[dm-devel] Re: EMC Cx300 multipath seems to work

[Nicola Murino]

gistolero at gmx.de ha scritto:

> Hi Nicola,
>
> Nicola Murino wrote:
>
>> Hi,
>>
>> multipath seems to work on gentoo, I have to load the modules in proper
>> order, this is my configuration:
>>
>> cat /etc/conf.d/local.start
>> # /etc/conf.d/local.start
>>
>> # This is a good place to load any misc programs
>> # on startup ( use 1>&2 to hide output)
>> /sbin/modprobe dm-emc
>> /sbin/modprobe qla2300
>> /bin/sleep 5
>> /sbin/udevstart
>> /etc/init.d/multipathd start
>>
>> is critical the command udevstart without only one path is seen,
>
>
>
> After rebooting my system, I see only one path always:
>
> testhalde2 ~ # multipath -l
> 150gb ()
> [size=150 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [active]
>  \_ 0:0:0:1 sda 8:0  [active]
>
>
> I have to run multipath again:
>
> testhalde2 ~ # multipath /dev/sda
> reload: 150gb (3600508b40010079d0001900000460000)
> [size=150 GB][features="0"][hwhandler="0"]
> \_ round-robin 0
>  \_ 0:0:0:1 sda 8:0  [active][ready]
>  \_ 1:0:0:1 sdb 8:16 [ready]
>
>
Yes, after reboot I see only one path too, but when I run udevstart I
see all paths, for this reason I put udevstart in /etc/conf.d/local.start

>> I experienced a kernel oops with kernel-2.6.12 (both vanilla-sources and
>> gentoo-sources) when I load qla2300 module, here are the logs:
>
>
> I'm using a HP DL-380 G3 Proliant + Qlogic QLA 2340 (qla2300) with
> 2.6.12.5 (vanilla). No kernel oops here.
>
I have qlogic 2322 and I must load dm-emc too, however
kernel-2.6.13-gentoo-r1 works fine

>
>> P.S. for gistolero, I haven't your problem with multipathd (or so seems)
>> however my hardware is different, I think also that the need to run
>> udevstart is a gentoo bug, today gentoo has releases udev-0.68-r1 with
>> start-stop script, if you read start script there is udevstart, however
>> I haven't yet tested this script because they require unstable
>> baselayout-1.12
>
>
> The same behavior with udev-068-r1. I don't think that this is a
> gentoo bug, because distributions differ in udev _startup_ scripts
> only. I know that I have to run udevstart after creating a new
> udev.rules in /etc/udev/rules/. But  after this, udev should parse
> this rule after every change:
>
>
udev 0.68-r1 needs unstable baselayout (1.12) to execute udev-start.sh,
what baselayout are you using?

>
> After reboot...
>
> testhalde2 ~ # ls -lF /dev/mapper/
> brw-------  1 root root 254,  0 Sep 13  2005 150gb
> brw-------  1 root root 254,  1 Sep 13  2005 150gb1
> brw-------  1 root root 254,  2 Sep 13  2005 150gb2
> crw-rw----  1 root root  10, 63 Sep 13  2005 control
> testhalde2 ~ # ls -lF /dev/1*
> lrwxrwxrwx  1 root root 4 Sep 13  2005 /dev/150gb2 -> dm-2
>
> testhalde2 ~ # udevstart
>
> testhalde2 ~ # ls -lF /dev/1*
> lrwxrwxrwx  1 root root 4 Sep 13 13:00 /dev/150gb -> dm-0
> lrwxrwxrwx  1 root root 4 Sep 13 13:00 /dev/150gb1 -> dm-1
> lrwxrwxrwx  1 root root 4 Sep 13 13:00 /dev/150gb2 -> dm-2
>
> Ok, udev knows the multipath udev-rule and creates this links.
>
>
>
> Deleting the multipath-table...
>
> testhalde2 ~ # dmsetup table
> 150gb1: 0 64197 linear 254:0 63
> 150gb: 0 314572800 multipath 0 0 1 1 round-robin 0 2 1 8:0 1000 8:16 1000
> 150gb2: 0 314504505 linear 254:0 64260
>
> testhalde2 ~ # dmsetup remove 150gb1
> testhalde2 ~ # dmsetup remove 150gb2
> testhalde2 ~ # dmsetup remove 150gb
> testhalde2 ~ # dmsetup table
> No devices found
>
> testhalde2 ~ # ls -lF /dev/mapper/
> total 0
> crw-rw----  1 root root 10, 63 Sep 13  2005 control
>
> testhalde2 ~ # ls -lF /dev/1*
> ls: /dev/1*: No such file or directory
>
>
>
> Creating the multipath-table...
>
> testhalde2 ~ # multipath /dev/sda
> create: 150gb (3600508b40010079d0001900000460000)
> [size=150 GB][features="0"][hwhandler="0"]
> \_ round-robin 0
>  \_ 0:0:0:1 sda 8:0  [ready]
>  \_ 1:0:0:1 sdb 8:16 [ready]
>
> testhalde2 ~ # ls -lF /dev/mapper/
> total 0
> brw-------  1 root root 254,  0 Sep 13 13:04 150gb
> brw-------  1 root root 254,  1 Sep 13 13:04 150gb1
> brw-------  1 root root 254,  2 Sep 13 13:04 150gb2
> crw-rw----  1 root root  10, 63 Sep 13  2005 control
>
> testhalde2 ~ # ls -lF /dev/1*
> ls: /dev/1*: No such file or directory
>
>
> No links in /dev/... I don't understand this, because
> udev should read the multipath udev-rule again.
> Perhaps I'm mistaken?
>
> Simon
>
> -- 
> dm-devel mailing list
> dm-devel at redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>