Hello Heinrich,Gabriel,
Sunday, February 22, 2004, 5:00:27 PM, you wrote:
Why that? I can imagine that i lose data in case of a power failure, but why in case of a crash?
Well I guess the card COULD still commit the data, however, who knows if it actually does it?
And why is write cache only dangerous with softupdates, as you wrote above?
IIRC softupdates relies on the assumption that when the softupdate changes return, they really ARE on the disk. It's the same with most RDBMS: because they go to great lengths to ensure the journal is in an ok state they need to know for sure that the data they wrote to it actually made it to disk.
Since i found no word about disabling write cache in the FreeBSD handbook or in man tuning(7), i would really like to know, if this is just a rumour, or where does it come from?
I can't say for sure, but I have little confidence in write caching anyhow. It changes semantics the system relies on, for one.
Best regards, Gabriel
what you write does make sense, although i really can't understand why this important info is not in the FreeBSD documentation.
I have disabled write cache, but i will keep softupdates disabled as well for now, and see how the system behaves.
Thanks for your help,
Heinrich
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