On Sun, 17 Jan 1999, Christian Kuhtz wrote: > > Hey gang: > > Somebody mentioned the other day that UFS async isn't entirely async, and > that directories are (always) sync. Is that true?
not afaik. > Can somebody elaborate on why that is? normal UFS mounts are async in respect to data, however meta-data/directory-ops are done sync so that your filesystem doesn't resemble the aftermath of "squril VS 18-wheeler" in the case of a power outage/crash you CAN mount UFS totally async, but then if you incorrectly shutdown your box prepare to recreate the filesystem (*) in 3.0 you have the option of 'softupdates' if you qualify for the license, look in the /usr/src/contrib/sys/softupdates/README for an explanation. softupdates allow for safe async because writes to the meta-data are ordered in a failsafe manner. -Alfred (*) i used to mount async for builds and compiling at times a while back, i never had massive destruction, but you never know, i suspect renaming your /usr and hitting the reset button would be considered fatal if timed properly > > Cheers, > Chris > > -- > "We are not bound by any concept, we are just bound to make any concept > work > better than others." -- Dr. Ferry Porsche > > [Disclaimer: I speak for myself and my views are my own and not in any way to > be construed as the views of BellSouth Corporation. ] > > To Unsubscribe: send mail to majord...@freebsd.org > with "unsubscribe freebsd-current" in the body of the message > To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-current" in the body of the message
