Write speed SAS 6GB

[Dalterix88]

Hello guys.

i have a question:

In a RAID 0 configuration on HPE GEN 8 servers, with P420 2GB Cache controller, what should be the write speed level? I ask because I did some tests and for example on a 4GB file it writes at 60mb / sec, is it an optimal speed in your opinion?

Best regards

Andrea

[ksram]

Hi,

Thank you for the Post.

Here the controller supports maximum speed : SAS Speed x8 6Gb/s SAS provides 4.8GB/s maximum bandwidth, where this will be depending on the multiple factors.

mainly depends on : 

1) HDD model 

2) Read / Write Ratio - Set on Smart Storage Administrator

Thank you

RamKS

[Dalterix88]

Hi RamKS , 

Here the model of my HDDs : 

https://www.servers4less.com/storage/hard-drives/netapp-x422-hcobe600a10

Here the cache ratio :

root@missaglia:/tmp# ssacli ctrl slot=2 modify cacheratio=?

Available options are:
0.
.
10% read / 90% write (current value)
.000000% read / 100% write
.
.
100% read / 0.000000% write

Values must be in increments of 5%

Best regards

Andrea

[ksram]

Hi,

Checking the details we see the speed is : 6Gb/s 2

But it may vary on other factors too.

If its the same speed from day 1 may be its the normal speed I guess, unless if you have different model and if you see the speed is more on different model.

Also you can try updating the Array Controller Firmware and or the Drive Firmware (if available)

Thank you

RamKS

[Smart-Tech]

49Y2003 IBM 600GB 10000RPM SAS 6Gbps Hot Swap 64MB Cache 2.5-inch Internal Hard Drive

Technical Specifications for 49Y2003

Model Manufacturer IBM Manufacturer Part # 49Y2003 Performance Product Type Internal Hard Drive Form Factor 2.5-inch Capacity 600 GB Cache 64 MB Spindle Speed 10000 RPM Drive Interface Type SAS 6.0 Gbps 0B23909 HGST Hitachi Ultrastar C10K600 600GB 10000RPM SAS 6Gbps 64MB Cache 2.5-inch Internal Hard Drive

Technical Specifications for 0B23909

Model Manufacturer Hitachi Manufacturer Part # 0B23909 Product Line Ultrastar Product Series C10K600 Performance Product Type Internal Hard Drive Form Factor 2.5-inch Capacity 600 GB Cache 64 MB Spindle Speed 10000 RPM Average Seek Time 3.7 ms Drive Interface Type SAS 6.0 Gbps Other Information Features

• Halogen-free Design
• Low Power Consumption
• Dual Stage Actuator (DSA)
• Advanced Power Management
• Rotational Vibration Safeguard (RVS)

[Moderator edit: Erased the confidential info.]