W. Chris Shank on Tue, 28 May 2002 12:13:00 -0400


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Re: [PLUG] Linux Raid


so there is no way of doing this to increase your write speed?

> On Tue, May 28, 2002 at 08:54:51AM -0600, W. Chris Shank wrote:
>> ok, so i was right - but spelled wrong (unless your into that sort of
>> thing:^)? and because you are writing to 2 disks (half data to each),
>> you increase your effective data writing throughput - right?  
> 
> Actually, when you stripe data in a RAID configuration, you increase
> your throughput for reading and decrease your total throughput for
> writing.  You have two drives working in parallel to read, so it goes
> faster.  With writing, you have to wait for both drives to move the
> heads and turn the platters to the correct position, then you have to
> wait for the confirmation.  With reading, the drives just send you data
> as fast as they can get it and the OS (if it's software) or the RAID
> card (if it's hardware) puts the bits into the correct order.
> 
> -- 
> Bill Jonas    *    bill@billjonas.com    *    http://www.billjonas.com/
> "They that can give up  essential  liberty to obtain a little temporary
> safety deserve neither liberty nor safety."        -- Benjamin Franklin



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