On 04/12/2020 01.20, Felix Miata wrote:
Below is all about SSD replaced via RMA March 2019 (original purchased July 2018).
Before receiving fresh RMA authorization from PNY, similar using two different PCs:
/dev/sda: Timing cached reads: 13832 MB in 1.99 seconds = 6940.82 MB/sec Timing buffered disk reads: 158 MB in 3.03 seconds = 52.19 MB/sec
After receiving RMA authorization from PNY, in preparation to return, wiping from /dev/zero the first 64 sectors, writing a new SSD GPT tables with 12 partitions, then wiping the first one of 7777 GB, and neither formatting nor attempting to mount any of them:
# hdparm -tT /dev/sdh
/dev/sdh: Timing cached reads: 16440 MB in 1.99 seconds = 8253.75 MB/sec Timing buffered disk reads: 1304 MB in 3.00 seconds = 434.25 MB/sec
When originally tested, hdparm -tT reported 8923 & 538 MB/sec.
Fstrim has been run weekly via timer.
Is there something about normal or abnormal usage that could account for the vastly reduced speed after 11 month's 24/7 uptime, then be significantly, but not entirely, relieved by clearing the existing partitions and writing new tables? Is there any reason not to proceed with the return
On rotating rust, you have to measure speed on the same partition each time. On SSD I do not know. The trim status would affect /write/ speed, I understand. And you say you run fstrim regularly. -- Cheers / Saludos, Carlos E. R. (from 15.1 x86_64 at Telcontar)