Slow HHD question

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1

Hi,

Maybe a bit off Nethserver topic, but i need you guys experience.
I noticed the my data disk [WD Red Plus, 12TB] is slow on writing.

The disk is mounted a VM datastore and accessible via Samba shares (Debian 11).
I did the test with the DD command and the speed i get is approx 22Mb/s

This doesnt look normal, but what can i do if there is something to do ?

Any advise is welcome

2

Did you already check the hardware, see also ESXi S.M.A.R.T. health monitoring for hard drives

Did you maybe enable compression or some other function that may slow down the disk?

3

Thanks for your supprt.

SMART looks enabled

esxcli storage core device smart get -d t10.ATA_____WDC_WD120EFBX2D68B0EN0___________________D7GATZAN____________
Parameter                          Value  Threshold  Worst  Raw
---------------------------------  -----  ---------  -----  ---
Health Status                      OK     N/A        N/A    N/A
Read Error Count                   0      16         N/A    0
Power-on Hours                     98     0          98     14802
Power Cycle Count                  26     0          N/A    26
Reallocated Sector Count           0      5          N/A    0
Drive Temperature                  33     0          N/A    197569675297
Sector Reallocation Event Count    0      0          N/A    0
Pending Sector Reallocation Count  0      0          N/A    0
Uncorrectable Sector Count         0      0          N/A    0

I’ve no clue what happend.
Nothing has changed beside that hardware.
I’ve swapped the HDD’s from the old server to the new server.

When i check a HDD on my spare GEN8 server it runs normal.
Putting it in the new it is slow.

My SDD are running normal, so it is only with the SATA HDD

4

Did you already try a different SATA Port?
There may be different speeds depending on the controller.

5

Yes. Tried port 2.3 and 4
On my GEN8 server the port 3 and 4 were indeed reduced in speed (SATA300)
The GEN11 are all the same

I hink i try to install VMware from scratch. Maybe a driver issue?

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6

Then maybe, before doing anything drastic, try updating the driver first?

7

I want to be sure that the VMware is not holding old hardware or something like.
Just installed a new VMware on a different disk and unfortunately the problem remains.
So i can exclude my VMware.

As far as i know everything is up to date.
I installed the latest bios (apr-2025) and latest SPP (apr-2025)
My VMware is HPE version of febr-2025

How can/must i update the driver and most importantly which one.
How can i identify the correct driver?

8

Guys,

It looks like i’ve found the problem.
I’ve converted the disk from lazily zeroed to agerly zeroed and now the disk performs normal
Took more than 4 days to convert the 12TB disk with something only 1% in 3-4 hours. Maybe something was not correct on the disk and is now set correctly

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