On Fri, 15 Feb 2008, Peter Tribble wrote:
> Each LUN is accessed through only one of the controllers (I presume the
> 2540 works the same way as the 2530 and 61X0 arrays). The paths are
> active/passive (if the active fails it will relocate to the other path).
> When I set mine up the first time it allocated all the LUNs to controller B
> and performance was terrible. I then manually transferred half the LUNs
> to controller A and it started to fly.
I assume that you either altered the "Access State" shown for the LUN
in the output of 'mpathadm show lu DEVICE' or you noticed and
observed the pattern:
Target Port Groups:
ID: 3
Explicit Failover: yes
Access State: active
Target Ports:
Name: 200400a0b83a8a0c
Relative ID: 0
ID: 2
Explicit Failover: yes
Access State: standby
Target Ports:
Name: 200500a0b83a8a0c
Relative ID: 0
I find this all very interesting and illuminating:
for dev in c4t600A0B80003A8A0B0000096A47B4559Ed0 \
c4t600A0B80003A8A0B0000096E47B456DAd0 \
c4t600A0B80003A8A0B0000096147B451BEd0 \
c4t600A0B80003A8A0B0000096647B453CEd0 \
c4t600A0B80003A8A0B0000097347B457D4d0 \
c4t600A0B800039C9B500000A9C47B4522Dd0 \
c4t600A0B800039C9B500000AA047B4529Bd0 \
c4t600A0B800039C9B500000AA447B4544Fd0 \
c4t600A0B800039C9B500000AA847B45605d0 \
c4t600A0B800039C9B500000AAC47B45739d0 \
c4t600A0B800039C9B500000AB047B457ADd0 \
c4t600A0B800039C9B500000AB447B4595Fd0 \
do
echo "=== $dev ==="
for> mpathadm show lu /dev/rdsk/$dev | grep 'Access State'
for> done
=== c4t600A0B80003A8A0B0000096A47B4559Ed0 ===
Access State: active
Access State: standby
=== c4t600A0B80003A8A0B0000096E47B456DAd0 ===
Access State: active
Access State: standby
=== c4t600A0B80003A8A0B0000096147B451BEd0 ===
Access State: active
Access State: standby
=== c4t600A0B80003A8A0B0000096647B453CEd0 ===
Access State: active
Access State: standby
=== c4t600A0B80003A8A0B0000097347B457D4d0 ===
Access State: active
Access State: standby
=== c4t600A0B800039C9B500000A9C47B4522Dd0 ===
Access State: active
Access State: standby
=== c4t600A0B800039C9B500000AA047B4529Bd0 ===
Access State: standby
Access State: active
=== c4t600A0B800039C9B500000AA447B4544Fd0 ===
Access State: standby
Access State: active
=== c4t600A0B800039C9B500000AA847B45605d0 ===
Access State: standby
Access State: active
=== c4t600A0B800039C9B500000AAC47B45739d0 ===
Access State: standby
Access State: active
=== c4t600A0B800039C9B500000AB047B457ADd0 ===
Access State: standby
Access State: active
=== c4t600A0B800039C9B500000AB447B4595Fd0 ===
Access State: standby
Access State: active
Notice that the first six LUNs are active to one controller while the
second six LUNs are active to the other controller. Based on this, I
should rebuild my pool by splitting my mirrors across this boundary.
I am really happy that ZFS makes such things easy to try out.
Bob
======================================
Bob Friesenhahn
[EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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