Bad ZFS Write Performance

[cscheat]

Hi guys..

I am new and need some help here.

Running ZFS file system.

My Setup:
Asus H270 Plus
G4560 Intel
WD Green SSD 120gb x 3 pcs

I am running an UBUNTU File Server VM in my PVE.

Transfer Files from UBUNTU File Server VM to Local Network PC = FAST (107MB/s)


Transfer Files from Local Network PC to UBUNTU File Server VM = SLOW (Very fast at the beginning.. however speed keep going up & down.. like a Zig Zag)

• I disabled Sync
• enabled Compression
• Tried Raid0 or RaidZ
• Upgraded my memory from DDR3 8gb to DDR4 16GB
• Upgraded processor
• Upgraded Motherboard

Nothing works....

Appreciate if anyone can help out...

 

[wolfgang]

Hi,

I don't know this disk but the sawtooth pattern indicates a cache that gets full.
Do you have a Raid Card on this system?

How fast the WD green and are they stable over 60 sec?

try this command to test a single disk.
This test destroys(override) the data on this disk.

 fio --bs=4k --rw=randwrite --direct=1 --sync=1 --runtime=60  --ramp_time=10 --name=4kwrite --group_reporting --file=/dev/sd<x>

 

[cscheat]

Hi,

I don't know this disk but the sawtooth pattern indicates a cache that gets full.
Do you have a Raid Card on this system?

How fast the WD green and are they stable over 60 sec?

try this command to test a single disk.
This test destroys(override) the data on this disk.

fio --bs=4k --rw=randwrite --direct=1 --sync=1 --runtime=60  --ramp_time=10 --name=4kwrite --group_reporting --file=/dev/sd<x>

Hi Wolfgang!

Thank you for the reply.

I do not have a raid card.

I will try it and see how it goes

 

[LnxBil]

I also have some WD Green flying around here, they're cheap SSDs for consumers and not good for ZFS and no, not even for a home environment.

BTW: I have much better performance on enterprise HDDs (not even SSDs) with ZFS than you with your setup here.