Edward Shishkin wrote: > Matthias Andree wrote: > >> On Tue, 01 Aug 2006, Hans Reiser wrote: >> >> >>> You will want to try our compression plugin, it has an ecc for every >>> 64k.... >> >> >> >> What kind of forward error correction would that be, > > > > Actually we use checksums, not ECC. If checksum is wrong, then run > fsck - it will remove the whole disk cluster, that represent 64K of > data.
How about we switch to ecc, which would help with bit rot not sector loss? > > > and how much and > >> what failure patterns can it correct? URL suffices. >> > > Checksum is checked before unsafe decompression (when trying to > decompress incorrect data can lead to fatal things). It can be > broken because of many reasons. The main one is tree corruption > (for example, when disk cluster became incomplete - ECC can not > help here). Perhaps such checksumming is also useful for other > things, I didnt classify the patterns.. > > Edward. > >
