Am 29.06.2008 um 21:07 schrieb Sorin Srbu: >> -----Original Message----- >>> Actually, the calculation is that it needs a GB of RAM for every >>> TB of > managed data. > > How do you reckon this? Ie, what's the basic assumption(s) for the > statement? > Parity calculations for stripes or what? I don't follow. > > I can't say I've ever heard any such like, so please do enlighten me! > It used to be written in the solarisinternals.com wiki - but I can't seem to find it anymore. ZFS is a moving target, in some ways, so the requirements may have changed or are no longer that simple. But it made sense in the early days, when SUN's thumper (X4500, 2*DC Opteron, 48 disks, 16 GB RAM) more or less fit the requirements perfectly. cheers, Rainer -- Rainer Duffner CISSP, LPI, MCSE rainer at ultra-secure.de