mirroring over networking

[Apollon Koutlides]

> > Kai sto s/w RAID den einai toso diaforetika... to rebuild ginetai sto
> > background, aytomata (rebuild status/progress : cat /dev/md0)
> 
> /proc/mdstat mipos?

Safws kai nai! :-] ma poy exw to myalo moy?

> > Fysika, to s/w RAID exei kai to sobarotato pleonekthma oti mporei na
> > ylopoih8ei me fthnoys ATA-* diskoys (Redundant Array Of Inexpensive
> > Disks my a$$ me ta SCSIa).
> 
> exactly, an kai ta dontia tou ta deixnei sta scsia, oxi tipota allo, alla
> sta scsia mporoun na doulevoun kai 2 diskoi taftoxrona, kai na sindeseis
> pano apo 3 diskous (ennoeitai oti an valeis kai ta 2 kanalia na paizoun,
> einai a-pe-xto gia tsampa.)

Correct me if I'm wrong, alla aposo exw katalabei otan exeis ena disko
maximum per ATA channel exeis concurrent transfers. Fysika anebainei
ligo to controller cost per disk, alla mexri 4 diskoys p.x. (xwris CDROM)
eisai arketa anetos... 2 channels apo ton onboard kai 2 apo ena PCI
ATA-100 einai arketa f8hna. Kai h diafora kostoys me ta SCSIs einai
POLY sobarh (gia improved availability sto katw katw bale kai 1 hot
spare, h ama eisai TOSO availability-paranoid 2 hot sparez).

> An epitrepetai, ti arxeia grafontai sini8os sto array sou (se mege8os
> enoo) kai poso exeis valei to  chunk size?
> 

Average: 643KB / Min: 321B / Max: 48.3MB

chunk-size 32
(den asxolh8hka idiaitera[1] me to chunksize optimization)

[1] #define idiaitera ka8oloy

> Vagelis Papadogiannakis
> http://www.wise.gr
> papas at wise.gr
> 


Apollon Koutlides
http://apollon.d2g.com