[Nottingham] LVM and load balancing and ReiserFS

[Martin]

Duncan John Fyfe wrote:
[---]
> 
> What are you trying to achieve ?

Thanks for the very good summaries. Time to think up a working scenario.

I've great prejudice against RAID for the increased latency and the mess
if it goes wrong. If you're wanting a warm fuzzy feeling of resilience
for your data, I much prefer using rsync/mirroring onto an independent
system backed up with good backups all round.


So... I have a large (1 TB +) ever expanding chunk of frequently
accessed data that can't easily be divided up.

So, being as it's got to go across multiple disks, I'd like to have some
flexibility to swap in/out disks as the data grows further, and also
gain some IO performance. All without needing to completely rewrite the
whole lot onto new disks for each upgrade.


One option might be LVM with linear addressing *IF* ReiserFS does (or
can be configured to) spread the data evenly-ish across the full
physical storage space.

Does ReiserFS optimise to use HDD cylinders to minimise head movements?
If so, will ReiserFS still pick that up from LVM?...


Or is LVM clever about striping if you then add another one or two HDDs?


Or any better ideas?

Regards,
Martin

-- 
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Martin Lomas
martin at ml1.co.uk
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