Archive for the ‘Mystery’ Category

Exchange Server messages disappearence

Posted: 1st April 2010 by as in Blogroll, Mystery, Operating Systems, Windows
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Another story from the mystery category. A Microsoft Small Business Server has been moved from one premises to another twice in the last two weeks. The first time the server was moved and the users confirmed that the server is up and running and all the services working fine. The main service of the server [...]

hash functions on md RAID-6: part three

Posted: 1st April 2010 by as in Blogroll, Linux, Mystery, Operating Systems
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In the original configuration the RAID-6 over the 6 disks was build using two different SATA controllers. Four disks were connected to RocketRAID and the other two connected to the integrated Intel SATA.
Now, the motherboard has changed to  a new one with 6 SATA connections via the integrated controller. However, it caused tat the CPU [...]

hash functions on md RAID-6: part two

Posted: 27th March 2010 by as in Blogroll, Linux, Mystery, Operating Systems
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A new kernel was installed and every package on the system was recompiled…
So, here is another attempt. All the files are scp’ed to the second computer onto the RAID-6. And again, there is inconsistency. Tho hashes were calculated OK, all the other FAILED.

hash functions on md RAID-6: part one

Posted: 26th March 2010 by as in Blogroll, Linux, Mystery, Operating Systems
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I stumbled across a very unusual problem. I have one computer with a number of big files from 1Gb to 10 Gb. The files are dd images of some disk partitions. md5sum, sha1sum and sha256sum hashes are