mknod ?? minor and major?

[Deanna Tran_1]

when creating the special file...we
use the minor and major number ? how are those number play the role in vgcreate a volume group?
what does 64 means in major number and 0x010000 in minore means?
because i ran into this error when i tried to
do vgcreate
"can't open the control file"..a.nd when i deleted it again..it works...fine...and somehow helps me to explan this?

[Michael Tully · Accepted solution]

Not sure exactly what you mean.

64 is the major number reporesentation for the LVM driver.

# lsdev | grep lvm
64 64 lv lvm

The minor number represents the group file of the volume group being created. If you have used the first 10 minor numbers, i.e. 10 volume groups, there is a kernel parameter for this called 'maxvgs' that must be increased.

[T G Manikandan]

Hello,

check these docs


http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90698/B2355-90698_top.html&con=/hpux/onlinedocs/B2355-90698/00/00/77-con.html&toc=/hpux/onlinedocs/B2355-90698/00/00/77-toc.html&searchterms=minor%7cmajor&queryid=20020801-224806

[Pierce Byrne_1]

In simple terms -
The major number 64 lets hpux know its a volume group.
The minor number groups all the logical volumes within a volume group. The 1st two digits in the minor number identify the volume group and the final two the logical volume within the volume group.