Dne 18.12.2015 v 21:50 Ian Pilcher napsal(a):
On 12/18/2015 12:51 PM, Alasdair G Kergon wrote:
Did you try stacking LVM on top of itself first?
Honestly, no (although my initial testing of zodcache actually used
logical volumes as the origin and cache devices FWIW).
This exercise is as much about the "optics" as it is about the actual
technical merits of the solution. The goal is provide something that
(at least on the surface) looks "simple".
With just a couple of obvious enhancements to the mkzc utility (clear
the metadata region and start the new device), creating a cached device
would literally take just a single command.
Sure - as long as you do not need to solve any 'security/safety' points,
you can do things in a simple way.
But how do you plan to support any power-failures and recoveries ?
When someone pick drive to other system - what is going to happen ?
Are you going to write your own 'lvm2-like' tools to do the job ?
Are you going to maintain this over long time period ?
You really should have started from RFE on lvm2 enhancements to better suite
your needs - since IMHO there are no SIMPLE things when we talk about devices...
Regards
Zdenek
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