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solamour
l33t
Joined: 21 Dec 2004
Posts: 727
Location: San Diego, CA
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 Posted: Mon Dec 19, 2022 9:33 pm Post subject: [Solved] Q: Use UUID with hdparm? |
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I use hdparm to spin down an external disk after the disk is idle for a while.
| Code: | [/etc/conf.d/hdparm]
sdc_args="-S 241" |
Whenever the system boots, the disk gets a random letter; it's usually "sdc", but often it's "sdb" or "sde".
Is there a way to assign a disk with a specific UUID to a certain letter? Or better yet, how do I configure hdparm to look for a disk with a specific UUID?
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sol
Last edited by solamour on Mon Dec 19, 2022 10:34 pm; edited 1 time in total |
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alamahant
Advocate
Joined: 23 Mar 2019
Posts: 3953
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| Posted: Mon Dec 19, 2022 10:06 pm Post subject: |
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Plz use
| Code: |
hdparm <> /dev/disk/by-id/xxxxxxxxxxxxx
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but not in /etc/conf.d/hdparm.
Find the correct entry by
| Code: |
ls -l /dev/disk/by-id
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Use it either in an /etc/local.d/hdparm.start script or a cronjob @reboot.
| Code: |
hdparm -S 241 /dev/disk/by-id/xxxxxxxxxxxxx
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 23145
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| Posted: Mon Dec 19, 2022 10:18 pm Post subject: |
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| The /etc/init.d/hdparm script that consumes this conf.d file is very simple. It does not support using UUIDs. It only works on block devices of a few well known paths. You might be able to use a udev rule to force the device to have a particular name. You could also consider an enhancement request to make the init script able to work with the by-id path that alamahant suggested. |
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solamour
l33t
Joined: 21 Dec 2004
Posts: 727
Location: San Diego, CA
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| Posted: Mon Dec 19, 2022 10:34 pm Post subject: |
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I put hdparm command with "by-uuid" in "local" script, which seems to work fine.
| Code: | [/etc/local.d/local.start]
hdparm -S 241 /dev/disk/by-uuid/... |
Thanks everyone for taking time to share your knowledge and suggestions.
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sol |
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sublogic
Guru
Joined: 21 Mar 2022
Posts: 316
Location: Pennsylvania, USA
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| Posted: Mon Dec 19, 2022 10:49 pm Post subject: |
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The right way would be to muck with udev rules --which I have no idea how to do.
As an alternative, you could ignore the hdparm service and do it instead from a shell script in /etc/local.d . The script can run hdparm on a block device under /dev/disk/by-id/ . Use one of the entries labeled by model number and serial number. (And add the local service to the default runlevel.)
Oops, three replies while I was typing. Oh well. |
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Zucca
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Joined: 14 Jun 2007
Posts: 3963
Location: Rasi, Finland
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| Posted: Tue Dec 20, 2022 8:55 am Post subject: |
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| sublogic wrote: | | The right way would be to muck with udev rules --which I have no idea how to do. |
Yes. I think so.
A udev rule which (if possible) matches all the external drives, and then runs a command to adjust whatever user wants.
A more brute forced way would be write an udev rule to catch all drives, then a run a script to determine if the drive is a) spinning one b) external.
Third option could be to use inotify to watch /dev/ , but I don't know if it can work on devfs. Also it's a dirty hack if it works.
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