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.
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-$env{ID_SERIAL}"
This created /dev/changer as a link to the /dev/sg<x> device that will be consistent every time the system is booted.
Hello Ron,
sounds good. I have 2 tape changer. I persume, udev creates the same link for both.
Can I modify SYMLINK+="changer-$env{ID_SERIAL}"
The serial should be unique.
Viele Grüße Helmut Drodofsky
Internet XS Service GmbH Heßbrühlstraße 15 70565 Stuttgart
Geschäftsführung Helmut Drodofsky HRB 21091 Stuttgart USt.ID: DE190582774 Fon: 0711 781941 0 tel:+497117819410 Fax: 0711 781941 79 Mail: info@internet-xs.de www.internet-xs.de 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-$env{ID_SERIAL}"
This created /dev/changer as a link to the /dev/sg<x> device that will be consistent every time the system is booted.
I've taken you as far as I can go. Now you will have to experiment a bit for your use case. I should point out that at least in my system, the link with the serial number in it shows up even with the line commented in the rules file.
As always, YMMV.
On Thu, 2019-02-07 at 22:29 +0100, Helmut Drodofsky wrote:
Hello Ron,
sounds good. I have 2 tape changer. I persume, udev creates the same link for both.
Can I modify SYMLINK+="changer-$env{ID_SERIAL}"
The serial should be unique.
Viele Grüße Helmut Drodofsky
Internet XS Service GmbH Heßbrühlstraße 15 70565 Stuttgart
Geschäftsführung Helmut Drodofsky HRB 21091 Stuttgart USt.ID: DE190582774 Fon: 0711 781941 0 tel:+497117819410 Fax: 0711 781941 79 Mail: info@internet-xs.de www.internet-xs.de 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-$env{ID_SERIAL}"
This created /dev/changer as a link to the /dev/sg<x> device that will be consistent every time the system is booted.
CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Am 08.02.2019 um 00:13 schrieb Ron Loftin reloftin@twcny.rr.com:
On Thu, 2019-02-07 at 22:29 +0100, Helmut Drodofsky wrote:
Hello Ron,
sounds good. I have 2 tape changer. I persume, udev creates the same link for both.
Can I modify SYMLINK+="changer-$env{ID_SERIAL}"
The serial should be unique.
Viele Grüße Helmut Drodofsky
I've taken you as far as I can go. Now you will have to experiment a bit for your use case. I should point out that at least in my system, the link with the serial number in it shows up even with the line commented in the rules file.
As always, YMMV.
Maybe
.... ATTRS{serial}=="likethis16c07338d2a294c" , SYMLINK+="mybackup/changer1" ...
and for the second one
... ATTRS{serial}=="likethis9ae76c073f5ccb8" , SYMLINK+="mybackup/changer2" ...
?
-- LF
Good evening,
my final solution: SUBSYSTEM=="scsi_generic", SUBSYSTEMS=="scsi", ATTRS{type}=="8", ATTRS{model}=="MAGNUM 224 ", IMPORT{program}="scsi_id --sg-version=3 --export --whitelisted -d $devnode", \ SYMLINK+="changer0"
SUBSYSTEM=="scsi_generic", SUBSYSTEMS=="scsi", ATTRS{type}=="8", ATTRS{model}=="FlexStor II ", ATTRS{rev}=="5.11", IMPORT{program}="scsi_id --sg-version=3 --export --whitelisted -d $devnode", \ SYMLINK+="changer1"
SUBSYSTEM=="scsi_generic", SUBSYSTEMS=="scsi", ATTRS{type}=="8", ATTRS{model}=="FlexStor II ", ATTRS{rev}=="5.50", IMPORT{program}="scsi_id --sg-version=3 --export --whitelisted -d $devnode", \ SYMLINK+="changer2"
Very helpful:
/dev/sch0, /dev/sch1, /dev/sch2 are persistent devices - but not generic devices.
udevadm info -a /dev/sch0 shows all possible attributes in the udev rules key format.
best regards
Helmut
Viele Grüße Helmut Drodofsky
Internet XS Service GmbH Heßbrühlstraße 15 70565 Stuttgart
Geschäftsführung Helmut Drodofsky HRB 21091 Stuttgart USt.ID: DE190582774 Fon: 0711 781941 0 tel:+497117819410 Fax: 0711 781941 79 Mail: info@internet-xs.de www.internet-xs.de Am 08.02.2019 um 12:21 schrieb Leon Fauster via CentOS:
Am 08.02.2019 um 00:13 schrieb Ron Loftin reloftin@twcny.rr.com:
On Thu, 2019-02-07 at 22:29 +0100, Helmut Drodofsky wrote:
Hello Ron,
sounds good. I have 2 tape changer. I persume, udev creates the same link for both.
Can I modify SYMLINK+="changer-$env{ID_SERIAL}"
The serial should be unique.
Viele Grüße Helmut Drodofsky
I've taken you as far as I can go. Now you will have to experiment a bit for your use case. I should point out that at least in my system, the link with the serial number in it shows up even with the line commented in the rules file.
As always, YMMV.
Maybe
.... ATTRS{serial}=="likethis16c07338d2a294c" , SYMLINK+="mybackup/changer1" ...
and for the second one
... ATTRS{serial}=="likethis9ae76c073f5ccb8" , SYMLINK+="mybackup/changer2" ...
?
-- LF _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
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