Re: argh!

[John Robinson <john.robinson@anonymous.org.uk>]

On 31/10/2010 21:44, Neil Brown wrote:
> On Sun, 31 Oct 2010 21:18:52 +0000
> Jon Hardcastle<jonathan.hardcastle@gmail.com>  wrote:
>
>> Hi,
>>
>> Thanks for your help. I use 0.90 as that is what there was when the
>> machine was build ~3yrs ago.. the array has been grown and resized
>> since then.
>>
>> Does anyone have a feature list for the superblocks? Why upgrade.....?
>
> The "md" man page mentions a couple of differences:
>    - v1.x can handle more than 28 devices in an array
>    - v1.x can easily be moved between hosts with different endian-ness
>    - v1.x can put the metadata at the front of the array
>
> I should probably add the other differences.
>
>    - with 0.90 there can be confusion about whether a superblock applies
>      to the whole device or to just the last partition (if it start on a
>      64K boundary).  1.x doesn't have that problem
>    - With 1.x a device recovery can be checkpointed and restarted.
>    - with 0.90, the maximum component for RAID1 or higher is 2TB (or maybe
>      4TB, not sure).  With 1.x you can go much higher.

Aha. Some other good info for me to perhaps incorporate if I ever get 
round to trying to patch the man page. In fact I probably ought to 
review the last few months' list postings, and especially Neil B's.

Cheers,

John.