On Wed, 21 May 2008 14:29:49 -0400 Theodore Tso [off-list ref] wrote:

On Wed, May 21, 2008 at 11:03:24AM -0700, Andrew Morton wrote:

quoted

afaik there is no need to enable this feature if the machine (actually
the disks) are on a UPS, yes?

Yes, as long as you're confident that there won't be a kernel
bug/regression causing a lockup while the server is under severe
memory pressure while doing lots of fsync's, file creations, renames,
etc.

That won't cause corruption, will it?  The problem is purely one of
"data which the disk acked didn't make it to platter"?

 And as long as your 100% confident that UPS's will never fail,
janitors will never accidentally hit the Emergency Power Office
switch, and so on.

Well.  The product of two very small numbers is...