[Lincoln LUG] disk size

[Andrew Walmsley]

Really nice of u Terry. Appreciated

On 5 Oct 2017 5:59 p.m., "Terry Froy via Lincoln" <
lincoln at mailman.lug.org.uk> wrote:

> Hi Andrew,
>
> As long as the partition you need to grow is the one at the end of the
> disk, you can do this without using 3rd party tools.
>
> The first thing you do is to take a backup of the partition table:
>
> sfdisk -d /dev/vda > /root/sfdisk-part-backup.txt
> (the -d is for dump)
>
> Copy sfdisk-part-backup.txt over to removable media Just In Case(tm).
>
> Once you have done this, run regular fdisk as superuser and:
>
> * Print the partition table (making note of start sector and partition
> type).
> * Delete the partition - this removes the partition info from the
> partition table - but until you enter 'w' to write the partition table,
> nothing on disk will be touched.
> * Create a new partition - ensure the start sector matches what you noted
> down when you printed the partition table, the end sector should be higher
> than the one you noted down - otherwise, you won't be growing the partition.
> * Set the partition type to match that of what you noted down.
> * Print the partition table again (verifying that start sector and
> partition type match that of the old partition).
> * If the start sector and partition type do not match, 'q' and then ENTER
> to exit without committing changes to disk.
> * Write the partition table to disk ('w' and then ENTER).
> * Quit fdisk ('q' and then ENTER).
> * Reboot the machine.
> * When the machine comes back up, use resize2fs or whatever utility is
> necessary to grow the filesystem in that partition.
>
> It is perfectly safe to do this while the underlying filesystem is mounted
> as fdisk does not touch the contents of the partition, merely the
> information which is held about the partition.
>
> If you get it wrong and the machine does not boot (you hit problems, etc),
> boot with a Live CD, insert the removable media which has the partition
> table backup on and then do:
>
> cat sfdisk-part-backup.txt | sfdisk /dev/vda
>
> This will restore the backup of the partition table and you should then be
> able to boot your system without removable media.
>
> Regards,
> Terry Froy
> Spilsby Internet Solutions
> http://www.spilsby.net/
>
> ----- Original Message -----
> From: "Andrew Walmsley via Lincoln" <lincoln at mailman.lug.org.uk>
> To: "Lincoln LUG mailing list" <lincoln at mailman.lug.org.uk>, "
> corenominal at corenominal.org" <philip.newborough at gmail.com>
> Sent: Tuesday, 3 October, 2017 11:37:23 PM
> Subject: [Lincoln LUG] disk size
>
>
>
> hi everyone
>
>
> Is there a way of resizing a disk that is in use? Running a debian server
> (no gui) with 1 drive that was set to 5gb, which is now running out of
> space. yes i know its a stupid size (not my fault). Increased the vm to see
> 10gb.
>
>
> diskpart is no good as i'm booting to the drive which is mounting.
>
>
> What is best way round? mount a live cd? add an extra drive?
>
>
> Help!
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> andy
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