Archived posting to the Leica Users Group, 2008/08/22

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Subject: [Leica] RAID controllers?
From: photo at (Nathan Wajsman)
Date: Fri Aug 22 23:10:49 2008
References: <> <>

This whole thread has been quite interesting, as I have considered a  
neater approach to external disks than the JBOD approach I use now.  
So, going back to basics. I understand what Raid 0, 1, 5 mean. What I  
would like is a Raid 1 or 5 solution with as much capacity as  
possible, at a reasonable price, and able to work with my iMac (in  
other words, no possibility for a Raid controller card, it must be  
able to plug into one of the FW or USB ports and be controlled by  
software). Does such a thing exist, or am I better off staying with  


Nathan Wajsman
Alicante, Spain


On Aug 22, 2008, at 11:06 PM, George Hartzell wrote:

> Gary Todoroff writes:
>> Very thoughtful and informative reply, George. Would love to debate
>> over a beer sometime! [...]
> I think that it wouldn't be much of a debate, at the end of the day
> we're pretty much in agreement.  Over the years we've all learned all
> kinds of lessons about organizing our data on computers.  A lot of
> what I've internalized isn't really appropriate anymore (multi core
> systems with fast internal buses make it more reasonable to do
> software raid, terabyte drives mean that I no longer have to glue
> storage together out of too-small peices, although fast & large file
> size cameras have me generating more data than ever) but there are new
> reasons for slicing and dicing.
> I was reacting to the idea of not putting the OS on a raid for
> stability reasons, and I still think that's not an issue.  Your
> comment
>> [...] data only on
>> the RAID, OS on the IDE (or is it SATA?) drive that runs the computer
>> and will be there no matter what happens to the RAID.
> still makes it seem that you don't see the RAID devices as a source of
> stability, but we can just agree to differ on that.
>> I also like the
>> performance advantage that puts the OS overhead on one disk, while
>> the data read/writes are the only function of the RAID.
> One of the nice things about putting everything on the mirror is that
> it gives the OS a chance to interleave and nearly-optimally schedule
> IO requests onto both of the drives, you get 2x read speeds while
> reading in LightRoom for the first time, then 2x read speeds while
> reading in your images, then if necessary app and image reading in
> parallel.
> But anyway, it's been a fun discssion,
> g.
> _______________________________________________
> Leica Users Group.
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Replies: Reply from hartzell at (George Hartzell) ([Leica] RAID controllers?)
Reply from meino at (Meino de Graaf) ([Leica] RAID controllers?)
In reply to: Message from datamaster at (Gary Todoroff) ([Leica] RAID controllers?)
Message from hartzell at (George Hartzell) ([Leica] RAID controllers?)