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[Qemu-devel] HD Image Size Limits and hdachs
From: |
Jason Brittain |
Subject: |
[Qemu-devel] HD Image Size Limits and hdachs |
Date: |
Thu, 30 Dec 2004 11:21:37 -0800 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20041020 |
This has been asked on this list before, but wasn't answered (I've
scoured the list and docs for the answer and it's not in either one):
What are Qemu's limits for hard drive image files?
For example, if I'm using qcow, how large of an image can I safely use,
say, with Linux host & Linux guest? It seems like qemu-img lets me
create pretty large images, but in a previous message Fabrice notes that
the maximum parameters for the hdachs switch are: 16383,16,63[,none|lba|auto].
If I understand the math correctly, that yields a maximum of 7 gigabytes:
16383 cyls * 16 heads * 63 sectors * 512 bytes = 8455200768 total bytes,
which comes out to 7Gb.
BUT, I have been creating qcow images 16Gb in size, and they've been
working fine (while NOT using the -hdachs startup switch). So wouldn't
that mean that qemu is able to guess geometry larger than it accepts on
the command line with -hdachs? If so, isn't this sort of a bug?
What am I missing here?
Thanks..
--
Jason "-headaches" Brittain
- [Qemu-devel] HD Image Size Limits and hdachs,
Jason Brittain <=