We have an old HP DL380 G3 with 6x36GB Ultra320 SCSI drives in a RAID 10 array. We monitor the drives carefully as they are old - the SMART pre-failure indications all said OK. Then 4 days later, 2 drives had failed (in fact the drives may not have physically failed but there is corrupt data on 2 drives). How can this happen? I'm not a great believer in co-incidences and chance.
A single drive failure I can believe, but multiple failures leads me to believe there's something more going on. I have heard that the SCSI backplane on the DL380 can fail - can anyone confirm this from experience? Should we replace the SCSI backplane? Should we replace all the drives when we rebuild the array?
Edit: I have looked into some stats we had recorded recently on the accumulated run hours on the drives in this array. The 2 drives that failed had 0.6 and 2.7 run-years on them. This seems to me to discount the theory that the drives simply deteriorated at exactly the same rate and therefore failed very close together. Unless the accumulated run hours data is no more trustworthy than SMART?