vgcreate problems

[dictum9]

Any idea what this vgcreate error means?

# mknod /dev/vgHitachiBWS/group c 64 0x110000 # ll /dev/*/group
crw-r----- 1 root sys 64 0x000000 Aug 29 2008 /dev/vg00/group
crw-r--r-- 1 root root 64 0x060000 Dec 1 14:52 /dev/vgHitachiBWD/group
crw-r--r-- 1 root root 64 0x020000 Dec 5 10:16 /dev/vgHitachiJPS/group
crw-r--r-- 1 root root 64 0x070000 Mar 12 10:59 /dev/vgHitachiSBX/group
crw-r--r-- 1 root root 64 0x080000 Dec 1 14:53 /dev/vgJPDsbx/group
crw-r--r-- 1 root root 64 0x090000 Dec 1 14:55 /dev/vgdevsap/group
crw-r--r-- 1 root root 64 0x030000 Oct 1 10:50 /dev/vgsbx/group

# mknod /dev/vgHitachiBWS/group c 64 0x110000

# vgcreate -s 32 -l 128 /dev/vgHitachiBWS /dev/dsk/c10t3d0
vgcreate: Cannot open the control file "/dev/vgHitachiBWS/group":
No such device
#

[Patrick Wallek · Accepted solution]

What is your MAXVGS kernel parameter set to?

If it is the default of 12, then you need to decrease the minor number you are using.

Remember the minor number is in HEX so a HEX 11 = decimas 17.

Try again with:

# rm /dev/vgHitachiBWS/group

# mknod /dev/vgHitachiBWS/group c 64 0x010000

Or you woulc use 04, 05, or 06.

[dictum9]

Yeah thanks -- I already came to realize that it was a problem,

maxvgs defaults to 10... Need to find time to reset it and bounce the box.

[James R. Ferguson]

Hi:

> maxvgs defaults to 10... Need to find time to reset it and bounce the box.

...which means that valid values range from 0x00 to 0x09 or 10 (decimal) volume groups.

Regards!

...JRF...

[Roland Piette]

Hi etc,

Is it really necessary to change the kernel parameter an dreboot ?

I see that group 0x010000, 0x040000 & 0x050000 are not used !

You can used them first and do need to reboot.

[Sharma Sanjeev]

Hi etc

Yes, Roland Piette is right here
you can use 0x010000, 0x040000 & 0x050000
for new VG as these are not in use as per the output you have pasted above.

So no reboot is required

Regards
Sanjeev

[Suraj K Sankari]

Hi,

Please assign some points who give there valuable time for your problem.

To know how to assign points please go through the below link.


http://forums13.itrc.hp.com/service/forums/helptips.do?#33

Suraj

[Sajjad Sahir]

Dear etc
Surely u can use all these minor numbers

the condition is it should be unique and hex

decimal


thanks and regards


sajjad

[dictum9]

I reset mxvgs kernel variable to "99" and rebooted, and now I can create more VGs.

[James R. Ferguson]

Hi (again):

For each increment in 'maxvgs' you will use about 4-8KB of physical memory. Hence, inflating it further than you need is a bit wasteful. Of course, in 11.31, the kernel tunable disappears...

Regards!

...JRF...

[dictum9]

Thanks for pointing that out.