[dm-devel] Re: two paths remain failed on DS6800 after code upgrade

[Gianluca Cecchi]

It seems I solved the problem removing the disks and then adding them, with
the commands:

for sdc
remove:*
echo "1" > /sys/class/scsi_host/host0/device/target0:0:1/0:0:1:0/delete*
**
To reregister the disk with the kernel used the command:***
echo "0 1 0" > /sys/class/scsi_host/host0/scan*

for sdd
remove:*
echo "1" > /sys/class/scsi_host/host0/device/target0:0:1/0:0:1:1/delete*
**
To reregister the disk with the kernel used the command:***
echo "0 1 1" > /sys/class/scsi_host/host0/scan*

In general
deregister*
echo "1" > /sys/class/scsi_host/hostH/device/targetH:B:T/H:B:T:L/delete* To
reregister the disk with the kernel:*
echo "B T L" > /sys/class/scsi_host/hostH/scan

* Device name persistence not granted. In my case
sdc --> sdi
sdd --> sdd

All operations were transparent and with no downtime.
I also removed other disks and then readded (also during I/O using them) and
I have to say that multipath seems very robust.
Thanks to the developers.
HIH for others.
Still I don't understand why  it was before unable to reinstate the path.
Gianluca
**
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