[Bug 1374166] Re: Document how to add swap space on Azure resource disk

trialotto admiraalmichiel at gmail.com
Fri Jan 16 18:48:36 UTC 2015


@Daniel,

I did all the testing before and came to the same result (as you are
probably aware of) BUT with a different CONCLUSION.

I personally concluded that the use of swap partitions, if ever
desirable, is (also) not desirable in the current case AND certainly not
on an ephemeral disk, given that:

1 - a swap partition at the beginning of a device/disk can be efficient, but will lead to a waste of disk space, with this being static, 
2 - a huge swap partition (if someone makes that strange mistake) will result in severe problems and performance issues, 
3 - a swap partition at creation time considerably reduces "provisioning speed/performance", 
4 - a swap partition can become huge (i.e. too large) if a VM is upgraded to a larger size (with a larger ephemeral disk), 
5 - an OPTIMAL swap partition should be a function of memory (similar to logic introduced with cloud-config setting swap). 

Moreover, the swap partition as such can become obsolete, given the swap
function(s) in cloud-init versions 0.7.6 and 0.7.7.

In short, I have an issue with the procentual division of the disk, into
a normal partition and a swap partition.

The percentage assigned to the swap partition should be able to allow
for

- automated calculations of the percentage (via logic, to optimize swap space)
- manual overrides of the automated calculations

Kind regards....

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https://bugs.launchpad.net/bugs/1374166

Title:
  Document how to add swap space on Azure resource disk

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