Arch Linux

theking2

Banned

From: Romanshorn Switzerland

Registered: 2009-03-04

Posts: 372

[SOLVED] discard

My samsung SSD does not understand discard (it is a bit old).

Yet:

$ dmesg -T | grep discard
[Thu Aug 28 22:01:30 2014] EXT4-fs (sde3): mounting with "discard" option, but the device does not support discard
[Thu Aug 28 22:01:32 2014] EXT4-fs (sde1): mounting with "discard" option, but the device does not support discard
[Thu Aug 28 22:01:32 2014] EXT4-fs (sde4): mounting with "discard" option, but the device does not support discard

but

$ grep discard /etc/fstab

no result

What else could cause the system to attempt a discard?

Last edited by theking2 (2014-12-16 19:25:59)

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archlinux on a Gigabyte C1037UN-EU, 16GiB
a Promise  PDC40718 based ZFS set
root on a Samsung SSD PB22-J
running LogitechMediaServer(-git), Samba, MiniDLNA, TOR

R00KIE

Forum Fellow

From: Between a computer and a chair

Registered: 2008-09-14

Posts: 4,734

Re: [SOLVED] discard

Try as root: 'dumpe2fs -h /dev/sdXY | grep discard'. I suspect you will see a discard there somewhere, probably in the default mount options.

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R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

theking2

Banned

From: Romanshorn Switzerland

Registered: 2009-03-04

Posts: 372

Re: [SOLVED] discard

It seems indeed that this SSD is so old it does not support discard.

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archlinux on a Gigabyte C1037UN-EU, 16GiB
a Promise  PDC40718 based ZFS set
root on a Samsung SSD PB22-J
running LogitechMediaServer(-git), Samba, MiniDLNA, TOR