Package: multipath-tools
Version: 0.4.7-1
The multipath tool dies (exit code is 1) whenever I have a particular cheap
USB drive plugged in. Digging a bit with strace shows:
<snip>
open("/sys/block/sdx/dev", O_RDONLY) = 26
read(26, "65:112\n", 4096) = 7
close(26) = 0
stat64("/sys/block/sdx/size", {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
open("/sys/block/sdx/size", O_RDONLY) = 26
read(26, "160086528\n", 4096) = 10
close(26) = 0
stat64("/sys/block/sdx/device/vendor", {st_mode=S_IFREG|0444,
st_size=4096, ...}) = 0
open("/sys/block/sdx/device/vendor", O_RDONLY) = 26
read(26, "Maxtor 4\n", 4096) = 9
close(26) = 0
stat64("/sys/block/sdx/device/model", {st_mode=S_IFREG|0444,
st_size=4096, ...}) = 0
open("/sys/block/sdx/device/model", O_RDONLY) = 26
read(26, "D080H4 \n", 4096) = 17
close(26) = 0
stat64("/sys/block/sdx/device/rev", {st_mode=S_IFREG|0444,
st_size=4096, ...}) = 0
open("/sys/block/sdx/device/rev", O_RDONLY) = 26
read(26, "\n", 4096) = 1
close(26) = 0
close(4) = 0
<snip>
Sure enough, /dev/sdx is a cheapo USB disk enclose, and sysfs doesn't report
a revision number for the drive.
If I unplug the USB disk, multipath works fine. My guess is that either
multipath itself, or maybe libsysfs, can't handle the existence of an
empty /sys/block/sdx/device/rev. If it matters, I'm using libsysfs2
2.0.0-6.
--
Mike Shuey
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