The original post: /r/datahoarder by /u/NutWeevil on 2025-01-05 16:33:18.
Hi, Recently I backed up my western digital drive SN350 to a pc in local network (2.5Gbit ethernet)
the read speed were unstable between 5MB/s to 100MB/s (mostly bellow 20Mb/s)
I don't know if i can trust the drive, and i couldn't find the root cause. any help/idea will be much appreciated.
I tried to copy to local RAM drive (to check if the target is the problem) same speed. so it wasn't the target.
I tried to copy to the same target from another nvme drive, I got max bandwidth (~300MB/s) so its not the pc/background process or the copy method. I tried multiple copy method. rsync, teracopy (samba) same problem.
no errors on SMART. no errors from HD Sentinel.
I formatted the drive and I the speed are good now after short tests. i will update.
I got good result from crystal mark before and after the format. see below benchmark and smart data
the result below are after format but there were the same when i was ~90% full.
CrystalDiskMark 8.0.6 x64 (C) 2007-2024 hiyohiyo
Crystal Dew World: https://crystalmark.info/
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes
[Read]
SEQ 1MiB (Q= 8, T= 1): 3532.399 MB/s [ 3368.8 IOPS] < 2373.14 us>
SEQ 1MiB (Q= 1, T= 1): 2358.364 MB/s [ 2249.1 IOPS] < 444.22 us>
RND 4KiB (Q= 32, T= 1): 545.340 MB/s [ 133139.6 IOPS] < 236.11 us>
RND 4KiB (Q= 1, T= 1): 51.737 MB/s [ 12631.1 IOPS] < 78.98 us>
[Write]
SEQ 1MiB (Q= 8, T= 1): 2809.794 MB/s [ 2679.6 IOPS] < 2976.34 us>
SEQ 1MiB (Q= 1, T= 1): 2451.960 MB/s [ 2338.4 IOPS] < 427.13 us>
RND 4KiB (Q= 32, T= 1): 395.391 MB/s [ 96531.0 IOPS] < 330.29 us>
RND 4KiB (Q= 1, T= 1): 196.355 MB/s [ 47938.2 IOPS] < 20.74 us>
Smart info:
(02) WD Green SN350 1TB
Model : WD Green SN350 1TB
Firmware : 33006000
Serial Number : ************
Disk Size : 1000.2 GB
Interface : NVM Express
Standard : NVM Express 1.4
Transfer Mode : PCIe 3.0 x4 | PCIe 3.0 x4
Power On Hours : 1567 hours
Power On Count : 923 count
Host Reads : 2647 GB
Host Writes : 2587 GB
Temperature : 42 C (107 F)
Health Status : Good (100 %)
Features : S.M.A.R.T., TRIM, VolatileWriteCache
Drive Letter : E:
-- S.M.A.R.T. --------------------------------------------------------------
ID RawValues(6) Attribute Name
01 000000000000 Critical Warning
02 00000000013B Composite Temperature
03 000000000064 Available Spare
04 00000000000A Available Spare Threshold
05 000000000000 Percentage Used
06 00000054BAB4 Data Units Read
07 00000052CAE8 Data Units Written
08 00000135473A Host Read Commands
09 000000FCBEF7 Host Write Commands
0A 00000000029E Controller Busy Time
0B 00000000039B Power Cycles
0C 00000000061F Power On Hours
0D 000000000015 Unsafe Shutdowns
0E 000000000000 Media and Data Integrity Errors
0F 000000000010 Number of Error Information Log Entries