topic Re: vgcreate problems in Operating System - HP-UX

vgcreate problems

dictum9 — Mon, 23 Mar 2009 20:26:29 GMT

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
#

Re: vgcreate problems

Patrick Wallek — Mon, 23 Mar 2009 20:32:29 GMT

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.

Re: vgcreate problems

dictum9 — Mon, 23 Mar 2009 20:47:58 GMT

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.

Re: vgcreate problems

James R. Ferguson — Mon, 23 Mar 2009 20:50:53 GMT

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...

Re: vgcreate problems

Roland Piette — Tue, 24 Mar 2009 07:27:10 GMT

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.

Re: vgcreate problems

Sharma Sanjeev — Tue, 24 Mar 2009 07:43:16 GMT

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

Re: vgcreate problems

Suraj K Sankari — Tue, 24 Mar 2009 07:53:39 GMT

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

Re: vgcreate problems

Sajjad Sahir — Wed, 25 Mar 2009 05:36:35 GMT

Dear etc
Surely u can use all these minor numbers

the condition is it should be unique and hex

decimal

thanks and regards

sajjad

Re: vgcreate problems

dictum9 — Thu, 26 Mar 2009 12:28:08 GMT

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

Re: vgcreate problems

James R. Ferguson — Thu, 26 Mar 2009 12:33:12 GMT

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...

Re: vgcreate problems

dictum9 — Thu, 26 Mar 2009 17:35:29 GMT

Thanks for pointing that out.