On Tuesday 02 September 2003 10:11, John Haxby wrote: > Price Technology wrote: > >I had posted a while back asking about writing data immediately to a > > removable drive, and SYNC was indeed the answer. Thanks to whomever it > > was that jogged my brain on that one. > > > >My question now is a two parter; > > > >1. Is there a setting that will cause the sync operation to happen > >automatically at every disk write without me having to enter the command > > each time ?? > > Only at the application level. You can use fsync() or open the file > O_DIRECT when you write files. > Acknowledged. I recalled (or thought I did) something from my earlier readings, but the dust has settled since then and I had forgotten it. > >2. Am I cutting my own throat by doing such a thing ?? (ie would it cause > >performance problems, increase the chance of data corruption, that sort of > >thing) > > Performance will suck. Big time. I mean really really suck. A > write will take thousands of times longer to complete. Especially if > this is a slow removable disk. It will be slow. Your disk will die > of physical exhaustion. Well, maybe not that one, but it will be painful. > Not good I am thinking. I had a hunch that was the case. > To be honest, not everything is finally commited to disk and the disk > marked clean until you unmount it. Before you remove any removable > device you need to unmount it and then everything gets written back to > the disk. Right. That's what I was seeing which prompted the earlier post. (a few weeks ago now) Anyway, thanks again for the input. I'll stick to using SYNC when I'm in a hurry and leave well enough alone elsewise. Joebewan -- Shrike-list mailing list Shrike-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/shrike-list
