On 05/08/2010 05:02 PM, C David Rigby wrote:
On Saturday 08,May,2010 04:53 PM, Goh Lip wrote:
Hello Goh Lip,
I was planning on doing this at some stage (I just installed Lubuntu to
my laptop in a separate partition and I am reading up on update-grub
right now).
I've read that one should NOT allocated a swap space on a USB flash
device due to the limited number of re-writes that flash media can
support before it degrades. Do you concur with this? Would an "Install
to USB" how-to be a useful addition to our wiki?
David, that was fast!
I am not a good source for swap and 'swappiness' but from what I know,
and others please correct me if I am wrong, the following points hold
o when installing an OS to usb drive, the desktop hard drive swap is
enabled at the fstab of the usb OS as well. (I verified this). In
other words, when using the usb OS at the desktop where it was
installed, the swap is automatically enabled due to the presence of
the fstab entry, (unless of course the uuid is changed)
o For many cases for new computers, the swap is usually zero or close
to zero, ie, no need for swap unless extremely high stress
applications is run (or more usually, before adobe flash crashes your
firefox :) ). The 'newer' uses for swap is for hibernation and sleep
and this requires a slightly more memory than your ram memory.
o Yes, rewrites will degrade flash and hard drive memory but I think
it will require 'petazillions' to do that now that most home users
will have no need to worry about that.
Having said that, what should you do? Actually, I don't know. ;)
But I'll you what I did. With hard drive memory so much now, I
allocate a more than enough to my hard drive swap. 2.5 x ram.
But my flash? Zilch! And I don't lose any sleep over it.
Hope that helps, David.
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