--- On Tue, 21/9/10, John Robinson <john.robinson@anonymous.org.uk> wrote:

From: John Robinson <redacted>
Subject: Re: Is this likely to cause me problems?
To: Jon@eHardcastle.com
Cc: linux-raid@vger.kernel.org
Date: Tuesday, 21 September, 2010, 22:15
On 21/09/2010 21:33, Jon Hardcastle
wrote:

quoted

I am finally replacing an old and now failed drive

with a new one.

quoted

I normally create a partition the size of the entire

disk and add that but whilst checking the sizes marry up i
noticed that is an odity...

quoted

Below is an fdisk dump of all the drives in my RAID6

array

quoted

sdc---
/dev/sdc1           

2048 
1953525167   976761560   fd 
Linux raid autodetect

quoted

---
Seems to be different to sda say which is also '1TB'

sda---
/dev/sda1           

  63 
1953520064   976760001   fd 
Linux raid autodetect

quoted

---

Now i read somewhere that the sizes flucuate but as

some core value remains the same can anyone confirm if this
is the case?

quoted

I am reluctant to add to my array until i know for

sure...

Looks like you've used a different partition tool on the
new disc than you used on the old ones - old ones started
the first partition at the beginning of cylinder 1, new ones
like to start partitions at 1MB so they're aligned on 4K
sector boundaries and SSDs' erase group boundaries etc. You
could duplicate the original partition table like this:

sfdisk -d /dev/older-disc | sfdisk /dev/new-disc

But it wouldn't cause you any problems, because the new
partition is bigger than the old one, despite starting a
couple of thousand sectors later. This in itself is odd -
how did you come to not use the last chunk of your original
discs?

Cheers,

John.

Ok, Thank you.

So do you have any recommendations? I would like to 'trust' the new version of fdisk but I can not risk torpedoing myself. I have 2 more drives I need to 'phase out' at some point; but they will liklely be with 1.5TB drives.

My gut tells me that i should whilst I have other drives the same size use the same paratermeters... then when i have a bigger drive that is definately not going to cause any size issues let fdisk do its magic.

So following that premsis is there any down side to copy the partition table off another drive?


      
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