Re: [smartmontools-support] atacb / usbcypress with multiple devices

[matthieu c. <cas...@fr...>]

Hi,

Georg Sassen wrote:
> Hi,
> 
> I have a Linksys NSLU2 running debian etch, with kernel 2.6.18-6-ixp4xx.
> There are 4 external harddrives connected to it, two of them in a case
> for two drives (sharkoon twindrive), the other two in single cases, all
The other 2 cases are the same or different models ?
> of them with cypress chipset, connected behind a Genesys USB 2.0
> hub. The drives are all Samsung IDE drives, from 250 to 300 GB.

What's the mapping of the devices (ie sdx master on dual case, sdy slave 
on dual case, ...) ?
You have four disks, which ones are dual case, which ones on single case.


> The problem: smartctl can only talk to /dev/sde, not to the others. Here
> is one of the drives that don't work:
sda is the main disk and sd[b-e] are the usb one ?
So only the last disk work ?
What happen if you plug only sdb ?

> 
> Any ideas why it doesn't seem to work with multiple drives?
No, the only reason I see at the moment is that the cypress controllers 
of your different cases are not the same : either some controllers 
doesn't support atacb or are configured for a different atacb magic.
As they didn't care to change the usb id, I don't see why they will 
change the magic.


Matthieu

PS I didn't do any test where there is 2 disks on the same controller.