Hello everyone,
I'm trying to verify that TRIM is actually working on my dm-crypt (LUKS)
encrypted LVM volume with the following layers:
SSD (Crucial M4 128GB) -> LVM -> LUKS -> ext4
I followed the guide available at [1], which includes these steps:
1) create a random-filled file, sync to disk
2) fetch LBAs via 'hdparm --fibmap'
3) pick one sector, raw-read contents with 'hdparm --read-sector'
4) delete the file, sync to disk
5) re-read the sector chosen above, verify it contains zeroes
Unfortunately I already get a zeroed sector in step three:
> $ hdparm --read-sector 271984 /dev/sdd
>
> /dev/sdd:
> reading sector 271984: succeeded
> 0000 0000 0000 0000 0000 0000 0000 0000
> 0000 0000 0000 0000 0000 0000 0000 0000
> 0000 0000 0000 0000 0000 0000 0000 0000
> 0000 0000 0000 0000 0000 0000 0000 0000
> (...)
Is there any LBA-calculation I must do because of the LVM layer?
Regards,
lynix
[1]
http://techgage.com/article/enabling_and_testing_ssd_trim_support_under_linux/2
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