Comments on: Expanding RAID & Partitions on Mac

By: Junjun Mao

Junjun Mao — Wed, 16 Jun 2010 20:22:25 +0000

I migrated RAID10 to RAID6 on a Promise Storage Array and read manual page of diskutil to confirm the HFS+ Volume could be resized to include “free space” before starting the job. Yet I got stuck at claiming the newly created disk space. Thanks to this post. It really works!

By: Tri Tran

Tri Tran — Sun, 13 Jun 2010 23:01:53 +0000

I too must thank you for this invaluable advise. Neither Apple or the raid card manufacturer could help me without erasing my existing 2 TB RAID5. That was a non-starter. Thanks again.

By: Juan Sibila

Juan Sibila — Fri, 05 Mar 2010 19:21:07 +0000

This solution rocks! I was able to extend our iSCSI volume, finally. I’ve printed it to PDF and added it to our internal Kbase at my work. Thank you.

By: joao

joao — Wed, 27 Jan 2010 05:31:27 +0000

I just did it on a AXUS RAID 6 on Mac OS X Server 10.5.8 and this works!
Thanks Thanks Thanks for this !
regards

By: Rasmus Lauridsen

Rasmus Lauridsen — Mon, 11 Jan 2010 07:09:46 +0000

Hi Scott

Just wanted to thank you for this little nugget. Had an iSCSI disk on a linux logical volume that resized ok but I got the horrible “MediaKit reports partition (map) too small.” error. This was a nice easy fix and really should be ranked over the multitude of redo partition solutions on google.

So thanks ALOT

By: Ivy Jane Gardiner

Ivy Jane Gardiner — Tue, 03 Nov 2009 00:28:20 +0000

Thank you so much.

We were bashing our head after adding tonnes of disc to our iSCSI array and this brilliant.

Thanks again. Worked a Treat.

de VK3IVY aka Ivy =)

By: Tony

Tony — Fri, 16 Oct 2009 15:08:41 +0000

This worked without a problem. Thanks so much for the info.

By: Jon Hunwick

Jon Hunwick — Mon, 21 Sep 2009 02:37:52 +0000

Scott, Thanks so much for this!

I took a bit of a calculated risk building a DIY RAID, and thanks to your post I have no worries about any aspect of the array now.

I am running a RocketRaid 3540, I expanded to 7.5TB but was unable to find anywhere or anyone who had successfully expanded using this card under MAC OS X. even Highpoint said it was unsupported under OS X… so after the 4 days it took to expand the drive i am very grateful to find your post!

Thanks again!

Jon

By: Felipe

Felipe — Sat, 12 Sep 2009 18:53:52 +0000

Thanks for this! I was having problema resizing
partitions after removing a Linux install.
I don’t have RAID but this worked just fine.

By: James

James — Thu, 13 Aug 2009 14:14:41 +0000

Diskutil is still modifying the partition map as I write this… but I just have to say “thanks.” This is terribly useful and should be posted all over the net as a useful and easy way to migrate up a raid 5 system.

@todd - a day late and a dollar short, but I got the same response from show gpt Todd when I added the disk slice. /dev/disk7s4. The ’s4″ part made it go wonky and return the whole volume info with no gpt info. Then I re read the instructions and did a rectal cranial inversion and got it working. Well, theoretically… diskutil is still thinking as I write this. IT did, however save me from having to move 3 TB around my system.

Thanks Scott. Well done.

-James