shell script to create multiple LVM's or raw devices for syabse

ganaiwali · 03-22-2011, 08:24 AM

hey experts ,

I have Disk /dev/cciss/c0d1: 599.9 GB, unallocated on CentOS release 5.4 .

I need to create about 30-40 LVM's worth 500GB as raw devices for sybase . is there a way to script it or anyone already has it ?

the problem is that each time we need to do fdisk /dev/cciss/c0d1 and enter the partition no to create a new one .. how to overcome that problem and automate it in a script ?

thx,
tariq

acid_kewpie · 03-22-2011, 08:28 AM

well i think fdisk can be used as a command line, parted certainly can. Why do you need so many file systems though?

ganaiwali · 03-22-2011, 09:16 AM

I understand fdisk and parted can but all manually .. I am looking for a work around on if anyone has an existing shell script or so to do the job .

you need so many file systems i-e raw devices (un-partitioned ) for the best possible performance of db application . Linux general has its own very high OS I/O overhead and to over come that you create raw devices for ghe db app .

more http://infocenter.sybase.com/help/in...x/BEIFFBJD.htm

ganaiwali · 03-23-2011, 03:13 AM

I figured not not create a different volume each time just cus i need so many LVM's however a simple for loop did the trick

for i in 'seq 1 10'; do lvcreate -L 10G -n lvname$i vgname; done

will create LVM's lvname1 - lvname10 on vg vgname