On Apr 21, 13:28, Julian Elischer wrote: } Subject: Re: how to flush out cache.? } } On Wed, 21 Apr 2004, Steve Watt wrote: } } > In article <[EMAIL PROTECTED]> you write: } > > } > >Ok so I have an application where I need to } > >reread a file I have just written to ensure that it went to disk } > >correctly.. } > } > What are you hoping to accomplish? There are probably other ways } > to solve the larger problem. } } I thought I was being clear.. } I need to remove all the pages from cache so that a reread of the file } is forced to go to disk. } and I don't want to go read a 2GB dummy file to force the flush..
No, my question is "what are you trying to accomplish with the reread", at a higher level than "I want to know it's on disk". Is there some reason you have for not trusting the hardware? Are you trying to do a database commit protocol? Debugging the storage system? } Someone suggested that I read the file usign 'dump' through the raw } device.. Even doing that doesn't necessarily mean the bits have made it onto the rotating media. There can also be caches in the disk controller, and/or caches on the drive itself. If you're trying for a case where you want to pull the power, unmounting and remounting the filesystem will get it about as close as you can. -- Steve Watt KD6GGD PP-ASEL-IA ICBM: 121W 56' 57.8" / 37N 20' 14.9" Internet: steve @ Watt.COM Whois: SW32 Free time? There's no such thing. It just comes in varying prices... _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
