Original Message----- From: dm-devel-bounces@xxxxxxxxxx [mailto:dm-devel-bounces@xxxxxxxxxx] On Behalf Of Konrad Rzeszutek Sent: Friday, October 24, 2008 6:31 AM To: device-mapper development Subject: Re: multipathd segfault and SCSI errors > multipathd[7165]: segfault at 000000000000000a rip 00002aaaaaf51a3d rsp 00007fff03b50090 error 4 Can you run multipathd as so: multipathd -v9 -d And provide the -200 lines output from the segfault output? You might need to edit the /etc/init.d/multipathd to have this work and pipe the output to a log file or so. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel