I have to agree - the udev way is the way to go (I fought it a long time
too...)
I did have problems getting a unique UUID from it, though, especially
when using multipathd. But if you add a custom getuid_callout (this is
defined in multipath.conf) script that calls udevinfo, you can get
multipathd to assign sensible names of multipath devices under
/dev/mapper. The two seem to work very well together for me, and has
solved my issues with reordering on reboots.
If it helps anyone, my getuid_callout is a script called 'get_iqn.sh'
that looks like this:
#!/bin/sh
DEVICE=$1
udevinfo -q env -n /dev/$DEVICE | grep iqn 2>&1 > /dev/null
if [ $? == 0 ]; then
udevinfo -q env -n /dev/$DEVICE | grep ID_PATH | sed 's/.*XYZ\.//' |
sed 's/-lun-/:/'
else
/sbin/scsi_id -g -u -s /block/$DEVICE
fi
Where XYZ is the prefix for all of our iscsi host names. You'll have to
tweak this if you are looking to do the same thing.
Cheers,
-Ty!
Erik Bussink wrote:
> On Thu, 2008-01-17 at 15:18 +0100, Klemens Kittan wrote:
>
>> My question is -- will this be the order even if i reboot?
>> Obviously the order of the nodes defines the order of the session. Will
>> allways it be the same order?
>>
>
> I don't think you can get a guarantee to always have the same ordering.
>
> It is much easier to create a custom udev rules.
>
> /etc/udev/rules.d/75-custom.rules
>
> KERNEL=="sd[b-z][1-9]" BUS=="scsi" SYSFS{serial}=="00000000014defbe2755"
> NAME="iscsi1" SYMLINK+="some_name1"
> KERNEL=="sd[b-z][1-9]" BUS=="scsi" SYSFS{serial}=="00000000014defbe2756"
> NAME="iscsi2" SYMLINK+="some_name2"
> KERNEL=="sd[b-z][1-9]" BUS=="scsi" SYSFS{serial}=="00000000014defbe2757"
> NAME="iscsi3" SYMLINK+="some_name3"
> KERNEL=="sd[b-z][1-9]" BUS=="scsi" SYSFS{serial}=="00000000014defbe2758"
> NAME="iscsi4" SYMLINK+="some_name4"
>
> And get the SYSFS number from you're iSCSI disk using the udevinfo
> command.
>
> udevinfo -a -p $(udevinfo -q path -n /dev/sdd)
>
> udev gives you a lot of flexibility. Give it a try.
>
> Regards,
> Erik
>
>
>
>
> >
>
--
-===========================-
Ty! Boyack
NREL Unix Network Manager
[EMAIL PROTECTED]
(970) 491-1186
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