Unexpected soft update inconsistency
peter.schuller at infidyne.com
Mon Jan 19 15:31:11 PST 2004
What's the deal with soft updates and guaranteed consistency? Every time
journaling is brought up by someone, he/she is promptly told about how soft
updates does the job at least as well. I never had a problem with this based
on what I have read about soft updates. However:
I *very* quickly ran into a case where I got an "unexpected soft update
inconsistency" after crashing the machine by doing something naughty with
Vinum while there was disk activity (note: the filesystem which exhibited the
problem was not on a vinum volume).
So my question is:
Do soft updates, or do they not, algorithmically guarantee filesystem
meta-data consistency in the event of a crash?
or to put it another way:
Was this an implementation bug or a fact of life with soft updates?
/ Peter Schuller, InfiDyne Technologies HB
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