On 11-Nov-07, at 10:19 AM, can you guess? wrote: >> >> On 9-Nov-07, at 2:45 AM, can you guess? wrote: > > ... > >>> This suggests that in a ZFS-style installation >> without a hardware >>> RAID controller they would have experienced at >> worst a bit error >>> about every 10^14 bits or 12 TB >> >> >> And how about FAULTS? >> hw/firmware/cable/controller/ram/... > > If you had read either the CERN study or what I already said about > it, you would have realized that it included the effects of such > faults.
...and ZFS is the only prophylactic available. > > ... > >>> but I had a box that was randomly >>>> corrupting blocks during >>>> DMA. The errors showed up when doing a ZFS scrub >> and >>>> I caught the >>>> problem in time. >>> >>> Yup - that's exactly the kind of error that ZFS and >> WAFL do a >>> perhaps uniquely good job of catching. >> >> WAFL can't catch all: It's distantly isolated from >> the CPU end. > > WAFL will catch everything that ZFS catches, including the kind of > DMA error described above: it contains validating information > outside the data blocks just as ZFS does. Explain how it can do that, when it is isolated from the application by several layers including the network? --Toby > > ... > >>> CERN was using relatively cheap disks >> >> Don't forget every other component in the chain. > > I didn't, and they didn't: read the study. > > ... > >>> Your position is similar to that of an audiophile >> enthused about a >>> measurable but marginal increase in music quality >> and trying to >>> convince the hoi polloi that no other system will >> do: while other >>> audiophiles may agree with you, most people just >> won't consider it >>> important - and in fact won't even be able to >> distinguish it at all. >> >> Data integrity *is* important. > > You clearly need to spend a lot more time trying to understand what > you've read before responding to it. > > - bill > > > This message posted from opensolaris.org > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
