>> On Mon, 9 Jun 2008 23:31:35 +0200 (CEST), >> Wojciech Puchar <[EMAIL PROTECTED]> said:
W> but why you need [a filesystem for linux that do checksum on the fly]?! all W> PATA/SATA drives do checksumming on every read. in hardware, no CPU load. These days, hardware isn't just hardware. A disk drive can have around 300,000 lines of low-level firmware, and who wants to bet that it's completely bug-free? Silent-write errors are actually a big problem: http://www.usenix.org/publications/login/2008-06/openpdfs/bairavasundaram.pdf An Analysis of Data Corruption in the Storage Stack "In this paper, we present the first large-scale study of data corruption. We analyze corruption instances recorded in production storage systems containing a total of 1.53 million disk drives, over a period of 41 months. We study three classes of corruption: checksum mismatches, identity discrepancies, and parity inconsistencies. We focus on checksum mismatches since they occur the most; more than 400,000 instances of checksum mismatches over the 41-month period." -- Karl Vogel I don't speak for the USAF or my company Mangled song lyric: Looks like tomatoes Actual lyric: Looks like we made it. (Barry Mannilow) _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"