I'm also interested in hearing people's opinions about LVM / EVMS.
With LVM it will be possible for you to have several raid5 and raid6:
eg: 5 HHDs (raid6), 5HDDs (raid6) and 4 HDDs (raid5). Here you would
have 14 HDDs and five of them being extra - for safety/redundancy
purposes.
that's a very high price to pay.
partition on top of them. Without LVM you will end up with raid6 on
14 HDDs thus having only 2 drives used for redundancy. Quite risky
IMHO.
your risk model is quite strange - 5/14 redundancy means that either
you expect a LOT of failures, or you put a huge premium on availability.
the latter is odd because normally, HA people go for replication of
more components, not just controllers (ie, whole servers).
It is quite often that a *whole* IO controller dies and takes all 4
you appear to be using very flakey IO controllers. are you specifically
talking about very cheap ones, or in hostile environments?
drives with it. So when you connect your drives, always make sure
that you are totally safe if any of your IO conrollers dies (taking
IO controllers are not a common failure mode, in my experience.
when it happens, it usually indicates an environmental problem
(heat, bad power, bad hotplug, etc).
Question to other people here - what is the maximum partition size
that ext3 can handle, am I correct it 4 TB ?
8 TB. people who want to push this are probably using ext4 already.
And to go above 4 TB we need to use ext4dev, right?
or patches (which have been around and even in some production use
for a long while.)
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