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
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.
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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