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Problem description:
procedure:
echo 1 > /sys/bus/ccw/devices/0.0.0199/online
/sbin/chzdev dasd-eckd 0199 -e -p
/sbin/dasdfmt -b 4096 -d cdl -f /dev/disk/by-path/ccw-0.0.0199 -y
dasdfmt fails with:
/sbin/dasdfmt: Unable to open device /dev/disk/by-path/ccw-0.0.0199: No such
device
looking at the syslog i can see a strange message that only comes out when i am
having this issue:
Nov 21 08:52:12 JUUB16MS kernel: [ 67.412484] dasd-eckd 0.0.0199: The disk
layout of the DASD is not supported
lsdasd returns:
root@JUUB16MS:~# lsdasd
Bus-ID Status Name Device Type BlkSz Size Blocks
==============================================================================
0.0.0192 active dasda 94:0 ECKD 4096 5070MB 1298160
0.0.0195 active dasdb 94:4 FBA 512 40MB 81920
0.0.0193 n/f dasdc 94:8 ECKD
0.0.0196 active dasdd 94:12 FBA 512 40MB 81920
0.0.0194 n/f dasde 94:16 ECKD
0.0.0197 n/f dasdf 94:20 ECKD
0.0.0198 n/f dasdg 94:24 ECKD
0.0.0199 n/f dasdh 94:28 ECKD
you can see that the 199 is not format and can't be formatted...
a workaround is to vary the disk offline and then online again.
this time it will start ok and you can format it and work with it.
------------------------------
just to be clear... this happens after linking to an un-formatted disk
dynamically and then vary it online...
for example:
vmcp link '*' 199 199
echo 1 > /sys/bus/ccw/devices/0.0.0199/online
/sbin/chzdev dasd-eckd 0199 -e -p
/sbin/dasdfmt -b 4096 -d cdl -f /dev/disk/by-path/ccw-0.0.0199 -y
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-148980 severity-high
targetmilestone-inin1704
--
dasdfmt fails after vary online. syslog show strange message "The disk layout
of the DASD is not supported"
https://bugs.launchpad.net/bugs/1643527
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