Re: High-Precision NFS Timestamps

2011-01-13 Thread Harlan Stenn
Eric wrote: > As I said, we do use NTP to keep our machines in synchronization, every > hour. ... If you are doing something other than running ntpd as a daemon, you are likely not keeping your clocks sync's well enough to keep NFS timestamps happy. H

Re: High-Precision NFS Timestamps

2011-01-13 Thread Eric Reischer
As I said, we do use NTP to keep our machines in synchronization, every hour. However, there's no time client that will keep everything aligned up to the nanosecond level, which is what ext4 timestamps are in. Besides, any amount of network lag is going to introduce small errors in this anywa

Re: High-Precision NFS Timestamps

2011-01-12 Thread Miles Bader
Bob Friesenhahn writes: > Usually the solution to this is to install and run ntp (Network Time > Protocol, as offered by 'xntp') on the machines on your network. Is that really a solution? Running ntp makes it a lot more _likely_ that machines will appear to be synchronized to a high degree of p

Re: High-Precision NFS Timestamps

2011-01-12 Thread Bob Friesenhahn
On Wed, 12 Jan 2011, Eric Reischer wrote: I recently upgraded our NFS fileserver to an ext4 filesystem, and since then we've been having clock skew warnings from make (3.81). Because the ext3 filesystem that was previously running on the NFS server didn't support high-precision timestamps, we

Re: High-Precision NFS Timestamps

2011-01-12 Thread Eric Blake
[adding bug-make, replies can drop automake] On 01/12/2011 03:08 PM, Eric Reischer wrote: > I recently upgraded our NFS fileserver to an ext4 filesystem, and since > then we've been having clock skew warnings from make (3.81). Because > the ext3 filesystem that was previously running on the NFS s

High-Precision NFS Timestamps

2011-01-12 Thread Eric Reischer
I recently upgraded our NFS fileserver to an ext4 filesystem, and since then we've been having clock skew warnings from make (3.81). Because the ext3 filesystem that was previously running on the NFS server didn't support high-precision timestamps, we didn't have clock skew warnings because an