作者: trentcys 時間: 2008-10-16 16:12 標題: [分享] 企業版同普通桌面HDD o既分別
雖然企業版HDD o既MTBF比普通版高唔少, 但bad sector remapping o既持性唔一樣.
所以用o係single disk/RAID 0 environment o既話有必要考慮埋:
From Synology's wiki:
http://www.synology.com/wiki/ind ... a_Desktop-Class_HDD
Most or all HDDs which are shipped today have defective sectors, or will begin to have defective sectors as the HDD ages. HDDs today have a built-in ability of repairing defective sectors with a backup supply of sectors. This repair process is seamless to the user, and is not required for the user to perform sector remapping manually.
However, given the two aforementioned environments, sector remapping times vary greatly between the two. With a Desktop-class drive, the HDD will attempt to retrieve the data and remap the sector which is damaged, requiring as much time as several minutes. During this sector remapping process, a HDD can time out and become unresponsive to the HDD controller. Because of this, a HDD can be ejected from the controller, as the Controller believes that the HDD is defective as it is unresponsive.
This effort of using several minutes in attempting to retrieve data from a defective sector is essential for single-drive usage, as there is not another copy of the data available. However this behavior is not beneficial in RAID environments, as a drive being ejected from the RAID Controller will result in the Volume becoming degraded, due to a few bad sectors.
To resolve this, sector remapping for Enterprise-class HDD is handled differently. On an Enterprise-class HDD, the HDD will attempt to retrieve the data from the affected sector, however if it cannot be retrieve under a few seconds, the HDD will mark the sector as defective and consider the data lost. The HDD maintains a lower time interval to perform sector remapping thus to avoid timing out or being ejected from the RAID Controller. The HDD will then ask the controller to rebuild the missing data from the other Redundant drives (RAID 1, 5, 6 for example); the rebuilt data from the other drives will then be placed on a backup sector of the HDD. If an Enterprise-Class HDD is used as a single entity, or used in a RAID-0 environment, then the data on the sector which was damaged is considered lost as there are not other redundant mirrors to rebuild the affected data.
In summary, it is not recommended to use Enterprise-class HDDs as a single entity or in a non-redundant RAID environment (JBOD, RAID-0 for example)...
作者: fongsdragon 時間: 2008-10-16 17:55
咁即係話如果只用單硬碟或者raid 0時，都唔應該用企業版硬碟?應該用番家用版?
作者: toni0019 時間: 2008-10-16 19:38
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作者: trentcys 時間: 2008-10-16 21:18
原帖由 fongsdragon 於 2008-10-16 17:55 發表
咁即係話如果只用單硬碟或者raid 0時，都唔應該用企業版硬碟?應該用番家用版?
o既然知道分別, 我會咁建議
作者: trentcys 時間: 2008-10-16 21:19
原帖由 toni0019 於 2008-10-16 19:38 發表
企業版HDD 有五年保係股歡迎的原因
5年保養係...
但對data safety冇幫助呢
作者: HKMichaelKing 時間: 2008-10-16 21:24
HDD 對 Raid Card 兼容都有分別
作者: bmkwong 時間: 2008-10-16 21:31
嘩！原來係咁，仲以為 enterprise class hd 用料好D，用番係 desktop 咪超正。原來不是這樣。
作者: TecraM2V 時間: 2008-10-16 21:38
如果係咁，咁企業級o既 HDD 咪唔可以攞o黎做 STB o既外置 HDD！仲諗住買隻番o黎 7x24 開住o黎用添。
BTW，而家仲有冇 AV 用o既 HDD 賣呀？
作者: rickywk 時間: 2008-10-16 21:41
原帖由 TecraM2V 於 2008-10-16 21:38 發表
如果係咁，咁企業級o既 HDD 咪唔可以攞o黎做 STB o既外置 HDD！仲諗住買隻番o黎 7x24 開住o黎用添。
BTW，而家仲有冇 AV 用o既 HDD 賣呀？
CinemaStar
作者: trentcys 時間: 2008-10-16 22:59
原帖由 bmkwong 於 2008-10-16 21:31 發表
嘩！原來係咁，仲以為 enterprise class hd 用料好D，用番係 desktop 咪超正。原來不是這樣。
1,200,000 hrs壽命我都相信用料好d, 問題係佢設計黎俾redundent RAID用, 所以唔會做retrieve data from bad sector o既動作
作者: fongsdragon 時間: 2008-10-17 00:40
咁老實講，三年保養其實都夠，一般電腦都係用五年到。部腦到第五年都已經變慢速機，upgrade可能仲化算。而且家用版仲平d，哈，等我仲一心諗住之後全買企業版HDD~~~
作者: 風十三 時間: 2008-10-17 00:47
咁我直都應為企業版好啲
原來係錯誤理解
好傷心
作者: fongsdragon 時間: 2008-10-17 00:54
不過其實如果 企業HDD用料好d，有Bad sector機會其實都應該細d掛~~
圍番條數~~~~(係唔行raid既情況下)作者: kelvin2517 時間: 2008-10-17 01:37
等我岩岩先買咗隻企業版tim，不過唯有諗靚料無咁容易壞啦，因為我本來諗住買WD640gb，不過見成日有post話壞咗，所以先買企業版500gb
作者: benjaminlam 時間: 2008-10-17 03:17
那即是話，如果將企業級硬盤用作普通用途上，會較容易出現壞磁區和數據損失？
縱使資料確實，我仍然不想相信。
畢竟掛著「企業級」頭銜，聽起來較高級一點。
看來我整個被「企業級」洗腦了……
作者: jupiters 時間: 2008-10-17 03:19
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作者: Laputa 時間: 2008-10-17 03:45
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作者: trentcys 時間: 2008-10-17 03:45
原帖由 benjaminlam 於 2008-10-17 03:17 發表
那即是話，如果將企業級硬盤用作普通用途上，會較容易出現壞磁區和數據損失？
縱使資料確實，我仍然不想相信。
畢竟掛著「企業級」頭銜，聽起來較高級一點。
看來我整個被「企業級」洗腦了……
唔係, 只係2者處理bad sector o既方法唔一樣.
行RAID 1/5/6 o既話, HDD太耐冇response會俾raid controller當drive failure處理 (要repair array仲大鑊)
所以遇到recover唔返o既bad sector寧願skip, 問同一個array o既其他HDD黎拎data repair仲好.
作者: trentcys 時間: 2008-10-17 03:47
原帖由 Laputa 於 2008-10-17 03:45 發表
咁先高危
一隻咁用果時 一個唔好彩 唔知 邊塊sector 出左事 而佢又唔通知你就自己搞掂左果個 sector
真係仇都無得報 或者 買企業版行raid0
To be fair, even use a normal desktop HDD, there's no guarantee the data in bad sector will be retrieveable... in such case it can just lock up ur system and crash...
作者: Laputa 時間: 2008-10-17 03:50
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作者: nelsonon 時間: 2008-10-17 09:33
而家d hdd咁易有事,真係唔做backup的話,出事真係
都冇用...唉..作者: goodwill 時間: 2008-10-17 09:47
原來係咁,
唔講唔知!
作者: nelsonon 時間: 2008-10-17 10:16
以後係屋企都係用番家用版算數
作者: sigma 時間: 2008-10-17 15:48
原帖由 fongsdragon 於 2008-10-17 00:40 發表
咁老實講，三年保養其實都夠，一般電腦都係用五年到。部腦到第五年都已經變慢速機，upgrade可能仲化算。而且家用版仲平d，哈，等我仲一心諗住之後全買企業版HDD~~~
sure not
3 years ago we have 160G-250G as middle class.
I think it is still useful nowadays....although we may not use it to run OS anymore, we can use to store photo, sw, or BT, FTP, web mail server, etc.
p.s. I still have my 40G and 80G old HDD to BT, used more than 5 years
作者: jackychen 時間: 2008-10-17 16:15
買的時候只考慮保用期. 點會理佢係家用還是企業板.
SERVER 唔係多數行 SCSI 嗎?
作者: av117 時間: 2008-10-17 16:54
咁 Raptor 又點計?
WD 定位Raptor 為 enterprise class，但唔少Home user 用來作System drive，出事時咪好危險?
作者: Travis 時間: 2008-10-17 16:57
我都認為3年保已經夠有餘, 睇返依家硬碟既更新速度, 其實機箱內冇邊隻硬碟係用過3年既...最近既有兩隻320GB, 用左年多小小就退役, 俾兩隻640GB取替....黎緊又諗1TB甚至1.5TB
作者: kirafung 時間: 2008-10-17 20:51
係咪得企業版先係 32mb cache
32mb 同 8mb cache 速度差40mb read 20mb write
P35 chipset
作者: 鬼(?) 時間: 2008-10-17 21:00
咁買高速家用HDD好定買企業版好
(單機作者: belleville 時間: 2008-10-17 21:56
好懷疑 Synology 可唔可以代表所有 hd 廠
企業唔準用 pc? 一定要 server?
用 pc 一定要用 raid? 唔可以單隻 hd??
作者: mclarenfung 時間: 2008-10-17 23:21
WDC>>
主頁 > 企業硬碟 > WD RE3
........
RAID 特有的限時錯誤恢復（TLER） - 防止由廣泛的硬碟錯誤恢復程序引致的後遺症。這種情況常見於桌面硬碟。 ....
....
好似唔係YS 係無...
咁..我信SYNOLOGY 好得WDC 好
唔知S 牌佢有無出 SAN 呢
作者: Travis 時間: 2008-10-18 00:23
原帖由 belleville 於 2008-10-17 21:56 發表
好懷疑 Synology 可唔可以代表所有 hd 廠
企業唔準用 pc? 一定要 server?
用 pc 一定要用 raid? 唔可以單隻 hd??
咁又唔係講到唔用得咁偏激, 係都要用亦都冇話會爆炸, 點解唔得?
作者: trentcys 時間: 2008-10-18 00:49
原帖由 belleville 於 2008-10-17 21:56 發表
好懷疑 Synology 可唔可以代表所有 hd 廠
企業唔準用 pc? 一定要 server?
用 pc 一定要用 raid? 唔可以單隻 hd??
好搞笑lor, 你買過HDD未?!
(SATA) HDD而家產品定位就係分desktop & enterprise 2條line...
冇人話大公司一定要買(對應?)enterprise class HDD, 你自己部PC想用enterprise class亦冇人阻止你
作者: belleville 時間: 2008-10-18 01:04
原帖由 trentcys 於 2008-10-18 00:49 發表
好搞笑lor, 你買過HDD未?!
(SATA) HDD而家產品定位就係分desktop & enterprise 2條line...
冇人話大公司一定要買(對應?)enterprise class HDD, 你自己部PC想用enterprise class亦冇人阻止你
你先搞笑
Synology 有出 hd?? 佢係所有 hd 廠老闆, 佢話 hd 乜乜 = 事實??
enterprise hd 唔係 target 比企業用, 唔通 target 比 c9 用?
作者: GPoker 時間: 2008-10-18 12:07
原帖由 belleville 於 2008-10-18 01:04 發表
你先搞笑
Synology 有出 hd?? 佢係所有 hd 廠老闆, 佢話 hd 乜乜 = 事實??
enterprise hd 唔係 target 比企業用, 唔通 target 比 c9 用?
synology出NAS有raid功能，都要用到hdd來test吧?
再唔係你可以睇下另一間公司intel既分析
http://download.intel.com/suppor ... ss_hard_drives_.pdf
嘛，人地都係測試報告俾人參考下咁解je，要如何選取還是用家選擇吧
作者: mansiu 時間: 2008-10-18 14:21
我有d懷疑, 咁係唔係所有brand 既enterprise/desktop harddisk 都好似synology 咁講先?
個個brand都有咁既分別?
作者: jackykiller 時間: 2008-10-18 14:28
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作者: garymmf 時間: 2008-10-18 15:58
睇完, 都唔覺得用DESTOP HDD 行RAID 0 有咩好處
作者: dannymak 時間: 2008-10-18 16:58
企業硬碟 =better quality and longer warranty
作者: pete 時間: 2008-10-18 18:11
If you have encounter a HD which need over a few minute to recover a single sector of data, what you have to do is to check whether your HD still have warranty and try to claim it.
作者: Travis 時間: 2008-10-18 23:50
原帖由 jackykiller 於 2008-10-18 14:28 發表
我諗到第二樣野
可能佢只係唔想D人太迷信 Enterprise-Class HDD 安全過 普通版HD
驚D人以為用Enterprise-Class HDD行raid 0 and single就冇死
SYNOLOGY 保障自己SYNOLOGY 既利益先講定
有時中文又好英文又好
都唔好淨係睇字面解釋,要諗下背後既潛台詞
即係你死你事
我都諗倒樣野, 以前有d髮型屋賣既洗頭水, 有分電過髮用,染過髮用,一般頭髮用, 最後發現裡面既野原來都係一樣....
作者: nelsonon 時間: 2008-10-19 10:12
原帖由 Travis 於 2008-10-18 23:50 發表
我都諗倒樣野, 以前有d髮型屋賣既洗頭水, 有分電過髮用,染過髮用,一般頭髮用, 最後發現裡面既野原來都係一樣....
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