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Subject: Re: hdparm and removable IDE?
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Ron House <house@usq.edu.au>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Wed, 2003-03-26 at 04:41, Ron House wrote:
> The scenario: I have a ViPower hot-swap mobile rack for swapping IDE HDs 
> on the fly. I am assuming that this device properly disconnects the 
> hardware and that I am faced with a software problem. Our technical 
> staff tell me that they have 'tested' hot swapping under RedHat 7.3 
> (Kernel 2.4.18-3) and it 'works'. In other words, they unmounted, 
> swapped, and mounted a new disk and didn't observe data loss. I am sure

IDE hotswap at drive level is not supported by Linux. It might work ok. 
Providing you shut the drive down fully and flush the cache before you
unregister/unplug and replug before registering the new interface

> Here are a few other factoids that may be relevant. This utility comes 
> with Windoze drivers to set up hot-swapping. I installed them and they 
> worked, but immediately Partition Magic started crashing Windoze 
> whenever it was run. This behaviour even continued after uninstallation 
> of the hot-swap drivers. Furthermore, at that point Linux started 
> producing lines like this in /var/log/messages:
> 
> Mar 26 13:35:44 Loris kernel: hdd: dma_intr: status=0x51 { DriveReady 
> SeekComplete Error }
> Mar 26 13:35:44 Loris kernel: hdd: dma_intr: error=0x84 { 
> DriveStatusError BadCRC }

Looks like it left the drive misprogrammed

Alan

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