Re: Cheap NAS

[Tixy <tixy@yxit.co.uk>]

On Thu, 2022-10-20 at 17:41 +0700, Max Nikulin wrote:
> On 17/10/2022 22:50, Tixy wrote:
> >     # Set spindown time for disk
> >     if NAS1=`findmnt -n -o SOURCE /nas1/main`; then /sbin/hdparm -S120 $NAS1; fi
> >     
> > 
> > 
> > 
> > Rather than hard code the disk as /dev/sdc I use 'findmnt' to get the
> > disk name from the point it's mounted at (/nas1/main in this case).
> 
> Are there known problems with using e.g. WWN (/dev/disk/by-id/... in 
> /etc/hdparm.conf) for per-disk configuration?

I didn't know of /dev/disk/by-id/wwn-* file or of /etc/hdparm.conf
until I just googled that, that looks like they would be designed for
the task. Assuming however that you can rely on udev (?) having already
created those paths before hdparm is run. (I seem to remember having
had race conditions related to those paths in the past.)

In my case, I spread out wear by rotating disks through different uses:
main NAS drive, nearline backup mirror of that, and offline backup. So
I decided rather than mount by UUID or similar, I'd mount by filesystem
label instead, then I could just relabel the disks when I rotated them.

Of course, having just written that, I realise I don't need findmnt and
can just use the label in /dev/disk/by-label/ (again, assuming they
exist in time).

-- 
Tixy