Bas schrieb:
>
> > >
> > > Hi all,
> > >
> > > I'm setting up a new server, basically it's RedHat 7.2 XFS with all
> > > updates from RedHat applied. Kernel is 2.4.9-31SGI_XFS_1.0.2. I have two
> > > IDE disks with software RAID1 partitions for /, /boot, /home. Nothing
> > > special.
> > >
> > > The problem I have is that after some installation and configuration
> > > work, some xinetd config files in /etc/xinetd.d became 0 byte size. IIRC
> > > I saw the same thing some time ago with another machine but I really
> > > don't understand what's going on. BTW, I didn't have a crash or unclean
> > > shutdown.
> > >
> > > [root@gw-linux-dev xinetd.d]# ll /etc/xinetd.d
> > > total 44
> > > -rw-r--r-- 1 root root 295 Mar 18 15:53 chargen
> > > -rw-r--r-- 1 root root 315 Mar 18 15:53 chargen-udp
> > > -rw-r--r-- 1 root root 295 Mar 18 15:53 daytime
> > > -rw-r--r-- 1 root root 315 Mar 18 15:53 daytime-udp
> > > -rw-r--r-- 1 root root 287 Mar 18 15:53 echo
> > > -rw-r--r-- 1 root root 306 Mar 18 15:53 echo-udp
> > > -rw-r--r-- 1 root root 317 Mar 18 15:53 finger
> > > -rw-r--r-- 1 root root 491 Mar 18 15:53 jftpgw-inet
> > > -rw-r--r-- 1 root root 257 Mar 18 15:53 ntalk
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 rexec
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 rlogin
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 rsh
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 rsync
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 talk
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 telnet
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 time
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 time-udp
> > > -rw-r--r-- 1 root root 0 Mar 18 15:53 wu-ftpd
> > >
> > > I have then restored the empty files from another installation.
> > > Everything seemed okay. I have then rebooted and now it's getting more
> > > interesting.
> > >
> > > [root@gw-linux-dev xinetd.d]# ll
> > > total 36
> > > -rw-r--r-- 1 root root 295 Mar 18 15:59 chargen
> > > -rw-r--r-- 1 root root 315 Mar 18 15:59 chargen-udp
> > > -rw-r--r-- 1 root root 295 Mar 18 15:59 daytime
> > > -rw-r--r-- 1 root root 315 Mar 18 15:59 daytime-udp
> > > -rw-r--r-- 1 root root 287 Mar 18 15:59 echo
> > > -rw-r--r-- 1 root root 306 Mar 18 15:59 echo-udp
> > > -rw-r--r-- 1 root root 317 Mar 18 15:59 finger
> > > -rw-r--r-- 1 root root 491 Mar 18 15:59 jftpgw-inet
> > > -rw-r--r-- 1 root root 257 Mar 18 15:59 ntalk
> > > -rw-r--r-- 1 root root 359 Mar 18 15:59 rexec
> > > -rw-r--r-- 1 root root 376 Mar 18 15:59 rlogin
> > > -rw-r--r-- 1 root root 428 Mar 18 15:59 rsh
> > > -rw-r--r-- 1 root root 317 Mar 18 15:59 rsync
> > > -rw-r--r-- 1 root root 245 Mar 18 15:59 talk
> > > -rw-r--r-- 1 root root 303 Mar 18 15:59 telnet
> > > -rw-r--r-- 1 root root 319 Mar 18 15:59 time
> > > -rw-r--r-- 1 root root 315 Mar 18 15:59 time-udp
> > > -rw-r--r-- 1 root root 361 Mar 18 15:59 wu-ftpd
> > >
> > > It looks okay, but then I tried this:
> > > [root@gw-linux-dev xinetd.d]# cat rsh
> > > [root@gw-linux-dev xinetd.d]#
> > >
> > > Further investigation shows that the same files that were missing before
> > > are now filled with zero. After restarting xinetd, I guess they will be
> > > 0 bytes in size.
> > >
> > > I have searched RedHat bugzilla but didn't find anything useful.
> > > What comes to mind is the problem with zero filled bytes after a crash
> > > but I didnt' have any crash or unclean shutdowns. It seems to be
> > > something similar anyway.
> > >
> > > Is it possible that xinetd performs an operation on the files which
> > > leaves them not cleanly flushed to disk when shutting down?
> > >
> > > Thanks for any help!
> > >
> > > -Simon
> >
> > I reproduced it now:
> > Using ntsysv to manage services -> reboot: Files in /etc/xinetd.d have
> > normal size but filled with zero. Using ntsysv again truncates them to
> > zero size. Maybe write cache on the disks is enabled for some reason.
> > That could explain why changes are not commited to disk. I don't
> > understand it anyway because on reboot, the cache should be flushed to
> > disk, doesn't it? The hole thing lets me feel quite bad because I'm
> > wondering what else has been lost.
> >
> > Can anybody confirm similar problems?
> >
> > -Simon
>
> Yep, something similar here. It happened to me in 2.4.17 (and before).
> If I use vi to edit a file and reboot the machine shortly after (without
> properly shutting down),
> the files are filled with nothing but it seems to have it's normal size.
Okay, that's absolutely normal with XFS if you don't properly shutting
down. My point is that I do properly shutdown and I get zeroed files
anyway!
-Simon
>
> Thanks,
> Bas.
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