03-30-2009
If a raid 10 made up of 12 disks is 6 disks in a striped volume mirrored against another volume of 6 disks in a striped volume, the the mirroring process (which has to write to both striped volumes) slows down writes compared with reading (which only has to read from one of the striped volumes), normally.
I think writing to /dev/zero is not a good idea, I would try writing to /dev/null instead.
Reading from /dev/random would be interesting to compare with reading from /dev/zero also?
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LEARN ABOUT CENTOS
extlinux
extlinux(1) General Commands Manual extlinux(1)
NAME
extlinux - install the SYSLINUX bootloader on a ext2/ext3 filesystem
SYNOPSIS
extlinux [options] directory
DESCRIPTION
EXTLINUX is a new syslinux derivative, which boots from a Linux ext2/ext3 filesystem. It works the same way as SYSLINUX, with a few slight
modifications. It is intended to simplify first-time installation of Linux, and for creation of rescue and other special-purpose boot
disks.
The installer is designed to be run on a mounted directory. For example, if you have an ext2 or ext3 usb key mounted on /mnt, you can run
the following command:
extlinux --install /mnt
OPTIONS
-H, --heads=#
Force the number of heads.
-i, --install
Install over the current bootsector.
-O, --clear-once
Clear the boot-once command.
-o, --once=command
Execute a command once upon boot.
-M, --menu-save=label
Set the label to select as default on the next boot
-r, --raid
Fall back to the next device on boot failure.
--reset-adv
Reset auxiliary data.
-S, --sectors=#
Force the number of sectors per track.
-U, --update
Updates a previous EXTLINUX installation.
-z, --zip
Force zipdrive geometry (-H 64 -S 32).
FILES
The extlinux configuration file needs to be named extlinux.conf and needs to be stored in the extlinux installation directory. For more
information about the contents of extlinux.conf, see syslinux(1) manpage, section files.
BUGS
I would appreciate hearing of any problems you have with SYSLINUX. I would also like to hear from you if you have successfully used SYS-
LINUX, especially if you are using it for a distribution.
If you are reporting problems, please include all possible information about your system and your BIOS; the vast majority of all problems
reported turn out to be BIOS or hardware bugs, and I need as much information as possible in order to diagnose the problems.
There is a mailing list for discussion among SYSLINUX users and for announcements of new and test versions. To join, send a message to
majordomo@linux.kernel.org with the line:
SEE ALSO
syslinux(1)
SYSLINUX for ext2/ext3 filesystem 18 December 2007 extlinux(1)