西数桌上型硬盘(between Desktop edition)无法完全支持RAID功能？

nono.tang

到西数官网查了一下，发现如下：
     http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faqid=1397&p_created=1131638613&p_sid=GfosOxIj&p_accessibility=0&p_redirect=&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9Mjc4LDI3OCZwX3Byb2RzPSZwX2NhdHM9JnBfcHY9JnBfY3Y9JnBfcGFnZT0xJnBfc2VhcmNoX3RleHQ9YmV0d2VlbiBEZXNrdG9wIGVkaXRpb24!&p_li=&p_topview=1

Question
	What is the difference between Desktop edition and RAID (Enterprise) edition hard drives?
	Answer
	Western Digital manufactures desktop edition hard drives and RAID Edition hard drives. Each type of hard drive is designed to work specifically in either a desktop computer environment or a demanding enterprise environment. If you install and use a desktop edition hard drive connected to a RAID controller, the drive may not work correctly unless jointly qualified by an enterprise OEM. This is caused by the normal error recovery procedure that a desktop edition hard drive uses. When an error is found on a desktop edition hard drive, the drive will enter into a deep recovery cycle to attempt to repair the error, recover the data from the problematic area, and then reallocate a dedicated area to replace the problematic area. This process can take up to 2 minutes depending on the severity of the issue. Most RAID controllers allow a very short amount of time for a hard drive to recover from an error. If a hard drive takes too long to complete this process, the drive will be dropped from the RAID array. Most RAID controllers allow from 7 to 15 seconds for error recovery before dropping a hard drive from an array. Western Digital does not recommend installing desktop edition hard drives in an enterprise environment (on a RAID controller). Western Digital RAID edition hard drives have a feature called TLER (Time Limited Error Recovery) which stops the hard drive from entering into a deep recovery cycle. The hard drive will only spend 7 seconds to attempt to recover. This means that the hard drive will not be dropped from a RAID array. Though TLER is designed for RAID environments, it is fully compatible and will not be detrimental when used in non-RAID environments.

英文不怎么好，大致意思是：
WD(Western Digital)桌上型硬盘(between Desktop edition)无法完全支持RAID功能，与deep recovery cycle 有关; 仅有企业型硬盘( RAID (Enterprise) edition ) 可于RAID模式下运作，与TLER (Time Limited Error Recovery) 有关。

lotuis

LZ没有看到这句的？
If you install and use a desktop edition hard drive connected to a RAID controller, the drive may not work correctly unless jointly qualified by an enterprise OEM.
字面意思大概是 只要RAID Controller支持的话那就没问题，如果RAID Controller不支持，那就不支持。

nono.tang

ls，may not work的意思不是"可能无法正常工作"?

lotuis

3# nono.tang


the drive may not work correctly unless jointly qualified by an enterprise OEM.
这后面不是还有限定吗……除非……

nono.tang

那个限定的意思是除非获得他们的企业oem.....不知道这个词引申是什么意思

lotuis

5# nono.tang


我怎么觉得是说Raid Controller呢……
好像用普通WD桌面硬盘做Raid的人也大有人在吧……

nono.tang

根据上述意思是,如果用桌面级硬盘做raid,发生错误时,硬盘将进入deep recovery cycle ,大部分的raid控制器可以很快的恢复,但如果此时出现时间很久,则硬盘驱动器将主动丢弃raid阵列.
而企业级硬盘加入TLER (Time Limited Error Recovery),字面意思应该是限时恢复错误,所以杜绝了上述问题

lotuis

根据上述意思是,如果用桌面级硬盘做raid,发生错误时,硬盘将进入deep recovery cycle ,大部分的raid控制器可以很快的恢复,但如果此时出现时间很久,则硬盘驱动器将主动丢弃raid阵列.
而企业级硬盘加入TLER (Time Limi ...
nono.tang 发表于 2009-9-22 10:48

你的这个翻译有点让人郁闷……

当桌面级硬盘出现错误时，硬盘会进入深度修复周期并尝试去修复错误，恢复故障区域的数据，然后重新分配一块专用区域用来取代先前的故障区域。这个过程耗费的时间取决于问题的严重性，最多将花费2分钟时间。大多数的Raid控制器所允许的硬盘恢复时间比较短，如果一块硬盘花费太长的时间去完成这个修复过程，这块硬盘将会被Raid控制器强制下线。 大多数RAID控制器只允许错误恢复占用7到15秒的时间，如果超出时间限制Raid控制器将会强制将该硬盘离线。

西数企业级硬盘具有限时恢复的特性，这个特性可以阻止硬盘进入深度修复周期。硬盘将只花费7秒的时间去尝试修复.这就意味着故障硬盘将不会被Raid控制器强制离线。尽管限时修复是专门为Raid环境设计的，在非Raid环境下使用也完全没有问题。

看到了吧……不是桌面硬盘不能用，只是桌面硬盘在出现错误之类的问题的时候，可能会因为自己的修复模式而导致被Raid控制器踢出来……

nono.tang

哦,明白
只是风险性更大了,不是不能用

ff0759

学习了，这么看来组RAID 0还是用企业级硬盘比较好，不然一点错误导致被踢整个RAID就完了。搞几块企业级绿盘还是有必要的。