enable discard mount option in /etc/fstab by default #367

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1. mika commented on Jan 13, 2026

   

   mika

   on Jan 13, 2026

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   Is there any known drawback or possible if discard is present but not support by the underlying stack?
2. evgeni commented on Jan 13, 2026

   

   evgeni

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   fstrim advises against discard: https://man7.org/linux/man-pages/man8/fstrim.8.html#DESCRIPTION

   (No idea how much of this is applicable to VMs)

   👍React with 👍1Reacted by Michael Prokop
3. mika

   changed the title [-]enable discard mount option by default in /etc/fstab by default[/-] [+]enable discard mount option in /etc/fstab by default[/+] on Jan 13, 2026
4. mika commented on Jan 13, 2026

   

   mika

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   I'm afraid, managing /etc/fstab is an exercise for the admin with configuration management etc, depending on the actually used stack, and we can't just enable this by default?

   @zeha, what's your take on this?
5. evgeni commented on Jan 13, 2026

   

   evgeni

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   If the intent is to shrink VM images, should we call fstrim as the last step when running in VM mode?

   👍React with 👍1Reacted by Chris Hofstaedtler
6. mika commented on Jan 14, 2026

   

   mika

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   If the intent is to shrink VM images, should we call fstrim as the last step when running in VM mode?

   I like that idea, thx! @adrelanos did you look into this already?
7. mika commented on Feb 11, 2026

   

   mika

   on Feb 11, 2026

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   We don't plan to enable discard in fstab by default, but we're considering the fstrim approach, see #369
8. mika

   closed this as completedon Feb 11, 2026