Greg
Removing sync from the usbmount.conf file seems to have solved the problem
but I have no idea why! (and would be very interested in knowing) Especially
after reading the message in the file :
# WARNING! Removing "sync" from the options is a very bad idea and
# might result in severe data loss.
I also get more feed back doing a copy now than I used to.
#sudo time cp /srv/userdata/nathaniels/home/comtel.myo /media/usb0/
0.06user 1.91system 0:15.13elapsed 13%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+164minor)pagefaults 0swaps
Whats with the minor pagefaults anything to worry about?
Any other side effects of takig sync out of that options list beside the
need for a manual (or scripted) sync before pulling the drive?
Nathaniel
----Original Message Follows----
From: Greg KH <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
CC: linux-usb-users@lists.sourceforge.net
Subject: Re: [Linux-usb-users] Writing to USB2 HD at more than 1.2 mb/s
Date: Thu, 9 Feb 2006 21:22:44 -0800
On Fri, Feb 10, 2006 at 02:54:35PM +1000, Nathaniel Staples wrote:
> This is causing me me a lot of frustration.
>
> Am trying to get some external hard disks to work properly under Ubuntu
> 5.10. After much screwing around (for some reason they included very old
> usbmount packages) I have managed to get them to auto mount correctly and
> the there is no problem at all with the read speed (25 mb/s) But I cant
get
> it to write at more than 1.2 mb/s. I have recently taken over management
of
> the system and these hds were supposedly being to used for nightly
backups
> for the last year or so (they weren't even formatted). The system is used
> as a samba file server and has no graphical interface installed.
>
> usbtree shows that it is connected as a USB2 device (480 mb/s), hdparm
> gives 26 mb/s reads and practical tests with time show the same. I didn't
> notice a problem until I tried a manual run of my backups script and it
> took over 30 hours (started it on Friday afternoon). Haven't found a tool
> to test write speeds but practical tests with time are showing only 1.2
> mb/s. Obviously this isn't going to help me much when I have over 150g of
> data to backup every night.
>
> They are currently formatted ext3. I tested one formatted ntfs on a
windows
> computer and there was no problems with the transfer rates either
direction.
What kernel version are you using?
What is the output of 'mount' with the disk plugged in? Are you sure
the "sync" option isn't enabled for your disk?
thanks,
greg k-h
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