Hi,

 

Could someone please take a look at my drive speeds, as you can see all my drives appear (in my opinion) normal for read and write except my brand new HUS726060AL5210 Helium filled SAS drive with an awful 46mb/s write speed! but it does have the fastest read of all my disks.

 

You can see it shares a controller with normal SATA drives on the same port so do I have a dodgy drive or a setup issue?

 

Judging By the results of the write speed of the Barracuda Pro (Disk 5) this is what I will use as my parity but maybe move it to it's own controller?

 

I started all this investigation due to replacing my parity drive with the HGS SAS Drive but getting approximately 20-30mb/s rebuild speed

 

I have also attached my diagnostics if any help!

 

Many Thanks

 

M/B: ASUSTeK COMPUTER INC. - MAXIMUS V FORMULA
CPU: Intel® Core™ i7-3770K CPU @ 3.50GHz
HVM: Enabled
IOMMU: Disabled
Cache: 256 kB, 1024 kB, 8192 kB
Memory: 20 GB (max. installable capacity 32 GB)
Network: eth0: 1000 Mb/s, full duplex, mtu 1500 eth1: 10000 Mb/s, full duplex, mtu 9000
Kernel: Linux 4.18.20-unRAID x86_64
OpenSSL: 1.1.1a

 

Tests were carried out in Krusader using a KINGSTON_SV300S37A480G SSD connected to the 
Intel® Z77 Serial ATA 6.0 Gb/s (On Board Controller) as the source & destination with no parity drive and using an 8GB Test File.

Here are the results

 

Intel® Z77 Serial ATA 6.0 Gb/s (On Board Controller)
Disk 1 WDC_WD30EFRX-68EUZN0 (3TB)     140.7 mb/s (READ) 146.6 mb/s (WRITE)
    
Asmedia® Z77 Serial ATA 6.0 Gb/s (On Board Controller)
Disk 6 TOSHIBA_HDWD130 (3TB)               196.9 mb/s (READ) 192.2 mb/s (WRITE)
Disk 9 ST3000DM008-2DM166 (3TB)         213.9 mb/s (READ) 201.0 mb/s (WRITE)

 

LSI SAS2008 In PCI-e SLOT 1 Set to GEN2 X8
Disk 2 TOSHIBA_HDWD130 (3TB)                192.7 mb/s (READ) 188.1mb/s (WRITE)
Disk 3 TOSHIBA_HDWD130 (3TB)                193.1 mb/s (READ) 193.6mb/s (WRITE)
Disk 4 TOSHIBA_HDWD130 (3TB)                193.0 mb/s (READ) 184.0mb/s (WRITE)
Disk 5 ST6000DM004-2EH11C (6TB)           224.5 mb/s (READ) 235.4mb/s (WRITE)
Disk 7 TOSHIBA_HDWD130 (3TB)                196.9 mb/s (READ) 172.1mb/s (WRITE)
Disk 8 ST3000DM008-2DM166 (3TB)          199.2 mb/s (READ) 184.8mb/s (WRITE)
Disk 10 ST6000VN0033-2EE110 (6TB)         217.1 mb/s (READ) 222.8mb/s (WRITE)
Disk 11 ST6000DM003-2CY186 (6TB)          170.2 mb/s (READ) 204.4mb/s (WRITE)
Disk 12 HUS726060AL5210 (6TB)               227.9 mb/s (READ)  46.7mb/s (WRITE)
 

 

 

 

unraidserver-diagnostics-20190124-2206.zip

Edited January 24, 20197 yr by mbc0

So bad got controller and SAS disk problem.

4 minutes ago, Benson said:

So bad got controller and SAS disk problem.

Can you elobrate please?

Check if write cache is enable, some SAS drives have it disable by default, for example:

 

you are a star @johnnie.black ! I had already found some threads discussing it and looked for it in the card's bios which didn't exist, I never found that thread you had posted above... Many thanks I am now writing at 240mb/s 🙂

 

Can I also just ask when I copy disk to disk on my SAS2008 controller (the SAS drive in question is on that controller) the speeds drop right down from 180mb/s + to 20-30mb/s would it be best practice to have the parity drive on it's own controller for that reason or am I overthinking it?

 

Thanks Again!

Unraid doesn't really perform well copying disk to disk, because of how parity works, changing parity to another controller shouldn't make any difference, you should get a little boost from turbo write, but not much.

Those speeds I am talking about is with no parity disk so would be worse with parity! 

 

I will go ahead and use the new SAS drive as parity as it is the best performing disk in my system.

 

Again... Thanks

@johnnie.black have provide solution in other thread before, but haven't remember, refresh again.