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| Linux Forum Index » Linux Development » FOLLOWUP -- Re: Mysterious server lockups with Ubuntu... |
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| Ignoramus3863... |
 Posted: Sun Aug 31, 2008 12:06 pm |
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If you recall, I was asking what I can do with a important production
server that would lock up every few days, sometimes even more
often. It was running Ubuntu hardy 64 bit. I tried a few things, HPET
disable, nohz, you name it. Nothing helped. It was running 2.6.24.
My readings on this matter suggested that 2.6.24 is not that great
kernel, that Fedora chose 2.6.25 for a reason, etc, so I decided to try
the kernel route.
So, I finally tried one more thing, which is to download 2.6.25 from
kernel.org, compile it and use it without any special flags like
hpet=disable and so on. Just a standard compile, standard install,
no extra arguments, etc.
After that, with 2.4.25, it's been 13 days, the server is up, and does
not seem to crash (knock on wood). It is not yet conclusive, so I will
keep an eye on it.
i |
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| Matt... |
| Posted: Tue Sep 02, 2008 6:19 am |
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Ignoramus3863 wrote:
Quote: often. It was running Ubuntu hardy 64 bit. I tried a few things, HPET
disable, nohz, you name it. Nothing helped. It was running 2.6.24.
I didn't see you mention previously that it was 64 bit. |
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| Jean-David Beyer... |
| Posted: Fri Sep 05, 2008 11:06 am |
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The Natural Philosopher wrote:
Quote: Worse still, it may be like teh one that I had..it only corrupted two
bytes of something loaded off a floppy..now consider that somewhere
within a CD-ROM loaded kernel, two bytes are wrong..
I do not think that is likely, though it is not impossible. I use Red Hat
Enterprise Linux, and the CD-ROM images are checksummed. I verify the
checksum before I burn them to CD-ROMs. Then when I install from CD-ROMs,
the install program does its own checksum of the disks to ensure that they
are OK. So those things have survived two checksum tests. The first one is
MD5. I do not know what the install program uses. RPM files are signed and
the signature contains a checksum, so once an RPM file is read into the
machine, its signature can be checked before it is written to disk. Another
safeguard.
But if, at the last minute, the disk surface is of marginal quality, the
disk controller could write out something on the disk that was stored
incorrectly. I am unaware of disk controllers that read back every block
after writing it and compare it with what is stored in memory. (My tape
drive does that, but that is another story.) So if the controller writes
something that is recorded on a defective spot on disk, so it reads back
correctly sometimes, but not all the time, too bad.
I have never noticed problems like this on my new machines, but I am glad I
do not write real-time control software for an Intensive Care Unit in a
hospital. And I imagine the patients are glad too.
--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 11:50:01 up 29 days, 17:56, 4 users, load average: 4.27, 4.40, 4.39 |
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