lvmpvg

[Luke Morgan]

Hi,

I have 4 disks that I want to make into a mirrored physical volume group.
The disks are in a fibre enclosure with two controllers.
Therefore, from ioscan I have 8 devices referring to these 4 disks.
/dev/dsk/c5t0d0
/dev/dsk/c5t1d0
/dev/dsk/c5t2d0
/dev/dsk/c5t3d0

/dev/dsk/c6t0d0
/dev/dsk/c6t1d0
/dev/dsk/c6t2d0
/dev/dsk/c6t3d0


When creating the physical volume groups in /etc/lvmpvg
should I alternate the controllers for the two disks like so :
VG /dev/vg01
PVG PVG1
/dev/dsk/c5t0d0
/dev/dsk/c6t1d0
PVG PVG1m
/dev/dsk/c5t2d0
/dev/dsk/c6t3d0

or put in the device files for each disk with both controllers like so?
VG /dev/vg01
PVG PVG1
/dev/dsk/c5t0d0
/dev/dsk/c6t0d0
/dev/dsk/c5t1d0
/dev/dsk/c6t1d0
PVG PVG1m
/dev/dsk/c5t2d0
/dev/dsk/c6t2d0
/dev/dsk/c5t3d0
/dev/dsk/c6t3d0

Thanks for your help

Luke

[Deoncia Grayson_1]

When creating your pvg file you should use the second option:
VG /dev/vg01
PVG PVG1
/dev/dsk/c5t0d0
/dev/dsk/c6t0d0
/dev/dsk/c5t1d0
/dev/dsk/c6t1d0
PVG PVG1m
/dev/dsk/c5t2d0
/dev/dsk/c6t2d0
/dev/dsk/c5t3d0
/dev/dsk/c6t3d0

this will ensure the mirror is going to the right disks and you have your alternate links to the disks listed as well.

[Matthew Ghofrani]

I would even go one step further and alternate between c5 and c6 in the second method between the controllers so that one disks' primary c is 5 while the second's primary c is 6 like so.

VG /dev/vg01
PVG PVG1
/dev/dsk/c5t0d0
/dev/dsk/c6t0d0
/dev/dsk/c6t1d0
/dev/dsk/c5t1d0
PVG PVG1m
/dev/dsk/c5t2d0
/dev/dsk/c6t2d0
/dev/dsk/c6t3d0
/dev/dsk/c5t3d0

Matthew From Boston