SB-RKT4P-4TB slower read speeds in linux over time

• l

  linuxssd

  10/8/25, 1:48 PM

  I have two SB-RKT4P-4TB SSDs running on a Linux system with kernel 6.2.0-37-generic

  The speed was originally fine on them a couple of years ago, but the drives have been getting noticebly slower and slower over time.  Usage patterns have not changed.  Originally when I started/opened OpenOffice for the first time it would display the initial splash-dialog in less than a second, but now it takes a solid 5-10 seconds.

  Smartctl yields no errors.  Trim is enabled and has been running weekly - most recent result:

  Oct 06 00:03:42 mint2 fstrim[2657178]: /: 80.2 GiB (86149525504 bytes) trimmed on /dev/nvme0n1p2

  Used fio for some randread tests on them:

  fio --name=read_iops --directory=. --size=10G \
  --time_based --runtime=20s --ramp_time=2s --ioengine=libaio --direct=1 \
  --verify=0 --bs=4K --iodepth=64 --rw=randread --group_reporting=1

  results are very similar between the two:

  read: IOPS=349k, BW=1362MiB/s (1428MB/s)(26.6GiB/20001msec)

  read: IOPS=342k, BW=1337MiB/s (1402MB/s)(26.1GiB/20001msec)

  My understanding is that these drives should be much closer to 6000MB/s  rather than 1400MB/s

  Please advise

   

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• TS

  The Sabrent Informer Admin Staff

  10/9/25, 4:27 PM

  Hello @linuxssd, 
  
  The fio test you ran measured small-block random read performance (4K blocks, high queue depth). These results are normal for that workload and do not reflect the drive’s maximum sequential read throughput. To evaluate the expected performance, you’ll need to run a large-block sequential read test. 
  
  Regarding your application slowdown issue, I will check in with the team and let you know if I can find a resolution. 

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