Re: raid1 and raid 10 always writes all data to all disks?

[Bill Davidsen <davidsen@tmr.com>]

Keld Jørn Simonsen wrote:
> On Sun, Feb 03, 2008 at 10:56:01AM -0500, Bill Davidsen wrote:
>   
>> Keld Jørn Simonsen wrote:
>>     
>>> I found a sentence in the HOWTO:
>>>
>>> "raid1 and raid 10 always writes all data to all disks"
>>>
>>> I think this is wrong for raid10.
>>>
>>> eg
>>>
>>> a raid10,f2 of 4 disks only writes to two of the disks -
>>> not all 4 disks. Is that true?
>>>  
>>>       
>> I suspect that really should have read "all mirror copies," in the 
>> raid10 case.
>>     
>
> OK, I changed the text to:
>
> raid1 always writes all data to all disks.
>   

Just to be really pedantic, you might say "devices" instead of disks, 
since many or most arrays are on partitions. Otherwise I like this, it's 
much clearer.
> raid10 always writes all data to the number of copies that the raid holds.
> For example on a raid10,f2 or raid10,o2 of 6 disks, the data will only
> be written 2 times.
>
> Best regards
> Keld
>
>   


-- 
Bill Davidsen <davidsen@tmr.com>
  "Woe unto the statesman who makes war without a reason that will still
  be valid when the war is over..." Otto von Bismark 



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