[mythtv-users] Building a new MythTV Backend for 2022

[James Linder]

> On 10 Jan 2022, at 5:37 pm, James Abernathy <jfabernathy at gmail.com> wrote:
> 
> 
> 
> On Mon, Jan 10, 2022, 3:47 AM Stephen Worthington <stephen_agent at jsw.gen.nz> wrote:
> On Mon, 10 Jan 2022 07:31:26 +0800, you wrote:
> 
> >Jim myth here:
> >SSD life is now so bad per cell (1000 or 10000 writes) ssd manufactures quote life in TBW.
> >The TBW spec depends directly on ssd size.
> >After 1/2 a year in use the projected life of my m2 is 40 years (regrettably more than mine :-)
> >
> >Model Number:                       Samsung SSD 970 EVO Plus 2TB
> >Power On Hours:                     3,741
> >Data Units Written:                 29,494,374 [15.1 TB]
> >
> >This is a cheap m2 (4 cell) at 600 TBW, you can get more expensive 1200 even 2400 TBW ssds.
> >
> >James
> 
> Another real life example:
> 
> Model Number:                       Samsung SSD 950 PRO 256GB
> Namespace 1 Size/Capacity:          256,060,514,304 [256 GB]
> Namespace 1 Utilization:            95,130,853,376 [95.1 GB]
> Namespace 1 Formatted LBA Size:     512
> 
> SMART/Health Information (NVMe Log 0x02)
> Critical Warning:                   0x00
> Temperature:                        45 Celsius
> Available Spare:                    100%
> Available Spare Threshold:          10%
> Percentage Used:                    9%
> Data Units Read:                    360,516,312 [184 TB]
> Data Units Written:                 228,579,4 h42 [117 TB]
> Host Read Commands:                 5,169,492,455
> Host Write Commands:                2,354,847,145
> Controller Busy Time:               11,596
> Power Cycles:                       282
> Power On Hours:                     48,823
> Unsafe Shutdowns:                   133
> Media and Data Integrity Errors:    0
> Error Information Log Entries:      3,246
> 
> This is my main MythTV box - 5.5 years of 24/7 use on the SSD, and it
> is showing 9% of lifetime writes used.  It is an older SSD and the Pro
> model that has better lifetime, but it gets a lot of database
> activity.  I am pretty happy that it will last for quite a long while
> yet.
> 
> If you want to record to the SSD, then you are likely to hit the
> lifetime write limit fairly rapidly.  But just running MythTV and
> normal Linux on an SSD and there are no problems with lifetime.  You
> still need to worry about it just dying unexpectedly, like any disk
> drive (or any electronics, for that matter).
> 
> What command are you using to get this SSD data.
> 

Jim you want the smartmontools
Then sudo-or-# smartctl -a /dev/disk-device
and there is heaps more online offline tests, automatic notifaction etc

James