Hi,
I'm using the following system:
I was concerned about the Load Cycle Count (LCC), so I decided to use WDIDEL3 on those 3 disks.
But I was curious about the effect it would have on the numbers coming out therefore I made some tests and thought I could share the results on the forum.
So I have 6 disks: 3 seagate and 3 WD green.
In the results I'll only take one seagate as reference and the 3 WD green.
The first numbers I started with were:
- for the seagate:
- for the WD Green:
The first thing I did was to cool down the seagate drives! ;-)
(here only one of the seagate is shown but they were around 44-46°C)
I'll have to do something for the WD as well since they are quite close to 40-42°C.
Rather than giving a table full of numbers, I tried to put that in a graph.
The X axis shows the hours between each samples and the Y axis shows the LCC hourly rate.
I had the system running for some hours and got the following results:
- for the seagate, an LCC increase of 0 LCC/hr
- for the WD, an LCC increase of 25/35 LCC/hr (regardless from the APM settings)
First I tried to play around with the Advanced Power Management settings (in the FreenNAS GUI) of each drive (for the WDs).
I set two WD drives with APM at 254, one WD drive with APM at 192 and didn't notice any change in the LCC rate (within 48 hours).
Then I changed the LLC settings on the WD drives (using WDIDLE3).
I kept one drive unchanged (as reference, i.e. at 8s), one disabled and one set at 300s.
I immediately saw the difference:
- the two drives with the LCC timer changed dropped to 0LLC/hr
- the reference WD drive (with the LLC timer at 8s) continued with a rate of 35LCC/hr
Some thoughts:
- I'm surprised that both drives (with LLC timer disabled and LCC timer set at 300s) droped at 0LCC/hr. I would have expect eventually some differences in the numbers...
- I don't explain the drop at around 15LCC/hr (for all the WD drives) when the LCC timer has been changed (see on the graph).
- I don't explain the increase in the LCC rate for the drive with the timer set at 8s (the two last samples show an LCC rate over 55LCC/hr in the last 3 days).
As a conclusion: I'll definitely change the last WD disk's LCC timer! ;-D
I'm using the following system:
- Motherboard: Supermicro X9SCM-f-o
- CPU: Intel Xeon 1220Lv2
- RAM: 2x8Go Kingston ECC KVR16E11/8I
- 6x2TB HDD (RAIDZ2)
- FreeNAS version 9.2.1.8
- Using CIFS
I was concerned about the Load Cycle Count (LCC), so I decided to use WDIDEL3 on those 3 disks.
But I was curious about the effect it would have on the numbers coming out therefore I made some tests and thought I could share the results on the forum.
So I have 6 disks: 3 seagate and 3 WD green.
In the results I'll only take one seagate as reference and the 3 WD green.
The first numbers I started with were:
- for the seagate:
Start stop count (SMART id 04): 151
Power on hours (SMART id 09): 13600 hours
Power cycle count (SMART id 12): 61
LCC (SMART id 193): 367
Temperature: 44°C
Power on hours (SMART id 09): 13600 hours
Power cycle count (SMART id 12): 61
LCC (SMART id 193): 367
Temperature: 44°C
- for the WD Green:
Start stop count (SMART id 04): 2
Power on hours (SMART id 09): 29 hours
Power cycle count (SMART id 12): 2
LCC (SMART id 193): 766
Temperature: 41°C
Power on hours (SMART id 09): 29 hours
Power cycle count (SMART id 12): 2
LCC (SMART id 193): 766
Temperature: 41°C
The first thing I did was to cool down the seagate drives! ;-)
(here only one of the seagate is shown but they were around 44-46°C)
I'll have to do something for the WD as well since they are quite close to 40-42°C.
Rather than giving a table full of numbers, I tried to put that in a graph.
The X axis shows the hours between each samples and the Y axis shows the LCC hourly rate.
I had the system running for some hours and got the following results:
- for the seagate, an LCC increase of 0 LCC/hr
- for the WD, an LCC increase of 25/35 LCC/hr (regardless from the APM settings)
First I tried to play around with the Advanced Power Management settings (in the FreenNAS GUI) of each drive (for the WDs).
I set two WD drives with APM at 254, one WD drive with APM at 192 and didn't notice any change in the LCC rate (within 48 hours).
Then I changed the LLC settings on the WD drives (using WDIDLE3).
I kept one drive unchanged (as reference, i.e. at 8s), one disabled and one set at 300s.
I immediately saw the difference:
- the two drives with the LCC timer changed dropped to 0LLC/hr
- the reference WD drive (with the LLC timer at 8s) continued with a rate of 35LCC/hr
Some thoughts:
- I'm surprised that both drives (with LLC timer disabled and LCC timer set at 300s) droped at 0LCC/hr. I would have expect eventually some differences in the numbers...
- I don't explain the drop at around 15LCC/hr (for all the WD drives) when the LCC timer has been changed (see on the graph).
- I don't explain the increase in the LCC rate for the drive with the timer set at 8s (the two last samples show an LCC rate over 55LCC/hr in the last 3 days).
As a conclusion: I'll definitely change the last WD disk's LCC timer! ;-D