From: James McMechan <James_McMechan@ho...> - 2003-01-31 09:52:20
Up to 8 (0..7) ubd devices are can be used on stock user mode linux.
The MAX_DEV parameter in ubd_kern.c can be raised to 16 but only 10 digits
(0..9) will fully work until one of the patches updateing to simple_strtoul
from a single digit is applied.
The letters from 'a'..'h' can be used instead of numbers, on a stock UML you
can add up to 'z' but can not remove by letter and 'r','s' might have side
effects by setting read-only or sync
Back in October I made a couple of patches, I used  to setup 400 * 2GiB
COWed disks (where I was running low on memory) and 128 * 512GiB disks to
achive a 64TiB array without COW, and  to speed up COW file creation by
approx 32,000,000 times, it was limiting doing one write system call for
every 32 sectors in the backing file the ubd-user patch does only one write
system call for any size backing file.
Get latest updates about Open Source Projects, Conferences and News.