Eyal Traitel etraitel@yahoo.com writes: [...]
- Crash recovery - filer's fsck (wack) is much much faster than other
vendors' solutions - >~600GB/hr and more.
The point about "wack" is that you will probably never have to run it. The checkpoints keep the filing system self-consistent, even if you have the unusual experience of losing the NVRAM contents after a power failure.
This is probably just as well, as my memories of "wack" are that it was infuriatingly slow! But that was several years ago (FASware 2.x) and on an FAServer 450. I think I came to the conclusion that the main problem was that it was reading the directories in a random order rather than optimising head movement.
"wack" isn't in the regular filer command set. These days it is hidden behind "rc_toggle_basic"; if I remember correctly, in 1995 it was "22/7" that was the magic word one had to use!
Chris Thompson University of Cambridge Computing Service, Email: cet1@ucs.cam.ac.uk New Museums Site, Cambridge CB2 3QG, Phone: +44 1223 334715 United Kingdom.