今日買咗 2 隻 WD15EARS 比 NAS, 希望生生性性

本帖最後由 GbE 於 2010-5-1 02:40 編輯

之前用 Seagate 7200.12 500G ( Mirror ), 行 SMB, iSCSI, BT ....
今日研究成朝, target 買 1.5T Seagate (LP / 7200.12) or WD (AFD), 見 QNAP 話 support AFD, 其實都想試新嘢, 心大心細, 又驚有 write performance 問題.

跟據呢度 C 兄講

Seagate : LP 冇 RAMP load/unload 冇呢誠意
WD : AFD 4KB / sector, 有可能唔夾

出到 SSP, 原來 1.5T 冇 7200.12 . 好 ! 唔使煩, 就 AFD
希望生生性性, 冇鑊冇幹

Mirror 中, 好慢 ( 我知係 Green )

另外為免此 post 移去吹水區, 唯有跟份 Tech Doc 啦, 呢篇嘢我覺得寫得好好, 睇完會明好多 AFD, align 做乜 (同 SSD 都要 align 一樣), 裏面引伸好多 point, 512byte sector 應要革新 la

http://hothardware.com/printarticle.aspx?articleid=1466

樓主咁NAS入面點用新果隻4/KB sector 黎format?

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QNAP firmware 已  support, 只不過唔可以用 live capcity expand/migrate. 要 copy 走 data, 再由頭 init hd, 再 copy back data.

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回復 1# GbE

i think now the biggest problem on wd hard disk is the load cycle count...

i also got a 1TB eads (your one is ears, which support afd and newer) and used in my nas, it die after nine months and i take it back to xander, they replace another 1TB ears (same as your series) to me.    but i am not sure ears will have the same problem or not..

i think qnap should also able to show the s.m.a.r.t. attributes of the hard disk, try to monitor it....  or u can google the "load cycle count", u will find that the load cycle count attribute is having a limit.... shoud be around 100000~300000. don't think this number seems very large.., this attribute increase very fast on my dead 1TB and i believe the death of 1TB is casued from that..

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回復  GbE

i think now the biggest problem on wd hard disk is the load cycle count...

i also ...
a_tung 發表於 2010-5-1 11:57


you mean on green series or all series??

I am using Qnap 419P with 2 x 1.5tb EARS and 2 x 1tb EARS...so far so good....

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本帖最後由 GbE 於 2010-5-1 15:48 編輯

回復 4# a_tung

I have read this issue b4, some C-Hing have post a utility "wdidle3" to change the idle timer, I still haven't apply it, but I will keep Mon. SMART and checking, thanks

http://www.synology.com/support/ ... ng=enu&q_id=407
http://www.xlr8yourmac.com/tips/Disable_WDGreen_HeadParking.htm

In QNAP Support Web, they already address EADS have problem

http://www.qnap.com/cht/pro_compatibility.asp

WD WD20EADS 2000 Note8
WD WD15EADS-00R6B0 1500 Note8, 9
WD WD10EADS-00R6B0 1000 Note8

Not Recommended Hard Drives
WD WD15EADS-00P8B0 1500 Slow Performance
WD WD10EADS-00P8B0 1000 Slow Performance

Note8
For improved stability, please update your NAS firmware to v3.1.2 Build1001 or later. There is known performance issue with WD15EADS-00P8B0 and WD10EADS-00P8B0. These two HDDs are not suggested to use with QNAP NAS.

Note9
For NMP-1000, please click here to download the HDD compatibility update.


For my understanding, this is not WD problem, this is all GREEN HD ( include other band ) will suffer. The issue is when HD's idle timer reach, the HD will PARK the head, but some System will wake-up the HD again. So as result the counter will increase much. After the counter reach the limit, the SMART will be fail and some system may warn or disconnect the HD. But in fact, those HD still work normal.
For my QNAP, I set HD turn-off in 15min, so I think if I set HD-idle time longer than 15min or just disable it, then I will not suffer this issue.

Pls correct me if I am wrong.

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you mean on green series or all series??

I am using Qnap 419P with 2 x 1.5tb EARS and 2 x 1tb EAR ...
Yanek 發表於 2010-5-1 13:20


should be only have problem on green series... since i have a 640G blue that haven't any problem. by the way, u can check it out by the s.m.a.r.t. attribute on your nas.

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Green 都係唔好用o係NAS 好...

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回復 6# GbE

thank you for your information.

beside that, i have some experience about my dead wd green hard disk and i want to share it with u and guys here.

the story is like that,... there is one day when i at home, and i try to access some files from my nas, i think u also know that, the nas will become hibernate and need to take some time to wake up.  i wait for the login box appear (the time is longer than normal cirsumstance and i think the nas is waking up so need some time....) and at this moment, i still don't know that my hard disk has problem, around 20 second, the login box appear and i can login without problem. when i try to copy a cd  iso file (less than 500MB)  to my pc, my pc pop up the status bar and estimate the requred time........ the time is increase..... increase..... and increase......

suddenly, i heard some continous beep sound. then i check it out and found that the status light of my nas is changed to blinking amber and continously beep. i try to login to my nas, it' ok without problem and it tell me that my hard disk has problem and the nas is automatic changed to read only mode...

back to the previous process of copying an 500MB iso file, it is started.. the speed is really slow (less than 5MB/s)... i spend some time to back up of my files and then buy another hard disk (hitachi 2TB) to restore them .....

sfter i settle down my nas, i take the dead wd disk out and connect to pc sata port, it can be detected rather than recognize... what i mean is, my pc can detect something like a hard disk is connected by can't recognize  it's capacity. then i take it out, connect the dead wd disk to usb to sata cable, it detected a mass storage device then stopped...... i try to use my hand to feel is the disk is spinning or not, the answer is yes but in a very slow speed.....

at last, as i mentioned in previous before, i took the dead wd to xander to replace another one..... and this is the end of the story....

i hope u won't face this situation like me, if so, don't try to shut down or restart the nas. because after i shutdown the nas then try to power it on (i hope it will become normal), the nas is unable to recognize the hard disk anymore..... of course, if i don't try to backup my data in the read only mode, all my files will lost..... luckily, all files can be backed up.

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