Hello,
I've got a Sun 3510 disk array and a dual-channel Qlogic FC HBA, in a
Sun X4100 under RHEL4 U4, each path connected to the array over a
qlogic 5600 switch.
The devices are seen correctly with multipath -l as far as I can judge.
When I disable one of the paths during a stress test (in this case, an
fsck -y), the system "freezes". Actually, it just sends enough
(thousands) error messages of the style
end_request: I/O error, dev sdb, sector 279446024
Buffer I/O error on device sdb1, logical block 279445961
lost page write due to I/O error on sdb1
SCSI error : <1 0 0 1> return code = 0x10000
end_request: I/O error, dev sdb, sector 279446025
Buffer I/O error on device sdb1, logical block 279445962
lost page write due to I/O error on sdb1
SCSI error : <1 0 0 1> return code = 0x10000
end_request: I/O error, dev sdb, sector 279446026
Buffer I/O error on device sdb1, logical block 279445963
lost page write due to I/O error on sdb1
SCSI error : <1 0 0 1> return code = 0x10000
end_request: I/O error, dev sdb, sector 279446027
Buffer I/O error on device sdb1, logical block 279445964
lost page write due to I/O error on sdb1
SCSI error : <1 0 0 1> return code = 0x10000
to the serial console to make it appear completely stuck for hours.
The fsck does not finish, BTW, it restarts from the beginning as soon
as I re-enable the port in the switch.
root@afs26 ~]# multipath -l
mpath2 (3600c0ff0000000000a792a1887b34100)
[size=136 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [active]
\_ 1:0:0:3 sdc 8:32 [active][ready]
\_ 2:0:0:3 sdi 8:128 [active][ready]
mpath1 (3600c0ff0000000000a792a0aac9b4200)
[size=136 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [active]
\_ 1:0:0:1 sdb 8:16 [active][ready]
\_ 2:0:0:1 sdh 8:112 [active][ready]
....
/etc/multipath.conf just contains
defaults {
default_features "1 queue_if_no_path"
user_friendly_names yes
}
besides the usual blacklist.
Any ideas?
--
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Rainer Toebbicke
European Laboratory for Particle Physics(CERN) - Geneva, Switzerland
Phone: +41 22 767 8985 Fax: +41 22 767 7155
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