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yzg
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Joined: 18 Jun 2005
Posts: 192

PostPosted: Wed Jun 26, 2013 2:01 am    Post subject: Gentoo partition layout Reply with quote

Is there a technical reason for having the standard Gentoo partition layout as

Code:

/dev/sda1  boot
/dev/sda2  swap
/dev/sda3  root


instead of

Code:

/dev/sda1  boot
/dev/sda2  root
/dev/sda3  swap


or it was just an ad hoc decision?
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John R. Graham
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PostPosted: Wed Jun 26, 2013 3:25 am    Post subject: Reply with quote

While your root partition is less than almost completely full, swap space at the beginning of the physical disk will be closer to most of your files, thus minimizing seek times, so not arbitrary. :wink:

- John
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yzg
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PostPosted: Wed Jun 26, 2013 11:33 pm    Post subject: Reply with quote

Hi John

Thank you for pointing this reason.

But if the root partition is greater than 50% full, then the [boot,root,swap] order will be better.

I'm thinking of a fast recovery scheme where the root partition is small and I will do an image for the disk to the end of the root partition. Having the swap partition at the end will make the image smaller and faster.
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Hu
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PostPosted: Thu Jun 27, 2013 1:02 am    Post subject: Reply with quote

If your backup is based on the contents of the filesystem, its size will not be affected by where you place the partitions on the underlying drive. If your backup is based on a dump of the drive, then you are copying free space.
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John R. Graham
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PostPosted: Thu Jun 27, 2013 2:40 am    Post subject: Reply with quote

yzg wrote:
But if the root partition is greater than 50% full, then the [boot,root,swap] order will be better.
Well, no. Only the files after the 50% mark will be closer to a trailing swap partition. Like I said, until the drive is completely full, most files will be closer to a leading swap partition.

- John
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