Messages in this thread | | | Date | Tue, 30 Sep 1997 11:56:05 -0500 (EST) | From | "Mark H. Wood" <> | Subject | Re: safe file systems |
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On Fri, 26 Sep 1997, Harald Milz wrote:
> Steven N. Hirsch (shirsch@ibm.net) wrote: > > > > At work we use JFS on IBM RS/6k boxes and Advfs on Digital Unix. AFAIK, > > they are highly tolerant of the abuse you describe. > > Not necessarily. Open files are truncated to zero length on power loss or > RESET. Only the meta data is handled in a transaction oriented manner to > make sure the filesystem is consistent.
If you want to make sure you lose nothing, you need to write a serial transaction stream to tape and not commit a transaction until this I/O completes, like the banks do. But now we're getting a bit above the file system level. Maybe you are asking too much of the file system; maybe instead you need to overlay it with a transaction monitor.
Mark H. Wood, Lead System Programmer MWOOD@INDYVAX.IUPUI.EDU Those who will not learn from history are doomed to reimplement it.
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