On 01/24/2013 02:39 PM, Edward Ned Harvey (openindiana) wrote: > > Based on my extensive work benchmarking zfs systems, I can say this: The > default write performance on a plain old sas/sata card (without SSD) is > horrible by comparison to the following alternatives: > > You get a huge increase if you add the HBA write buffer. > You get better still (by just a little) if you disable the HBA write buffer > (go back to the plain old SATA card) and add a SSD log device instead. > You get the best performance (of course) if you eliminate both the HBA write > buffer and SSD log device, while also disabling ZIL. But this configuration > is only "safe" for certain types of usage.
Just a quick question and I think I know the answer: you mean *sync* write performance, right? Otherwise none of those above matter and the HBA should act as just a fat pipe from RAM to disks. Cheers, -- Saso _______________________________________________ OpenIndiana-discuss mailing list [email protected] http://openindiana.org/mailman/listinfo/openindiana-discuss
