Comments on: Growing a RAID5 array – MDADM

By: Mike

Mike — Mon, 15 Mar 2010 00:45:41 +0000

Linux Raid Wiki has moved to http://raid.wiki.kernel.org/

By: rm_you

rm_you — Thu, 18 Feb 2010 17:12:23 +0000

Just expanded my array from 5×1Tb to 6×1Tb, and it took around 30 hours to finish growing the array. Then the fsck took quite a bit of time (I decided to sleep sometime after 20 minutes or so of watching stage 1… BTW at least on ubuntu, it has to be “fsck -f /dev/md0″, or else it will just say “clean!” and refuse to resize). Finally, the grow took about 3 seconds.

This went more smoothly than I could possibly have imagined… At every stage I was anticipating disaster, but I was pleasantly surprised. Not one error all the way through! Thanks for the simple walkthrough!

By: Fermulator

Fermulator — Tue, 05 Jan 2010 23:47:40 +0000

FYI: Updated Linux RAID Wiki Link: http://www.linuxfoundation.org/collaborate/workgroups/linux-raid

By: JamieRF » Software RAID-5: using mdadm in Ubuntu 9.10

JamieRF » Software RAID-5: using mdadm in Ubuntu 9.10 — Wed, 04 Nov 2009 19:54:41 +0000

[...] Growing a RAID5 array – MDADM [...]

By: Janiek

Janiek — Sun, 18 Oct 2009 12:16:55 +0000

Don’t forget to modify mdadm.conf, or the array won’t be detected on the next boot.

By: mehoo

mehoo — Thu, 20 Aug 2009 04:59:20 +0000

Jonas I am going from 5tb drives to 6 and am very hesitant, it will be maxing out my space on this mb and hopefully will help with my editing space.

At Jon H that doesn’t look like a raid 5 set up. I was told u are limited by the smallest partition in raid 5 and u don’t want to mix different ones.
Hence why my coming server rack is going to probally go 2tb drive right off so as they come down and i expand I can fill out to the 10 tb mirrored raid I need. Only problem is where to buy WD black 2tb drives they seem to only be coming in green where i shop.

By: Jon H

Jon H — Sun, 16 Aug 2009 09:23:31 +0000

Hey, anyone got any pointers on how big to make the raid partitions? I have a 6 drive array made up of 4×500 and 2×750 in preparation for all drives being grown when i have phased out all the 500GB’s – which is what i am about to do.. switch out a 500GB with a 1TB. But i wonder how large should the raid partition be? I read that all drives vary slightly in block sizes? so i should smooth that over?

By: Jonas

Jonas — Thu, 14 May 2009 05:49:05 +0000

Growing a raid5(6tb->7.5tb):
md_d0 : active raid5 sdg1[5] sdb1[0] sdf1[4] sde1[3] sdd1[2] sdc1[1]
5860543488 blocks super 0.91 level 5, 256k chunk, algorithm 2 [6/6] [UUUUUU]
[====>................] reshape = 22.0% (322644992/1465135872) finish=1875.4min speed=10152K/sec

By: External USB RAID 5 array using mdadm - jacoblarson.com «

External USB RAID 5 array using mdadm - jacoblarson.com « — Wed, 29 Apr 2009 02:51:02 +0000

[...] Update: I just added another two 1TB drives, for a total of five! This article about growing RAID 5 arrays was very helpful. [...]

By: chad

chad — Fri, 03 Apr 2009 19:10:09 +0000

hey I had a question about the growth speed. I added a 1.5TB drive to a raid6, only I didn’t change the /proc/sys/dev/raid/speed_limit_minor speed_limit_max before I issued the grow, does it change speeds dynamically? I have about 28 hours left if not (12 hours into it)…