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RE: [dm-devel] RE: Problem with multipathd and a blacklisted device



Here is the 'multipath -ll' output before disk was pulled:

 /root> ls -l /dev/hpdev
total 0
lrwxrwxrwx 1 root root 7 Mar 24 11:53 sda1 -> ../sdm1
lrwxrwxrwx 1 root root 7 Mar 24 11:53 sdb1 -> ../sdn1
/root> multipath -ll
multisde (35000c5000a41e633) dm-2 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:5:0  sde 8:64   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:19:0 sdq 65:0   [active][ready]
35000c5000a41e44bdm-5 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:8:0  sdh 8:112  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:22:0 sdt 65:48  [active][ready]
multisdc (35000c5000a41f38f) dm-0 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:3:0  sdc 8:32   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:17:0 sdo 8:224  [active][ready]
35000c5000a41e9bbdm-7 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:10:0 sdj 8:144  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:24:0 sdv 65:80  [active][ready]
35000c50004acb2cfdm-1 HP,DF0300B8053
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:4:0  sdd 8:48   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:18:0 sdp 8:240  [active][ready]
35000c5000a41f1b3dm-4 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:7:0  sdg 8:96   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:21:0 sds 65:32  [active][ready]
35000c5000a41f997dm-9 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:12:0 sdl 8:176  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:26:0 sdx 65:112 [active][ready]
35000c5000a41f37fdm-6 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:9:0  sdi 8:128  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:23:0 sdu 65:64  [active][ready]
35000c5000a41e0efdm-8 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:11:0 sdk 8:160  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:25:0 sdw 65:96  [active][ready]
multisdf (35000c5000a41f007) dm-3 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:6:0  sdf 8:80   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:20:0 sdr 65:16  [active][ready]
/root>

Now once the disk has been pulled and the path to the device is lost:

/root> ls -l /dev/hpdev
total 0
lrwxrwxrwx 1 root root 7 Mar 24 11:53 sdb1 -> ../sdn1
/root> multipath -ll
multisde (35000c5000a41e633) dm-2 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:5:0  sde 8:64   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:19:0 sdq 65:0   [active][ready]
35000c5000a41e44bdm-5 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:8:0  sdh 8:112  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:22:0 sdt 65:48  [active][ready]
multisdc (35000c5000a41f38f) dm-0 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:3:0  sdc 8:32   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:17:0 sdo 8:224  [active][ready]
35000c5000a41e9bbdm-7 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:10:0 sdj 8:144  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:24:0 sdv 65:80  [active][ready]
35000c50004acb2cfdm-1 HP,DF0300B8053
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:4:0  sdd 8:48   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:18:0 sdp 8:240  [active][ready]
35000c5000a41f1b3dm-4 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:7:0  sdg 8:96   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:21:0 sds 65:32  [active][ready]
35000c5000a41f997dm-9 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:12:0 sdl 8:176  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:26:0 sdx 65:112 [active][ready]
35000c5000a41f37fdm-6 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:9:0  sdi 8:128  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:23:0 sdu 65:64  [active][ready]
35000c5000a41e0efdm-8 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:11:0 sdk 8:160  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:25:0 sdw 65:96  [active][ready]
multisdf (35000c5000a41f007) dm-3 HP,DF300BB6C3
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:6:0  sdf 8:80   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:20:0 sdr 65:16  [active][ready]
/root>

Please let me know if there is any other information that you require from the node.  Thank you.

Lori

> -----Original Message-----
> From: dm-devel-bounces redhat com
> [mailto:dm-devel-bounces redhat com] On Behalf Of malahal us ibm com
> Sent: Tuesday, March 24, 2009 9:42 AM
> To: dm-devel redhat com
> Subject: Re: [dm-devel] RE: Problem with multipathd and a
> blacklisted device
>
> Ransegnola, Lori [Lori Ransegnola hp com] wrote:
> > I sent this question last week and have not heard a thing.
> Do you have a suggestion of a better mailing list that I
> should use for this question?
> >
> > Thank you.
> >
> > Lori
> >
> > > -----Original Message-----
> > > From: Ransegnola, Lori
> > > Sent: Thursday, March 19, 2009 3:51 PM
> > > To: dm-devel redhat com
> > > Cc: Ransegnola, Lori
> > > Subject: Problem with multipathd and a blacklisted device
> > >
> > > Configuration:
> > > --------------
> > >
> > > I have a multipath configuration set up where 10 disks are
> > > multipathed and 2 disks are blacklisted and are not multipathed.
> > > Here are the relevant parts of the multipath.conf file:
> > >
> > > defaults {
> > >         udev_dir                /dev
> > >         polling_interval        10
> > >         selector                "round-robin 0"
> > > #       path_grouping_policy    multibus
> > >         getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
> > >         prio_callout            /bin/true
> > > #       path_checker            readsector0
> > >         path_checker            tur
> > >         rr_min_io               100
> > >         rr_weight               priorities
> > >         failback                immediate
> > >         no_path_retry           fail
> > >         user_friendly_name      yes
> > > }
> > >
> > > blacklist {
> > > #       wwid 26353900f02796769
> > > #       devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
> > > #       devnode "^hd[a-z]"
> > >         wwid                    35000c5000a41f72b
> > >         wwid                    35000c5000a41f98b
> > >         devnode "^cciss!c[0-9]d[0-9]*"
> > > }
> > >
> > >
> > > The two disks that are not multipathed have udev rules
> and are part
> > > of a software RAID set.  The devices show up as
> > >
> > > /etc/udev/rules.d> ls -l /dev/hpdev
> > > total 0
> > > lrwxrwxrwx 1 root root 7 Mar 18 10:50 sda1 -> ../sda1
> lrwxrwxrwx 1
> > > root root 7 Mar 18 03:32 sdb1 -> ../sdb1
> > >
> > > /dev/md0 is created with sda and sdb.  Here is the bottom of the
> > > 'mdadm --detail /dev/md0' output:
> > >
> > > /root> mdadm --detail /dev/md0
> > > /dev/md0:
> > >         Version
> > > ...
> > > Failed Devices : 0
> > >   Spare Devices : 0
> > >
> > >            UUID : 94813396:a3e341fc:c5d4b8ba:0617a019
> > >          Events : 0.84
> > >
> > >     Number   Major   Minor   RaidDevice State
> > >        0       8        1        0      active sync   /dev/sda1
> > >        1       8       17        1      active sync   /dev/sdb1
> > > /root>
> > >
> > > I am running on a Linux RHEL5 U2 system.
> > > /etc/udev/rules.d> uname -a
> > > Linux n0 2.6.18-53.el5 #1 SMP Wed Oct 10 16:34:19 EDT 2007
> > > x86_64 x86_64 x86_64 GNU/Linux /etc/udev/rules.d> multipath -v
> > > Missing option arguement multipath-tools v0.4.7 (03/12, 2006)
> > > ----------------------------
> > >
> > > Problem:
> > >
> > > This configuration works well until I do some failure
> testing with
> > > one of the 2 blacklisted devs in the software RAID set.
> > > I found that if I temporarily remove disk sda and put it back a
> > > minute later the disk path, /dev/hpdev/sda1, is removed,
> even though
> > > it is blacklisted.
>
> What is 'multipath -ll' output before you remove the
> blacklisted device?
> What is 'multipath -ll' output after you put the device back
> a minute later?
>
> Thanks, Malahal.
>
> --
> dm-devel mailing list
> dm-devel redhat com
> https://www.redhat.com/mailman/listinfo/dm-devel
>


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