HP-UX logical volume structure


 
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Old 11-09-2005
HP-UX logical volume structure

HI, I am newbie to HP. I am working on HP visualise B1000 workstation.
In my project i have a need to read the logical vome structure,
I mean to say at the time of installation i create 5 logical vome like /,/var,/usr, /home, swap etc.with different sizes.
I am using a hexeditor for searching the Vxfs internal structure. I got a dsk_label_magic 0x8b7f6a3c at some sector number. In that structure i got two parameters one for /stand partition , its starting block number and its length and then i "/"(root) starting block number and its length.It has been verfied .
But after that i am unable to find the next partitions information like start of /home or /usr and their length.
i ma using the single hard disk.
Plaese tell how i got the information or any structure that define it.

Is there any structure like VTOC (volume table of contents) like in Unixware and solaris.

Regards
Sandy
 
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LVDISPLAY(8)						      System Manager's Manual						      LVDISPLAY(8)

NAME
lvdisplay - display attributes of a logical volume SYNOPSIS
lvdisplay [-a|--all] [-c|--colon] [-d|--debug] [-h|-?|--help] [--ignorelockingfailure] [--maps] [--nosuffix] [-P|--partial] [--units hHbB- sSkKmMgGtTpPeE] [-v|--verbose] [--version] [LogicalVolumePath [LogicalVolumePath...]] lvdisplay --columns | -C [--aligned] [-a|--all] [-d|--debug] [-h|-?|--help] [--ignorelockingfailure] [--noheadings] [--nosuffix] [-o|--options [+]Field[,Field]] [-O|--sort [+|-]Key1[,[+|-]Key2[,...]]] [-P|--partial] [--segments] [--separator Separator] [--unbuffered] [--units hHbBsSkKmMgGtTpPeE] [-v|--verbose] [--version] [LogicalVolumePath [LogicalVolumePath...]] DESCRIPTION
lvdisplay allows you to see the attributes of a logical volume like size, read/write status, snapshot information etc. lvs (8) is an alternative that provides the same information in the style of ps (1). lvs is recommended over lvdisplay. OPTIONS
See lvm for common options and lvs for options given with --columns. --all Include information in the output about internal Logical Volumes that are components of normally-accessible Logical Volumes, such as mirrors, but which are not independently accessible (e.g. not mountable). For example, after creating a mirror using 'lvcreate -m1 --mirrorlog disk', this option will reveal three internal Logical Volumes, with suffixes mimage_0, mimage_1, and mlog. -c, --colon Generate colon separated output for easier parsing in scripts or programs. N.B. lvs (8) provides considerably more control over the output. The values are: * logical volume name * volume group name * logical volume access * logical volume status * internal logical volume number * open count of logical volume * logical volume size in sectors * current logical extents associated to logical volume * allocated logical extents of logical volume * allocation policy of logical volume * read ahead sectors of logical volume * major device number of logical volume * minor device number of logical volume -m, --maps Display the mapping of logical extents to physical volumes and physical extents. To map physical extents to logical extents use pvs --segments -o+lv_name,seg_start_pe,segtype. --columns | -C Display output in columns, the equivalent of lvs. Options listed are the same as options given in lvs (8). Examples "lvdisplay -v /dev/vg00/lvol2" shows attributes of that logical volume. If snapshot logical volumes have been created for this original logical volume, this command shows a list of all snapshot logical volumes and their status (active or inactive) as well. "lvdisplay /dev/vg00/snapshot" shows the attributes of this snapshot logical volume and also which original logical volume it is associated with. SEE ALSO
lvm(8), lvcreate(8), lvscan(8), pvs(8) Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) LVDISPLAY(8)