On Fri, Nov 24, 2006 at 12:39:16PM +0100, Claudio Tassini wrote:
> Hi all
>
> I'm trying to understand how dm works on a RHEL 4u4, ( and RHCS and GFS
> too). I have two QLC HBAs connected to a Sun Storage 3510 via a couple of
> SANBOX2 switches. Initially I uncommented all the entries in the
> configuration file to make some test and I manage to discover the three
> luns which where recognized correctly whit their path:
>
> [root@store1 ~]# multipath -ll
> 3600c0ff00000000009897a30ae0b0401
> [size=369 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:1:1 sde 8:64 [active][ready]
> \_ 2:0:1:1 sdh 8:112 [active][ready]
>
> 3600c0ff00000000009897a30ae0b0400
> [size=40 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:1:0 sdd 8:48 [active][ready]
> \_ 2:0:1:0 sdg 8:96 [active][ready]
>
> 3600c0ff00000000009897a5a29e3f800
> [size=1091 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:0:0 sdc 8:32 [active][ready]
> \_ 2:0:0:0 sdf 8:80 [active][ready]
>
> Now, the problem is:
> 1) the default configuration should provide a failover policy, but it
> seems that it is actually using an active-active one
Your problem is that the compiled in default configuration for the SUN
StorEdge 3510 is 'multibus' (active-active). To see what compiled in defaults
are, look in:
/usr/share/doc/device-mapper-multipath-0.4.5/multipath.conf.defaults
You will see
...
devices {
...
device {
vendor "SUN"
product "StorEdge 3510"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s"
}
...
}
> 2) Any change I make to /etc/multipath.conf , the output of multipath -ll
> remains the same. Also tried to flush and reload, restart the daemon etc..
> Always the same.
To change this, you need to override the compiled in defaults for your SUN
controllers. Put the following lines in your /etc/multipath.conf
devices {
device {
vendor "SUN"
product "StorEdge 3510"
path_grouping_policy failover
getuid_callout "/sbin/scsi_id -g -u -s"
}
}
> 3) If even I REMOVE the configuration file and reboot the server, it keeps
> discovering the same paths! :
>
> [root@store1 ~]# ls /etc/multipath.conf
> ls: /etc/multipath.conf: No such file or directory
> [root@store1 ~]# multipath -ll
> 3600c0ff00000000009897a30ae0b0401
> [size=369 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:1:1 sde 8:64 [active][ready]
> \_ 2:0:1:1 sdh 8:112 [active][ready]
>
> 3600c0ff00000000009897a30ae0b0400
> [size=40 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:1:0 sdd 8:48 [active][ready]
> \_ 2:0:1:0 sdg 8:96 [active][ready]
>
> 3600c0ff00000000009897a5a29e3f800
> [size=1091 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:0:0 sdc 8:32 [active][ready]
> \_ 2:0:0:0 sdf 8:80 [active][ready]
> [root@store1 ~]# multipath -v2 -F
> [root@store1 ~]#
> [root@store1 ~]# multipath -ll
> [root@store1 ~]#
> [root@store1 ~]# /etc/init.d/multipathd restart
> Stopping multipathd daemon: [ OK ]
> Starting multipathd daemon: [ OK ]
> [root@store1 ~]#
> [root@store1 ~]# multipath -v2 -ll
> [root@store1 ~]# multipath -v2 -d
> create: SSEAGATE_ST973401LSUN72G0210CB0H____________3LB0CB0H
> [size=68 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=1]
> \_ 0:0:0:0 sda 8:0 [ready]
>
> create: SSEAGATE_ST973401LSUN72G0210BTPF____________3LB0BTPF
> [size=68 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=1]
> \_ 0:0:1:0 sdb 8:16 [ready]
>
> create: 3600c0ff00000000009897a5a29e3f800
> [size=1091 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2]
> \_ 1:0:0:0 sdc 8:32 [ready]
> \_ 2:0:0:0 sdf 8:80 [ready]
>
> create: 3600c0ff00000000009897a30ae0b0400
> [size=40 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2]
> \_ 1:0:1:0 sdd 8:48 [ready]
> \_ 2:0:1:0 sdg 8:96 [ready]
>
> create: 3600c0ff00000000009897a30ae0b0401
> [size=369 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2]
> \_ 1:0:1:1 sde 8:64 [ready]
> \_ 2:0:1:1 sdh 8:112 [ready]
> [root@store1 ~]# multipath -v2 -ll
> [root@store1 ~]# multipath -v2
> create: 3600c0ff00000000009897a5a29e3f800
> [size=1091 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2]
> \_ 1:0:0:0 sdc 8:32 [ready]
> \_ 2:0:0:0 sdf 8:80 [ready]
>
> create: 3600c0ff00000000009897a30ae0b0400
> [size=40 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2]
> \_ 1:0:1:0 sdd 8:48 [ready]
> \_ 2:0:1:0 sdg 8:96 [ready]
>
> create: 3600c0ff00000000009897a30ae0b0401
> [size=369 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2]
> \_ 1:0:1:1 sde 8:64 [ready]
> \_ 2:0:1:1 sdh 8:112 [ready]
>
> [root@store1 ~]# multipath -v2 -ll
> 3600c0ff00000000009897a30ae0b0401
> [size=369 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:1:1 sde 8:64 [active][ready]
> \_ 2:0:1:1 sdh 8:112 [active][ready]
>
> 3600c0ff00000000009897a30ae0b0400
> [size=40 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:1:0 sdd 8:48 [active][ready]
> \_ 2:0:1:0 sdg 8:96 [active][ready]
>
> 3600c0ff00000000009897a5a29e3f800
> [size=1091 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [prio=2][active]
> \_ 1:0:0:0 sdc 8:32 [active][ready]
> \_ 2:0:0:0 sdf 8:80 [active][ready]
>
> [root@store1 ~]#
>
> How is it possible??
>
> Thanks in advance
>
> --
> Claudio Tassini
> --
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> dm-devel@xxxxxxxxxx
> https://www.redhat.com/mailman/listinfo/dm-devel
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