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Special Forums Hardware Filesystems, Disks and Memory Poor read performance on sun storedge a1000 Post 302302357 by TonyFullerMalv on Monday 30th of March 2009 07:00:29 PM
Old 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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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)
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