Replikace / redundance na dvou serverech

[Petr Bezděk]

Miroslav Lachman napsal(a):
> Divacky Roman wrote:
>>
>>docela zajimavy nastroj je ggate - pripojeni fyzickeho disku pres sit. je to
>>rychle, jednoduche... proste fajn :)
> 
> 
> A jak to pracuje? Koukal jsem do manualu ggated, ggatec, ggatel, ale
> prijde mi to az moc strucne popsane. A uz vubec si z toho nedokazu
> predstavit, jak ma fungovat to, co popisuje v nasledujicim mailu Martin
> Hudec.
> 
> Pole bude Demon PA-8U4p-R
> http://www.axus.com.tw/Ultra320%202U%208%20bays%20PATA.htm udajne ma dva
> SCSI konektory, ale jestli to pujde pripojit ke dvoum strojum zaroven,
> to teda netusim.

Ggate je dobra vec, ale podle me jen na read-only pristup, pripadne jen 
s jednim RW pristupem k danemu zarizeni. Nebo aspon podle toho, co pise 
Pawel Jakub Dawidek:

...more than one consumer with RW access isn't a good idea (think of it 
as of any other disk device opened for write by more than one consumer, 
GEOM doesn't allow this by default, because it is just evil, there are 
no synchronization and there can't be any, because from disk device 
perspective we know nothing about file system on it, etc.).

S cim jsem se neprimo setkal a umi to, co od toho ocekavate, tj. primy 
pristup k jednomu diskovemu poli z vice uzlu, je CXFS od SGI. Na FreeBSD 
to ale nebezi a cena take nebude mala.

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Petr Bezděk