On 21/09/2010 22:18, Jon Hardcastle wrote:
--- 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.
--
I used fdisk in all cases.. on the same machine.. so unless fdisk has changed?
May have done. Certainly my util-linux from CentOS 5 is newer than the
last version of util-linux on freshmeat.net and kernel.org. Peeking at
the source code, it looks like Red Hat have been patching util-linux
themselves for almost 5 years.
primary... 1 partition.. default start and end.
and what do you mean about not using the last chunk of old disc?
Your sda has 1953525168 sectors but your partition ends at sector
1953520064, 5104 sectors short of the end of the disc. This may be
related to the possible bug somebody complains about on freshmeat.net
whereby fdisk gets the last cylinder wrong. I just checked, on my 1TB
discs I have the same end sector as you so I guess the fdisk I had when
I built my array was the same as yours when you built yours.
Cheers,
John.
--
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