mirroring over networking

[Papadogiannakis Vagelis]

"Apollon Koutlides" <apollon at market.d2g.com> wrote:

> > kai prostheteis enan allo kainourio sti thesi tou kai kanei to 
> > replication o controller kai allo einai na paideyesai me software RAID
> > ktl ktl.
> 
> Kai sto s/w RAID den einai toso diaforetika... to rebuild ginetai sto
> background, aytomata (rebuild status/progress : cat /dev/md0)

/proc/mdstat mipos?

> 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.)

> Edw kai 3 mhnes trexw s/w RAID 5 (apo s/w RAID 1 epi 4 mhnes prin) se
> (not so heavy) production environment kai anamfibola 8a hmoyn pseyths 
> an elega oti exw opoiodhpote parapono. Mporei na mhn einai hot-
> pluggable oi diskoi, alla to systhma trexei me psofio disko (se 
> degraded mode fysika, ektos an exeis hot spare opote karfaki poy
> toy kahke) arkei na exeis mono ena disko per channel. (O slave diskos
> 8a arnh8ei na synergastei an de doyleyei o master, you can't have it
> all)

raid level 5 se production sistima(ta), doulevoun tzami, pote prob den
eixame.
Mporei na argei ligo perisotero sta writes (~20%) , alla sigoura einai pio
asfales, kai sta reads skizei :)

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

> Fysika, milaw gia local RAID kai se kammia periptwsh RAID over network
> (diestrammeno moy akoygetai... mallon 8a to dokimasw syntoma! :)
> 
> >  To LVM den to exo dei katholou opote den mporo na eikfero gnomi gia
> to 
> > olo thema.
> 
> Same here. ;)
> 
> >  Filika
> >   Stamatis
> 
> A'flakia
> 
> Apollon Koutlides


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