--- On Tue, 21/9/10, John Robinson <john.robinson@xxxxxxxxxxxxxxxx> wrote:
> From: John Robinson <john.robinson@xxxxxxxxxxxxxxxx>
> Subject: Re: Is this likely to cause me problems?
> To: Jon@xxxxxxxxxxxxxxx
> Cc: linux-raid@xxxxxxxxxxxxxxx
> Date: Tuesday, 21 September, 2010, 22:15
> On 21/09/2010 21:33, Jon Hardcastle
> wrote:
> > I am finally replacing an old and now failed drive
> with a new one.
> >
> > 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...
> >
> > Below is an fdisk dump of all the drives in my RAID6
> array
> >
> > sdc---
> > /dev/sdc1
> 2048
> 1953525167 976761560 fd
> Linux raid autodetect
> > ---
> > Seems to be different to sda say which is also '1TB'
> >
> > sda---
> > /dev/sda1
> 63
> 1953520064 976760001 fd
> Linux raid autodetect
> > ---
> >
> > Now i read somewhere that the sizes flucuate but as
> some core value remains the same can anyone confirm if this
> is the case?
> >
> > 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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