Re: [ADSM-L] Seeking wisdom on dedupe..filepool file size client compression and reclaims
2009-08-29 19:59:07
>> On Sat, 29 Aug 2009 09:24:11 +0200, Stefan Folkerts <stefan.folkerts AT ITAA
>> DOT NL> said:
> Now I am thinking, dedupe only occurs when you move data the volumes
> or reclaim them but 10G volumes might not get reclaimed for a LONG
> time since they contain so little data the chance of that getting
> reclaimed and thus deduplicated is relatively smaller than that
> happening on a 100G volume.
I think that, to a first approximation, the size of the volume is
irrelevant to the issues you're discussing here.
Do a gedankenexperiment: Split 100TB into 100G vols, and into 10 10G
vols. Then randomly expire data from them.
What you'll have is a bunch of volumes ranging from (say) 0% to 49%
reclaimable. You will reclaim your _first_ volume a skewtch sooner in
the 10G case. But on the average, you'll reclaim 500G of space in
about the same number of days. Or said differently: in a week you'll
reclaim about the same amount of space in each case.
I need to publish a simulator.
So pick volume sizes that avoid being silly in any direction.
- Allen S. Rout
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- Re: [ADSM-L] Seeking wisdom on dedupe..filepool file size client compression and reclaims,
Allen S. Rout <=
- Re: [ADSM-L] Seeking wisdom on dedupe..filepool file size client compression and reclaims, Stefan Folkerts
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