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2TB WD20EARS HCL Advanced Format 4k Sectors TLER LCC WDidle3
EDIT: This thread was written before the Readynas group had recognized and addressed the WD Advanced Format HDD's. An issue that remains to this day is the massive LCC(Load Cycle Count) increases due ...
@emonkia ... Very Nice speed.
Mine is not .... 20,656 vs 212,202 ..... That is 1/10 or should I say 10% the speed of yours ... Im saying it looks to be down to the HDD's Only so its the WD..EARS vs WD VelociRaptor...... and 4KB cluster straddling 2 physical sectors.... i.e. 4KB Alignment problem.
Just To Make It Easier On The Eyes To Compare.
Please Read this article about the new "Advanced Format" 4KB Block sector / cluster Overlap / mis-aligned Data.
In a nutshell, it’s replacing the traditional 512 byte hard drive sector with a 4 kilobyte (4,096B) hard drive sector for a number of practical and technological reasons.
http://www.anandtech.com/show/2888 ... Read from the start to finish and you will understand how this will eventually effect everyone and all brands as HDD sizes grow past 2TB.
There are benefits such as better error correction not to mention the size increase..
Mine is not .... 20,656 vs 212,202 ..... That is 1/10 or should I say 10% the speed of yours ... Im saying it looks to be down to the HDD's Only so its the WD..EARS vs WD VelociRaptor...... and 4KB cluster straddling 2 physical sectors.... i.e. 4KB Alignment problem.
Just To Make It Easier On The Eyes To Compare.
Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
WD20EARS 2G 760 88 20656 4 17189 4 734 55 147995 26 218.3 3
WD3000HLFS 8G 302 99 212202 71 107321 26 1302 99 277330 34 942.3 24
Latency **Note Milli Seconds vs Micro Seconds**
WD20EARS 9958us 2174ms 1951ms 1518**ms** 101**ms** 100ms
WD3000HLFS 29253us 152ms 145ms 18990**us** 41966**us** 394ms
files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
WD20EARS 256 239 99 302797 99 21390 19 259 99 314931 99 325 49
WD3000HLFS 256 25163 74 253426 99 19293 48 28168 81 325141 99 8949 23
Latency **Note Milli Seconds vs Micro Seconds**
WD20EARS 406ms 664us 432**us** 444ms 60us 4932ms
WD3000HLFS 177ms 887us 369**ms** 120ms 75us 1072ms
Please Read this article about the new "Advanced Format" 4KB Block sector / cluster Overlap / mis-aligned Data.
In a nutshell, it’s replacing the traditional 512 byte hard drive sector with a 4 kilobyte (4,096B) hard drive sector for a number of practical and technological reasons.
http://www.anandtech.com/show/2888 ... Read from the start to finish and you will understand how this will eventually effect everyone and all brands as HDD sizes grow past 2TB.
There are benefits such as better error correction not to mention the size increase..
This will most likely be addressed under Yoh-Dah's areas of Firmware updates not by c3po's.
c3po wrote: (Shortened quote) Hi MrCyberdude,
To address the complaints on HDD:
(1) The regulatory and safety tests are lengthy, because of this, WDC tends to change hardware and firmware without changing product model name and model number(Very bad practice) - We have been caught by this many times.
The very latest one is 4KB physical sector. Somehow, ReadyNAS is not 4KB aligned(We take part of blame on this because we should have used 4KB boundary).
Because of this, each write will split into two writes (WDC has to read/modify/write with correct ECC to half updated physical sector),
write performance hit is over 50% because of this. New release will of course address this problem
(2) Disk test. We have integrated disk test into boot menu for a while now. To access boot menu, please follow the user manual (I am not sure if this is actually documented for each product, but I am sure you can get answer for each ReadyNAS on forum)
(3) Rather than this 4K performance issue, and above disk test, I don't see any other case that we can blame HDD for performance issue
Best regards, c3po
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