Mknod Post: 302199765

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Operating Systems HP-UX Mknod Post 302199765 by Perderabo on Tuesday 27th of May 2008 09:54:09 PM

05-27-2008

Administrator Emeritus

mknod is a utility to make filesystem objects. In the case of LVM you might do:
mknod /dev/vgxyz/group c 64 0x030000

You can call a volume group vgxyz if you want, but you must have a file called "group" in it. This form of mknod is making a character special file. 64 is the number of the LVM driver. (lsdev can list drivers.) 0x030000 is a unique number that you must pick to identify the volume group to the kernel. To you it's the vgxyz volume group, but to the kernel, it's the 03 volume group. The group file connects /dev/xyz to the number 03. Anytime you do a vgchange or whatever, the vgchange command needs to let the kernel know what's happening and it talks to the group file to do that.

Cameron, you should be using mkfifo to make your fifo's. And fifo's (aka named pipes) have nothing to do with this.

Perderabo

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LEARN ABOUT MOJAVE

vgcfgbackup

VGCFGBACKUP(8)                                                System Manager's Manual                                               VGCFGBACKUP(8)

NAME

       vgcfgbackup - backup volume group descriptor area

SYNOPSIS

       vgcfgbackup [-d|--debug] [-f|--file filename] [-h|--help] [--ignorelockingfailure] [-P|--partial] [-v|--verbose] [VolumeGroupName...]

DESCRIPTION

       vgcfgbackup  allows you to backup the metadata of your volume groups.  If you don't name any volume groups on the command line, all of them
       will be backed up.

       In a default installation, each volume group gets backed up into a separate file bearing the name of the  volume  group  in  the  directory
       /etc/lvm/backup.   You can write the backup to an alternative file using -f.  In this case if you are backing up more than one volume group
       the filename is treated as a template, and %s gets replaced by the volume group name.

       NB. This DOESN'T backup user/system data in logical volume(s)!  Backup /etc/lvm regularly too.

OPTIONS

       See lvm for common options.

SEE ALSO

       lvm(8), vgcfgrestore(8)

Sistina Software UK                                      LVM TOOLS 2.02.95(2) (2012-03-06)                                          VGCFGBACKUP(8)