Hmm interesting. This could be the case as the system was powered down for
about 4 hours while some power work was done.
Maybe the problem was in the CF itself? I used Emphase SLC in this instance.
I will have to monitor this. Thanks all.
Regards
Michael Knill
On 03/08/2013, at 11:12 AM, The Cadillac Kid <[email protected]> wrote:
>
> this very thing has been a mystery to me all along.. I think sometimes it
> has to do with the internal caching of the storage device itself.. ive
> definitely seen it with USB thumb drives.. the "light" will flicker went
> making a write.. however ive seen data cached and never written to the
> media.. im not sure if some of these devices employ an amount of RAM in them
> as a buffer. . a "speed buffer" and perhaps they occasionally fail to write
> out the complete buffer.. thus causing data loss at power fail..
>
> typing 'sync' only flushes data from Linux's own buffers.. I dont know of a
> way other than I think hdparm -F /dev/hda (insert your own block device) to
> tell the storage device itself to flush its buffers.. my disclaimer is that
> hdparm commands are definitely dangerous.. no I personally have never
> destroyed a disk with hdparm.. but its generally considered gutsy to use
> it...
> -Christopher
> From: Lonnie Abelbeck <[email protected]>
> To: AstLinux Users Mailing List <[email protected]>
> Sent: Friday, August 2, 2013 5:55 PM
> Subject: Re: [Astlinux-users] Really weird problem
>
> Michael,
>
> I have never seen that in my 1000's of AstLinux reboots, but granted I try
> not to "pull the plug" either. :-)
>
> Possibly (no doubt) typing "sync" from the command line after you finished
> making changes would have made the difference.
>
> Another thing to consider during persistent storage setup (setup.php) is
> whether to place your /mnt/kd/ on unionfs (ASTURW) or as a separate native
> ext2 partition. Personally I've always been a fan of using a separate
> partition with a belief there is less overhead then via unionfs. Possibly
> unionfs caches the writes more than a native /mnt/kd/ partition would ?
>
> I did a quick test and my HDD light flickers every time I do a "Save
> Settings" from the web interface.
>
> Though I find it odd that you made several changes and none of them made it
> to persistent media.
>
> Lonnie
>
>
>
> On Aug 2, 2013, at 3:06 PM, Michael Knill wrote:
>
> > No one has any ideas? Its got me really worried.
> >
> > Regards
> > Michael Knill
> >
> >
> >
> >
> > On 01/08/2013, at 3:56 PM, Michael Knill
> > <[email protected]> wrote:
> >
> >> To the group
> >>
> >> I had a really weird problem which is bugging me and I am hoping someone
> >> can explain.
> >>
> >> I set up a new system at a site, left it for about 3 weeks, then went back
> >> and finished off the configuration.
> >> The site had a power failure and when it came back, all my config changes
> >> FROM MY SECOND VISIT had disappeared.
> >>
> >> How could this happen? I have NO IDEA!
> >>
> >> Regards
> >> Michael Knill
>
>
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