Re: ZFS dedup si compression

Valentin Cozma <[email protected]>
Newsgroups gmane.org.user-groups.rlug.general
Message-ID <[email protected]>
salut,
eram la capitolul teste.
ce am simtit deocamdata e ca rata de transfer a scazut f. tare .
nu ma deranjeaza neaparat cei 5 GB / 1 TB de la dedup cat ma deranjeaza
viteza f. slaba. 
poate ma insel nu prea am timp sa fac o analiza f. detaliata .
o sa mai testez doar cu compresie, poate scaderea de viteza e de la
compresie desi procesorul nu sare de 30% ..
10x
On Mon, 2016-11-14 at 11:44 +0200, Alex 'CAVE' Cernat wrote:
> compresia e bunicica, deci da-i inainte cu tupeu (presupunand ca nu
> ai
> pus gzip9 sau mai stiu eu ce traznaie); daca ai pus un lz4, aproape
> nici
> ca se simte
> si felicitari pentru curajul de a pune dedup; pe cat de mult am dat
> din
> coada cand am auzit prima data de acest feature, pe atat mi-a venit
> sa
> vars cand am vazut imaginea globala; mai pe scurt, uite ce zic altii:
> 
> For every TB of pool data, you should expect 5 GB of dedup table
> data,
> assuming an average block size of 64K.
> This means you should plan for at least 20GB of system RAM per TB of
> pool data, if you want to keep the dedup table in RAM, plus any extra
> memory for other metadata, plus an extra GB for the OS.
> 
> si partea mai nashpa ca nici cu un ssd pe post de l2arc lucrurile nu
> devin mai bune
> 
> in concluzie, vorba lui caragiale, deduplicarea e minunata, e
> sublima,
> nu lipseste cu desavarsire, dar sa fie la dusmani :-P
> 
> Alex
> 
> On 14/11/2016 10:53 AM, Valentin Cozma wrote:
> > 
> > salut,
> > 
> > credeti ca merita sa continui cu dedup si compression ?
> > 
> >  zdb -b storage
> > 
> > Traversing all blocks to verify nothing leaked ...
> > 
> > 	No leaks (block sum matches space maps exactly)
> > 
> > 	bp count:          595567
> > 	bp logical:    34523237376      avg:  57967
> > 	bp physical:   26776677888      avg:  44959     compression:   
> > 1.29
> > 	bp allocated:  28329140224      avg:  47566     compression:   
> > 1.22
> > 	bp deduped:    1905303552    ref>1:  48278   deduplication:   1
> > .07
> > 	SPA allocated: 26423836672     used:  5.30%
> > 
> > 
> > mersi !
> > 
> > 
> > 
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-- 

 

	   Valentin Cozma	 CEO & Founder	 m:	 +40730096543	 a:	 Bd Burebista Nr 1 Bl D15 Ap 25 Bucuresti	 w:	 www.deversoft.ro  e: [email protected] 	       
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