需要一些帮助来确定为什么这个磁盘运行得如此慢：
sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 1962 MB in 2.00 seconds = 982.96 MB/sec
Timing buffered disk reads: 90 MB in 3.03 seconds = 29.68 MB/sec
但
pi@raspberrypi:/ $ sudo dd if=/dev/zero of=/samba/tempfile bs=1M count=4096 conv=fdatasync,notrunc status=progress oflag=direct
skopiowane 1048576 bajtów (1,0 MB, 1,0 MiB), 17 s, **61,1 kB/s**
lsusb
Bus 001 Device 005: ID 0bda:9210 Realtek Semiconductor Corp. RTL9210 M.2 NVME Adapter
Bus 001 Device 003: ID 214b:7250 Huasheng Electronics USB2.0 HUB
pi@raspberrypi:/ $ sudo smartctl -a /dev/sda
smartctl 7.2 2020-12-30 r5155 [aarch64-linux-6.1.21-v8+] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Number: INTEL SSDPEKNW512G8L
Serial Number: BTNH93310F9Y512A
Firmware Version: L02C
PCI Vendor/Subsystem ID: 0x8086
IEEE OUI Identifier: 0x5cd2e4
Controller ID: 1
NVMe Version: 1.3
Number of Namespaces: 1
Namespace 1 Size/Capacity: 512 110 190 592 [512 GB]
Namespace 1 Formatted LBA Size: 512
Namespace 1 IEEE EUI-64: 5cd2e4 3891c09b51
Local Time is: Sun May 21 12:47:44 2023 CEST
Firmware Updates (0x14): 2 Slots, no Reset required
Optional Admin Commands (0x0017): Security Format Frmw_DL Self_Test
Optional NVM Commands (0x005f): Comp Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat Timestmp
Log Page Attributes (0x0f): S/H_per_NS Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg
Maximum Data Transfer Size: 32 Pages
Warning Comp. Temp. Threshold: 77 Celsius
Critical Comp. Temp. Threshold: 80 Celsius
Supported Power States
St Op Max Active Idle RL RT WL WT Ent_Lat Ex_Lat
0 + 3.50W - - 0 0 0 0 0 0
1 + 2.70W - - 1 1 1 1 0 0
2 + 2.00W - - 2 2 2 2 0 0
3 - 0.0250W - - 3 3 3 3 5000 5000
4 - 0.0040W - - 4 4 4 4 5000 9000
Supported LBA Sizes (NSID 0x1)
Id Fmt Data Metadt Rel_Perf
0 + 512 0 0
=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
SMART/Health Information (NVMe Log 0x02)
Critical Warning: 0x00
Temperature: 34 Celsius
Available Spare: 100%
Available Spare Threshold: 10%
Percentage Used: 9%
Data Units Read: 54 799 914 [28,0 TB]
Data Units Written: 37 073 270 [18,9 TB]
Host Read Commands: 979 354 517
Host Write Commands: 500 449 183
Controller Busy Time: 24 859
Power Cycles: 1 120
Power On Hours: 9 849
Unsafe Shutdowns: 728
Media and Data Integrity Errors: 0
Error Information Log Entries: 0
Warning Comp. Temperature Time: 0
Critical Comp. Temperature Time: 0
Thermal Temp. 1 Transition Count: 2189
Thermal Temp. 1 Total Time: 37949
Warning: NVMe Get Log truncated to 0x200 bytes, 0x200 bytes zero filled
Error Information (NVMe Log 0x01, 16 of 256 entries)
No Errors Logged
pi@raspberrypi:/ $ cat /etc/fstab |grep /samba /dev/disk/by-uuid/877a5afc-fc71-014f-bc05-5d459f5e9310 /samba ext4 rw，nofail，big_writes