<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 10, 2022, 3:47 AM Stephen Worthington <<a href="mailto:stephen_agent@jsw.gen.nz">stephen_agent@jsw.gen.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Mon, 10 Jan 2022 07:31:26 +0800, you wrote:<br>
<br>
>Jim myth here:<br>
>SSD life is now so bad per cell (1000 or 10000 writes) ssd manufactures quote life in TBW.<br>
>The TBW spec depends directly on ssd size.<br>
>After 1/2 a year in use the projected life of my m2 is 40 years (regrettably more than mine :-)<br>
><br>
>Model Number: Samsung SSD 970 EVO Plus 2TB<br>
>Power On Hours: 3,741<br>
>Data Units Written: 29,494,374 [15.1 TB]<br>
><br>
>This is a cheap m2 (4 cell) at 600 TBW, you can get more expensive 1200 even 2400 TBW ssds.<br>
><br>
>James<br>
<br>
Another real life example:<br>
<br>
Model Number: Samsung SSD 950 PRO 256GB<br>
Namespace 1 Size/Capacity: 256,060,514,304 [256 GB]<br>
Namespace 1 Utilization: 95,130,853,376 [95.1 GB]<br>
Namespace 1 Formatted LBA Size: 512<br>
<br>
SMART/Health Information (NVMe Log 0x02)<br>
Critical Warning: 0x00<br>
Temperature: 45 Celsius<br>
Available Spare: 100%<br>
Available Spare Threshold: 10%<br>
Percentage Used: 9%<br>
Data Units Read: 360,516,312 [184 TB]<br>
Data Units Written: 228,579,4 h42 [117 TB]<br>
Host Read Commands: 5,169,492,455<br>
Host Write Commands: 2,354,847,145<br>
Controller Busy Time: 11,596<br>
Power Cycles: 282<br>
Power On Hours: 48,823<br>
Unsafe Shutdowns: 133<br>
Media and Data Integrity Errors: 0<br>
Error Information Log Entries: 3,246<br>
<br>
This is my main MythTV box - 5.5 years of 24/7 use on the SSD, and it<br>
is showing 9% of lifetime writes used. It is an older SSD and the Pro<br>
model that has better lifetime, but it gets a lot of database<br>
activity. I am pretty happy that it will last for quite a long while<br>
yet.<br>
<br>
If you want to record to the SSD, then you are likely to hit the<br>
lifetime write limit fairly rapidly. But just running MythTV and<br>
normal Linux on an SSD and there are no problems with lifetime. You<br>
still need to worry about it just dying unexpectedly, like any disk<br>
drive (or any electronics, for that matter).<br></blockquote></div></div><div dir="auto"><br></div><div dir="auto">What command are you using to get this SSD data.</div><div dir="auto"><br></div><div dir="auto">Jim A</div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"></blockquote></div></div></div>