Re: [dm-devel] multipath/gfs lockout under heavy write

[Guy Coates <gmpc sanger ac uk>]

FWIW,  I'm running LVM on top of device mapper to HSV110s,
and it seems to work.

This is my  multipath.conf


devices {
device {
vendor "COMPAQ  "
product "HSV110 (C)COMPAQ"
path_selector           "round-robin 0"
path_grouping_policy "group_by_serial"
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker "readsector 0"
#path_checker "tur"
#features "1 queue_if_no_path"
}
}

You might want to try the "readsector 0" checker rather than the
test-unit-ready one. As others have pointed out, if you are running the
qlogic driver then setting

#define QL_DEBUG_LEVEL_2

in drivers/scsi/qla2xxx/qla_dbg.h

makes the driver print out some more useful scsi information.


Guy

-- 
Dr. Guy Coates,  Informatics System Group
The Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1SA, UK
Tel: +44 (0)1223 834244 ex 7199