Increase size of LUN in SAN on Linux servers without rebooting the server

[Grzegorz Jajuga]

First of all, I'm quite new to Linux so forgive me if I use the terms 'disks', 'partitions' and 'devices' incorrectly below!

I have a Red Hat 5.2 x86_64 server with kernel version 2.6.18-92.el5. I have several SAN-based Vdisks presented to the server, appearing as /dev/sd*x* and, when I create a partition, /dev/sd*x*1 . The SAN is an hp EVA-8100.

Occasionally I need to extend a disk. I can increase the size of the Vdisk via the hp Command View EVA software, but the only way currently I can get the server to recognise the additional space is to reboot the server.

For various reasons I'm not currently using an LVM. Is there a command or method I can use to get the server to recognise the additional space without rebooting the server?

[Matti_Kurkela]

Please see RedHat's Online Storage Reconfiguration Guide:

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/index.html

In particular, chapter 14 (Resizing an Online Logical Unit) seems to be what you want.

MK

[sktskt]

Good document. Thanks