Re: Is this likely to cause me problems?
From: John Robinson <hidden>
Date: 2010-09-21 22:34:26
On 21/09/2010 22:18, Jon Hardcastle wrote:
quoted hunk ↗ jump to hunk
--- On Tue, 21/9/10, John Robinson<john.robinson@anonymous.org.uk> wrote:quoted
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 drivewith a new one.quoted
I normally create a partition the size of the entiredisk 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 RAID6arrayquoted
sdc--- /dev/sdc12048 1953525167 976761560 fd Linux raid autodetectquoted
--- Seems to be different to sda say which is also '1TB' sda--- /dev/sda163 1953520064 976760001 fd Linux raid autodetectquoted
--- Now i read somewhere that the sizes flucuate but assome 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 forsure... 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.