January 14, 20233 yr Apparently it's a not uncommon issue with SSDs that slow down reading old files due to flash cell voltage for files that are over 3 months old. Discussion links on this issue at the end. Anybody have ideas about how to find SSDs that don't have this issue? Or SSDs that do have it? Advertisement terms, SLC vs MLC, some info in datasheets somewhere? Even some relatively new SSDs with 3 GB read/write speeds have this issue. I run my unraid off of 1 GbE so I don't care for speeds above 200 MB/s. Or any reviewers that do a long term review that look at this? I suppose it's not a common use case as many games get updated. Only thing I've found so far is that Samsung is the only manufacturer that deals with this, either through higher quality chips or at least in the 840 drives, firmware that likely refreshes old data occasionally at the cost of wear. It seems like some drives from WD, Corsair, and Teamgroup have this issue. While the 840's and the Corsair model dropped like a rock after ~3 months, WD model looks to appear to slow down gradually from 4 months to a year and maintain decent speeds. I also discovered this effects parts of files, e.g. for files that are constantly appended to, the early files remain intact and are slow. I have long running duplicati backups running with sqlite databases where this occurs. I always wondered why speeds got slower and slower, and it turns out the beginning blocks of the file are read incredibly slow. The most obvious use case was running an old VM in unRAID that I only spin up for specific use cases. Any old docker commits on images probably also have this issue but perhaps less noticeable if the layers get completely updated. Reading material: https://www.overclock.net/threads/read-speeds-dropping-dramatically-on-older-files-benchmarks-needed-to-confirm-affected-ssds.1512915/ https://linustechtips.com/topic/1275489-western-digital-ssds-experiencing-read-performance-degradation/ https://www.reddit.com/r/techsupport/comments/n438uo/wd_blue_ssd_exceptionally_slow/ https://www.overclock.net/threads/corsair-mp510-980gb-slooooooooow-with-older-files-like-7-10mb-s-read-speed-slow.1801829/ https://www.overclock.net/threads/read-speeds-dropping-dramatically-on-older-files-benchmarks-needed-to-confirm-affected-ssds.1512915/page-45#post-28976970 https://www.reddit.com/r/techsupport/comments/10bgcv0/ssd_read_speeds_slow_except_for_new_files/ Edited January 27, 20233 yr by robobub
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