[olug] April Meeting ideas?

[Jay Swackhamer]

I am running Raid0(striped) on Promise ATA-Raid controllers, and have
experience with LVM under Linux/HPUX, and while I cannot give a presentation
, I can provide some information to whomever might need additional
examples....

I have the following setup on my machine at home

2 - 100gig Western Digital ATA-100 7200 RPM drives
Raid0 (striped) with ata-raid on the Promise controller for 200gig total,

Partitioned:

Disk /dev/ataraid/d0: 255 heads, 63 sectors, 24322 cylinders
Units = cylinders of 16065 * 512 bytes

           Device Boot    Start       End    Blocks   Id  System
/dev/ataraid/d0p1   *         1      2550  20482843+   c  Win95 FAT32 (LBA)
/dev/ataraid/d0p2   *      2551      2557     56227+  83  Linux
/dev/ataraid/d0p3          2558      3705   9221310   83  Linux
/dev/ataraid/d0p4          3706     24322 165606052+   5  Extended
/dev/ataraid/d0p5          3706     17729 112647748+  8e  Linux LVM
/dev/ataraid/d0p6         17730     24322  52958241   8e  Linux LVM

(the two LVM disks are because I had 50 gig for windows temporarily)

I setup the ~160gig LVM section so that I can increase partitions as
the usage grows, instead of trying to guess upfront.

[root at athlon root]# vg_bdf
VG Name         Megabytes       Used_Mbytes     Avail_Mbytes
_______         ____________    ___________     ____________
vg01            161712          157504          4208
Total Disk: 161712      Used: 157504     Free: 4208

[root at athlon backup]# df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/ataraid/d0p3      9076396   8200836    414496  96% /
/dev/ataraid/d0p2        54447     44082      7554  86% /boot
none                    516488         0    516488   0% /dev/shm
/dev/vg01/opt          2015824   1185176    728248  62% /opt
/dev/vg01/video       60479228  46018080  11389148  81% /opt/video
/dev/vg01/games        6553520   5936128    284592  96% /opt/games
/dev/vg01/backup      10078136   3173648   6494888  33% /opt/backup
/dev/vg01/temp        22174236  12609384   8438452  60% /opt/temp
/dev/vg01/movies      40316280  32911376   5356904  87% /opt/movies
/dev/vg01/wine         5043712   3382360   1405148  71% /opt/wine_c
/dev/vg01/source       5545592   3419028   1844964  65% /opt/source
/dev/vg01/music        4031680   2366136   1460744  62% /opt/music
/dev/vg01/images       1511856   1232588    202468  86% /opt/images
/dev/ataraid/d0p1     20472816  12967280   7505536  64% /opt/windows_c

The LVM commands under linux are similar to the HP lvm commands.
lvm                  (8)  - Linux Logical Volume Manager
lvmchange            (8)  - change attributes of the logical volume manager
lvmcreate_initrd     (8)  - create an initial ramdisk to boot with root on
a logical volume
lvmdiskscan          (8)  - scan for all disks / multiple devices /
partitions available
lvmsadc              (8)  - LVM system activity data collector
lvmsar               (8)  - LVM system activity reporter
pvcreate             (8)  - initialize a disk or partition for use by LVM
vgscan               (8)  - scan all disks for volume groups and build
/etc/lvmtab and /etc/lvmtab.d/* which are the database for all other lvm
commands

vgcfgbackup          (8)  - backup volume group descriptor area
vgcfgrestore         (8)  - restore volume group descriptor area
vgchange             (8)  - change attributes of a volume group
vgck                 (8)  - check volume group descriptor area
vgcreate             (8)  - create a volume group
vgdisplay            (8)  - display attributes of volume groups
vgexport             (8)  - make volume groups unknown to the system
vgextend             (8)  - add physical volumes to a volume group
vgimport             (8)  - make volume groups known to the system
vgmerge              (8)  - merge two volume groups
vgmknodes            (8)  - create volume group directory and special files
vgreduce             (8)  - reduce a volume group
vgremove             (8)  - remove a volume group
vgrename             (8)  - rename a volume group
vgscan               (8)  - scan all disks for volume groups and build
/etc/lvmtab and /etc/lvmtab.d/* which are the database for all other lvm
commands
vgsplit              (8)  - split a volume groups


So basically you get a group of disks in a machine
run 'pvcreate' on each disk/partition to create the physical volumes

then
vgcreate - to create a 'Volume group' including the disks that you want/need
to group together

Then once the volume group is created you can user 'lvcreate' to create
the 'logical volumes' which are partitions that you can specify which disk
or disks they are on, the size, and can later resize and extend the
filesystem without moving data.


-- 
Jay Swackhamer

Reboot The User
15791 West Dodge Road, STE 135
Omaha, NE 68118
(402) 933-6449
http://www.RebootTheUser.com