[DRBD-user] Large block IO bottleneck

Leroy van Logchem leroy.vanlogchem at wldelft.nl
Thu Jan 4 09:58:10 CET 2007


>>>> Hi there I am using DRBD 0.7.21 with iSCSI Enterprise
>>>>         
> The 32k are a rather arbitrary value we have chosen in DRBD. Such a limit
> is needed for some of the algorithms in the area of the two primary
> nodes, write conflict detection code.
>
> If you really want you can change that define (HT_SHIFT), but probably
> the positive effects are out-numbered by negative effects (more collision
> in hash tables etc...)
>   
I was hoping to analyse the difference by patching the source but the 
HT_SHIFT define
is only used in the 8.x code. What would need changing to try 32K BIO's 
in the 0.7.x code?



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