Some interesting results: copy of 500MB file 'time cp file file.new' ext3, -d1 -c1 -m16 -u1 -W1 real 1m42.435s user 0m0.220s sys 0m17.740s ext3, -d1 -c1 -m16 -u0 -W0 real 2m24.970s user 0m0.210s sys 0m18.780s ext3, -d1 -c1 -m16 -u0 -W1 real 1m52.677s user 0m0.290s sys 0m17.950s So basically my question is; do I loose all benefits of ext3 if I turn on the hard disk write cache? /Martin
Hi, On Wed, Nov 14, 2001 at 11:49:06AM +0100, Martin Eriksson wrote:> So basically my question is; do I loose all benefits of ext3 if I turn on > the hard disk write cache?You lose the guarantees, yes. I've been talking with Andre Hedrik about the possibility of doing cache forcing on ide, but even then, disks lie about when the data is completely on disk, so it's not clear just how much you lose by having the write caching turned on. Cheers, Stephen