Re: [tlug] automating SCSI (SATA) device add/remove

[Kalin KOZHUHAROV <me.kalin@example.com>]

On Mon, Dec 6, 2010 at 14:33, Jawaad Mahmood <jawaad.mahmood@example.com> wrote:
> Would a python script for that help, or are you looking for a command to do it?
>
> (probably could make a bash shell for the same thing but I've never tried)

Hi Jawaad,
Well, a script can do it, I happen to run Gentoo most often so Python
is installed.

But I'd really prefer smarter approach, a command line (assuming I am
OK to do the off-by-one math).

Cheers,
Kalin.

> On 2010/12/06, at 14:03, Kalin KOZHUHAROV <me.kalin@example.com> wrote:
>> Hi,
>>
>> I have been pondering for quite some time at easy ways to automate
>> adding removal of SATA drives on my system with CLI.
>> I use different eSATA enclosures or SATA "drawers".
>>
>> Adding usually happens automatic, unless the drive happens to take too
>> long to initialize... then I have to find the device (`dmesg`), then
>> for a message like this:
>>
>>       [451944.216906] ata5: hard resetting link
>>
>> I have to do:
>>      echo "- - -" >/sys/class/scsi_host/host4/scan
>> (see the off-by-one, ata5 is host4)
>>
>>
>> When I want to properly stop the drive before removing it, I have to do:
>>    hdparm -Y /dev/sdc
>>   echo 1 >/sys/bus/scsi/devices/host4/target4\:0\:0/4\:0\:0\:0/delete
>>
>> Now, I got lost in /sys many times and I need help .... I guess there
>> is a shorter way from /dev/sdc to xyz/delete
>>
>> Can you point me to an easier way/command to do the following:
>>
>> 1. (attach) When I see "ata5: hard resetting link" do COMMAND ata5 and
>> have it rescan the host
>> 2. (detach) When I want to detach sdf, do COMMAND2 sdf and have it
>> powered down and remove the device from kernel

Cheers,
Kalin.