Alvin Oga wrote: > hi ya raiders .. > > we(they) have 14x 72GB scsi disks config'd as raid5, > ( no hot spare .. ) > > - if 1 disk dies, no problem ... ez to recover right. if one dies raid does exactly what is's supposed to do... > - my dumb question is, > - if 2 disks dies at the same time, i if 2 disks fail at the same time you data is lost. if you have raid5 with 5 hot spares and a second disk dies, befor a hot spare is synced into the array (will be listed as spare until sync hast finished) the same - data gone. > - i think 4x 300GB ide disks is better ( less likely to fail ?? ) it's a simple calculation. if one disk fails with a risk of 1 to 100000, then 10 disks fail with 10 to 100000. which means that having 10 disks is two times as dangerous as having 5 disks. if i had an array with as much disks as you have i would chose raid level 6 (not sure if dm supports this by now). raid level 6 survives two disks failing at once. btw: what reason is there to switch off air conditioning of your it equipment. temperature changes are poison to this fragile things. greetings, frank
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