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Re: [dm-devel] Re: ANNOUNCE: mdadm 3.0 - A tool for managing Soft RAID under Linux



Hi all,
 
As a user of both dm (in lvm) and md, I am not reassured by the "turf war" flavor coming from the dm side. The idea that all functions should be glooped together in one monster program, whether dm or the Microsoft operating system, is not an automatic + in my opinion. The massive patch activity that I see in dm-devel could be an indication of function overcentralization leading to design risk, just as in Microsoft development.
 
A minor technical note follows.
 
For things like suspend/resume of incoming IO (so a device can be
reconfigured), maybe.  I recently added that so that I could effect
raid5->raid6 conversions.
 
Suspend is not necessary, only barriers, as long as you define a hybrid raid5/raid6 array via a moving watermark. Only those IOs that hit in the neighborhood of the watermark are affected.

Larry Dickson

Cutting Edge Networked Storage
 

 
NeilBrown

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