[gentoo-user] Re: Finally got a SSD drive to put my OS on

[Nikos Chantziaras <realnc@gmail.com>]

On 19/04/2023 04:45, Dale wrote:
> Filesystem created:       Sun Apr 15 03:24:56 2012
> Lifetime writes:          993 GB
> 
> That's for the main / partition.  I have /usr on it's own partition tho.
> 
> Filesystem created:       Sun Apr 15 03:25:48 2012
> Lifetime writes:          1063 GB
> 
> I'd think that / and /usr would be the most changed parts of the OS.
> After all, /bin and /sbin are on / too as is /lib*.  If that is even
> remotely correct, both would only be around 2TBs.  That dang thing may
> outlive me even if I don't try to minimize writes.  ROFLMBO

I believe this only shows the lifetime writes to that particular 
filesystem since it's been created?

You can use smartctl here too. At least on my HDD, the HDD's firmware 
keeps tracks of the lifetime logical sectors written. Logical sectors 
are 512 bytes (physical are 4096). The logical sector size is also shown 
by smartctl.

With my HDD:

   # smartctl -x /dev/sda | grep -i 'sector size'
   Sector Sizes:     512 bytes logical, 4096 bytes physical

Then to get the total logical sectors written:

   # smartctl -x /dev/sda | grep -i 'sectors written'
   0x01  0x018  6     37989289142  ---  Logical Sectors Written

Converting that to terabytes written with "bc -l":

   37988855446 * 512 / 1024^4
   17.68993933033198118209

Almost 18TB.