topic Re: why root, boot swap dump are contiguous? in Operating System - HP-UX

why root, boot swap dump are contiguous?

samay_hcl — Sat, 17 Jul 2010 09:39:05 GMT

hello experts could you please explain me why
why root, boot swap filesystems are contiguous?
Thanks!

Re: why root, boot swap dump are contiguous?

Matti_Kurkela — Sat, 17 Jul 2010 10:34:11 GMT

The HP-UX bootloader is too simple to understand LVM or VxVM, because it needs to be very small (especially in PA-RISC systems).

The requirement that /stand, swap and the root filesystem are all contiguous and always in the same order will allow the bootloader to use a very simple algorithm to find all the things it needs (the kernel file from /stand, the primary swap, and the root filesystem).

Once the bootloader has successfully started the kernel and told it where the root filesystem is, the kernel will handle the rest with its built-in LVM (or VxVM) support.

MK

Re: why root, boot swap dump are contiguous?

Vijaykumar_1 — Sat, 17 Jul 2010 12:19:01 GMT

The extents are in sequence and can be accessed better when compared to a linked allocation.

The PE's are next to each other in contiguos allocation, whereas in linked the PE's are diversed

Re: why root, boot swap dump are contiguous?

Dennis Handly — Sat, 17 Jul 2010 21:49:12 GMT

>Vijaykumar: The extents are in sequence and can be accessed better

It isn't better/worse, it's as MK said, smart vs simple.

Re: why root, boot swap dump are contiguous?

KapilRaj — Mon, 19 Jul 2010 15:00:25 GMT

Simple - that's it. Although it is time to move ahead.

HPUX should come up with a native VxVM/LVM aware boot loader so that it is easy to re-size partitions in future.

Re: why root, boot swap dump are contiguous?

samay_hcl — Wed, 21 Jul 2010 05:21:05 GMT

Thanks for all your help.