> I'll give you another failure point that most people never see or think of. > > I used to manage numerous Linux systems with RAID-5. One time I had a drive > fail, the spare kicked in, and then during the rebuild a 2nd drive > failed...hosing the RAID (i.e. two failed disks). > > The problem was...normal disk access/backup only scanned the in-use blocks. > The RAID resync scanned the entire disk which had never been done. > > After that I put in a utility that did a nightly "dd if=/dev/md0 >/dev/null" > job to force a scan of the entire disk set. > > This is one reason why they invented RAID6. > > There's just so many ways to fail...sigh...
Off topic but an interesting read for disk failures: http://blogs.sun.com/relling/entry/raid_recommendations_space_vs_mttdl -- Matthew Jones Hewlett-Packard Ltd Long Down Avenue Stoke Gifford Bristol. BS34 8QZ Tel: +44 (0) 117 312 7490 Email: matthew.jo...@hp.com<mailto:matthew.jo...@hp.com> Hewlett-Packard Limited registered Office: Cain Road, Bracknell, Berks, RG12 1HN. Registered No: 690597 England The contents of this message and any attachments to it are confidential and may be legally privileged. If you have received this message in error, you should delete it from your system immediately and advise the sender. To any recipient of this message within HP, unless otherwise stated you should consider this message and attachments as "HP CONFIDENTIAL". _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
