[meteorite-list] Spirit's flash memory system problem.

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From: Charles Viau <cviau_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:09 2004
Message-ID: <002501c3e47e$da20f0f0$1800a8c0_at_chupa>

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Wow, talk about some things being the same on earth, as on a spacecraft
on another planet. I just finished watching a NASA brief on C-SPAN
concerning the troubles with Spirit. The current thinking was that since
Spirit has a file system that uses the flash memory, perhaps it cannot
manage the number of files that are being demanded of it.. Now, if the
motor drives on that spectroscope mirror are giving the system problems,
it is going to generate error log messages, that of course.. need the
file system. Thus you have errors that cause errors, compounding on
themselves eg.. a motor drive error (hardware) exposing a file system
discrepancy (software). Very difficult stuff to troubleshoot. just like
a typical hard to find bug in software on Windows and Linux. I had a
disk drive on a Linux system do something similar. the disk was
formatted with a large cluster size so that it had decreased capability
for storing a lot of small files. It ran more efficient, since it was
designed to handle files over 1mb each. Now, the error logger also had
access to this disk, and as luck would have it, we had a memory hardware
failure that started to log a lot of small error log messages on the
disk, until the disk ran out of entry slots for file descriptors., which
in turn generated disk failure messages that masked the real cause of
the problem...
I wonder if the same type of scenario is going on up there..
.

CharlyV

-----Original Message-----
From: meteorite-list-admin_at_meteoritecentral.com
[mailto:meteorite-list-admin_at_meteoritecentral.com] On Behalf Of Michael
Farmer
Sent: Monday, January 26, 2004 8:17 PM
To: meteorite-list_at_meteoritecentral.com
Subject: [meteorite-list] NEW Diogenite

Hello again, I am announcing one of th freshest and most beautiful
Diogenites that I have ever seen. It is almost identical to Johnstown, a
little lighter color.
It is NWA 2081.
Two small stones with a total weight of only 114 grams were found.
The listed pieces are ALL 100% of what is available, the rest was
donated for curation.
Diogenites are quite rare, and this one is beautiful.
http://www.meteoriteguy.com/nwa2081.htm

Thanks
Mike Farmer

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<div class=3DSection1>

Wow, talk about some things being =
the same
on earth, as on a spacecraft on another planet.   I just finished watching a =
NASA
brief on C-SPAN concerning the troubles with Spirit. The current =
thinking was
that since Spirit has a file system that uses the flash memory, perhaps =
it
cannot manage the number of files that are being demanded of =
it….  Now, if the motor drives on =
that
spectroscope mirror are giving the system problems, it is going to =
generate
error log messages, that of course.. need the file system. Thus you have =
errors
that cause errors, compounding on themselves eg.. a motor drive error
(hardware) exposing a file system discrepancy (software). Very difficult =
stuff
to troubleshoot… just like a typical hard to find bug in software =
on
Windows and Linux…  I =
had a
disk drive on a Linux system do something similar… the disk was =
formatted
with a large cluster size so that it had decreased capability for =
storing a lot
of small files. It ran more efficient, since it was designed to handle =
files
over 1mb each. Now, the error logger also had access to this disk, and =
as luck
would have it, we had a memory hardware failure that started to log a =
lot of
small error log messages on the disk, until the disk ran out of entry =
slots for
file descriptors., which in turn generated disk failure messages that =
masked
the real cause of the problem…..<o:p></o:p>

I wonder if the same type of =
scenario is
going on up there….<o:p></o:p>

…<o:p></o:p>=

<o:p> </o:p>

CharlyV<o:p></o:p>=

<o:p> </o:p>

<o:p> </o:p>

-----Original =
Message----- 
From:
meteorite-list-admin_at_meteoritecentral.com
[mailto:meteorite-list-admin_at_meteoritecentral.com] On Behalf Of Michael Farmer 
Sent: =
<st1:date
Month=3D"1" Day=3D"26" Year=3D"2004">Monday, January 26, =
2004</st1:date> <st1:time
Hour=3D"20" Minute=3D"17">8:17 PM</st1:time> 
To:
meteorite-list_at_meteoritecentral.com 
Subject: [meteorite-list] =
NEW
Diogenite

<o:p> </o:p>

<div>

Hello again, I am =
announcing one of
th freshest and most beautiful Diogenites that I have ever seen. It is =
almost
identical to <st1:City><st1:place>Johnstown</st1=
:place></st1:City>, a little
lighter color. <o:p></o:p>

</div>

<div>

It is NWA 2081. =
<o:p></o:p>

</div>

<div>

Two small stones with a =
total weight
of only 114 grams were found. <o:p></o:p>

</div>

<div>

The listed pieces are ALL =
100% of
what is available, the rest was donated for curation. =
<o:p></o:p>

</div>

<div>

Diogenites are quite rare, =
and this
one is beautiful. <o:p></o:p>

</div>

<div>

<a
href=3D"http://www.meteoriteguy.com/nwa2081.htm">http://www.meteoriteguy.=
com/nwa2081.htm</a><o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

Thanks =
<o:p></o:p>

</div>

<div>

Mike =
Farmer<o:p></o:p>

</div>

</div>

</body>

</html>

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Received on Mon 26 Jan 2004 09:39:56 PM PST

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