With 0.90 superblocks, I have never seen any array (raid1,raid5,raid6) try 
to correct a read-error, but when I made an array with 1.2 superblocks 
(not the boot volume of course) using VelociRaptors, great for testing 
crap disks that don't work in read, I did see it try to correct read 
errors!  I was wondering if that is only applicable to superblocks >= 
1.x+?

Is this actually true that RAID 1 volumes with 0.90 Superblock will not do read recovery?



-----Original Message-----
From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Kasper Sandberg
Sent: 27 November 2009 22:22
To: Justin Piszcz
Cc: linux-raid
Subject: Re: Question for Neil/Superblocks

On Fri, 2009-11-27 at 16:27 -0500, Justin Piszcz wrote:

Hi Neil,

A couple of things, recently I tried to make a new system (MDADM/latest/SW 
RAID1) and noticed that GRUB & LILO still only support 0.90 superblocks. 
This leads me to my next question.

Will the newer superblocks be supported? I ask this due to my final 
question.

With 0.90 superblocks, I have never seen any array (raid1,raid5,raid6) try 
to correct a read-error, but when I made an array with 1.2 superblocks 
(not the boot volume of course) using VelociRaptors, great for testing 
crap disks that don't work in read, I did see it try to correct read 
errors!  I was wondering if that is only applicable to superblocks >= 
1.x+?

I know you can build yourself an initrd/miniroot so/on/so forth but its 
nice when you can just build a kernel, run lilo and have it auto-detect 
the raid1 volumes and boot accordingly (as you can with 0.90 superblocks).

have a separate boot partition raid1....

Justin.
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