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Message: 11
Date: Tue, 05 Nov 2002 09:51:09 +0000
From: Ian David Flintoft <[EMAIL PROTECTED]>
Organization: University of York
To: [EMAIL PROTECTED]
Subject: [Linux-usb-users] USB HDD "works" but locks machine until finished
transfer
Hello,
I've just got a Lacie Pocket Drive USB 2.0 40 Gb HDD.
At the moment I've tried using the HDD only with USB1.1
controllers.
The disk is basically working however when I use it with
an ext2 filesystem mounted asynchronously it locks the
machine hard until the transfer is finished for data
transfers greater than a few 100 Mb's. If I mount
the partition with the sync option then it seems to
work reliably but at a very low rate - which isn't much
fun with a 40 GB HDD.
...
I haven't had time to play with other kernels yet so maybe
that is worth a try. I'll also try the verbose debugging
options in the USB system.
Anyone got any ideas or seen anything similar?
---
Hello Ian, I am having similar problems with USB2 on linux although my
problems are not exactly the same. I have been able to get a fairly stable
configuration using 2.4.20-pre10-ac2 which has most of the USB2 updates from
the 2.5 kernel backported to it. When I copy data to one drive (120GB
5400RPM Maxtor) I am getting more than 16MB/s and around 10.5MB/s over NFS.
That isn't bad since the machine is using 100Mbps fast ethernet, so the
maximum is 12.5MB/s. When I copy data between two storage devices on the
same USB2 controller I can consistently hang the machine. System load
shoots up to 60+ and the machine becomes completely unresponsive. Yesterday
I tried an experiment by installing a second USB2 controller and placing the
second storage device on that controller... copying data between the two
devices works fine now although it is much slower than it should be. (6MB/s
vs. 16+ MB/s) So the current kernels seem to enter a death spiral when
accessing two or more storage devices on the same controller at the same
time. I am hoping that these issues are resolved in a future kernel update.
Any kernel developers care to comment on this?
-Aaron
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