Re: Raid-10 mount at startup always has problem

[Luca Berra <bluca@comedia.it>]

On Fri, Oct 26, 2007 at 06:53:40PM +0200, Gabor Gombas wrote:
>On Fri, Oct 26, 2007 at 11:15:13AM +0200, Luca Berra wrote:
>
>> on a pc maybe, but that is 20 years old design.
>> partition table design is limited because it is still based on C/H/S,
>> which do not exist anymore.
>
>The MS-DOS format is not the only possible partition table layout. Other
>formats such as GPT do not have such limitations.
>
>> Put a partition table on a big storage, say a DMX, and enjoy a 20%
>> performance decrease.
>
>I assume your "big storage" uses some kind of RAID. Are your partitions
>stripe-aligned? (Btw. that has nothing to do with partitions, LVM can
>also suffer if PEs are not aligned).
mine are, unfortunately the default is to start them at 32256 bytes into
the device.

>>> Oh, and let's not go into what can happen if you're talking about a dual
>>> boot machine and what Windows might do to the disk if it doesn't think
>>> the disk space is already spoken for by a linux partition.
>> Why the hell should the existance of windows limit the possibility of
>> linux working properly.
what i am saying is that a dual boot machine is not the only scenario we
have.

>> On the opposite, i once inserted an mmc memory card, which had been
>> initialized on my mobile phone, into the mmc slot of my laptop, and was
>> faced with a load of error about mmcblk0 having an invalid partition
>> table. Obviously it had none, it was a plain fat filesystem.
>> Is the solution partitioning it? I don't think the phone would
>> agree.
>
>Well, it said it could not find a valid partition change. That was the
>truth. Why is it a problem if the kernel states a fact?
it is random. reformatting it made the kernel message go away.
i wonder if by chance something would decide it is a valid partition
table....

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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