Chuck Swiger wrote: > Joseph Koshy wrote: > >>> what I want is: >>> >>> int fd = open("myfile",...); >>> write1GBfiletodisk(fd, data); >>> ioctl(fd, PURGEFROMCACHE); >>> perform_md5(fd); >>> >>> and be sure that teh MD5 is that of what is on the disk. >>> not what is in RAM. >> >> >> unmount(file-system-of("myfile")) (even if it fails) ? > > > That's actually a pretty good suggestion, and is less intrusive than, > say rebooting, which is probably the only way to be entirely sure that > the write cache on the drive itself has been flushed. If the write > cache is off, Julian probably ought to be able to trust fsync(2)...? Wouldn't there be a way to take the code that does the cache dumping (excuse my bad lingo here) and make a little tool that does it without any actual unmounting? Suppose the filesystem actually unmounted.. yikes! Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology I have seen the future and it is just like the present, only longer. ------------------------------------------------------------------------Received on Thu Feb 17 2005 - 20:19:03 UTC
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