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Special Forums Hardware Filesystems, Disks and Memory Poor read performance on sun storedge a1000 Post 302301483 by mbrenner on Friday 27th of March 2009 03:02:29 AM
Old 03-27-2009
Poor read performance on sun storedge a1000

Hello,

i have a a1000 connected to an e6500. There's a raid 10 (12 disks) on the a1000.
If i do a
dd if=/dev/zero of=/mnt/1 bs=1024k count=1000
and then look at iostat it tells me there's a kw/s of 25000.

But if i do a
dd of=/dev/zero if=/mnt/1 bs=1024k count=1000
then i see only a rw/s of 13000.

So the read performance is smaller then the write performance?

Can someone tell me what i am doing wrong?
Regards
 

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MSDOSFS(5)						      BSD File Formats Manual							MSDOSFS(5)

NAME
msdosfs -- MS-DOS file system SYNOPSIS
options MSDOSFS DESCRIPTION
The msdosfs driver will permit the FreeBSD kernel to read and write MS-DOS based file systems. The most common usage follows: mount -t msdosfs /dev/ada0sN /mnt where N is the partition number and /mnt is a mount point. Some users tend to create a /dos directory for msdosfs mount points. This helps to keep better track of the file system, and make it more easily accessible. It is possible to define an entry in /etc/fstab that looks similar to: /dev/ada0sN /dos msdosfs rw 0 0 This will mount an MS-DOS based partition at the /dos mount point during system boot. Using /mnt as a permanent mount point is not advised as its intention has always been to be a temporary mount point for floppy and ZIP disks. See hier(7) for more information on FreeBSD direc- tory layout. SEE ALSO
mount(2), unmount(2), mount(8), mount_msdosfs(8), umount(8) AUTHORS
This manual page was written by Tom Rhodes <trhodes@FreeBSD.org>. BSD
October 1, 2013 BSD
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