[CentOS] persistent generic device for tape changer

[Helmut Drodofsky]

Hello Ron,

sounds good. I have 2 tape changer. I persume, udev creates the same
link for both.

Can I modify
SYMLINK+="changer-$env{ID_SERIAL}"

The serial should be unique.

Viele Grüße
Helmut Drodofsky

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Am 07.02.2019 um 16:17 schrieb Ron Loftin:
> On Thu, 2019-02-07 at 10:56 +0100, Helmut Drodofsky wrote:
>> Hello,
>>
>> mtx and therefor amanda use generic device /dev/sg<x> for tape
>> changer.
>>
>> These devices change on reboot.
>>
>> How to make them persistent?
>>
>> /dev/sch0 and /dev/sch1 seem to be persistent.
>>
>> /dev/tape/by-id/ shows links from WWID to generic device
>>
>> An UDEV rule could help? I have not found any example.
> I had a similar issue when I moved to Mint 18 with the tape device.
>  This works with kernel 4.10 and later.  Copy /lib/udev/rules.d/60-
> persistent-storage-tape.rules to /etc/udev/rules.d and make a change as
> shown:
>
> diff -n /lib/udev/rules.d/60-persistent-storage-tape.rules
> /etc/udev/rules.d/60-persistent-storage-tape.rules 
> d9 1
> a9 2
>    SYMLINK+="changer"
> #  SYMLINK+="tape/by-id/scsi-$env{ID_SERIAL}"
>
> This created /dev/changer as a link to the /dev/sg<x> device that will
> be consistent every time the system is booted.
>
>>