Archived posting to the Leica Users Group, 2008/08/23

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Subject: [Leica] RAID controllers?
From: meino at (Meino de Graaf)
Date: Sat Aug 23 10:59:31 2008
References: <> <> <>


have a look at

they also exist for firewire


Nathan Wajsman wrote:
> 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 JBOD?
> Nathan
> Nathan Wajsman
> Alicante, Spain
> Books:
> Blog:
> 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.
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Replies: Reply from photo at (Nathan Wajsman) ([Leica] RAID controllers?)
In reply to: Message from datamaster at (Gary Todoroff) ([Leica] RAID controllers?)
Message from hartzell at (George Hartzell) ([Leica] RAID controllers?)
Message from photo at (Nathan Wajsman) ([Leica] RAID controllers?)