Archive for the ‘hp eva’ Category

Linux multipathing

I use MPxIO in Solaris quite often and it works very well for me. This time I needed to test out I/O multipathing in RedHat. What I really needed to do: have a server with two HBA’s manage a mirror which has submirrors on separate SAN’s; so that the server has multiple paths to each [...]

Posted on November 27, 2009 at 22:40 by somedude · Permalink · Leave a comment
In: centos, fibre channel, hp eva, linux, linux tips, multipathing, redhat, san, storage

Weird disk label after using ZFS on a LUN

If you ever used ZFS on a LUN and then tried to reuse that LUN for UFS you might have noticed a “weird” disk label on it. This is known as EFI label. Here is how it looks in format command: partition> p Current partition table (original): Total disk sectors available: 73383902 + 16384 (reserved [...]

Posted on October 4, 2009 at 16:42 by somedude · Permalink · Leave a comment
In: hp eva, solaris, solaris tips, zfs

Growing mirrored LUN in RedHat

I was putting a RedHat server onto a SAN and I could not find any clear instructions on how to grow a single mirrored LUN on the fly. Anyway, here are some notes on the process. First the setup: Two LUN’s mirrored across two SAN’s with LVM volume on the top of it. I could [...]

Posted on February 6, 2009 at 23:52 by somedude · Permalink · 2 Comments
In: centos, hp eva, linux, linux tips, linux utilities, lvm2, multipathing, redhat, san, storage

Growing Solaris Volume Manager mirrors online

You have a SVM mirror and you need to grow it. Online. All steps are straight forward except for the last one. So, in a nutshell: Grow sizes of both submirror LUN’s on SAN Detach the first submirror metadevice Clear the submirror metadevice Make the system see new LUN size Recreate the submirror metadevice, attach [...]

Posted on November 8, 2008 at 15:41 by somedude · Permalink · Leave a comment
In: hp eva, san, solaris, solaris tips, solaris volume manager, storage

Moving LUN’s between hosts using metarecover

Sometimes you might need to move a LUN between hosts X and Y on a SAN. Solaris has cool command, metarecover, that lets you do just that. First, you will need to stop all processes on X that might be using the given LUN. Then unmount the LUN and present it to the host Y. [...]

Posted on April 2, 2008 at 07:11 by somedude · Permalink · Leave a comment
In: hp eva, san, solaris tips, solaris utilities, solaris volume manager, storage