by Beaten Rice » Mon Dec 21, 2009 8:18 am
Depends on the RAID config, some will support the loss of only 1 drive, others can support the loss of 2.
Generally if you have less than 5 drives then loss of two and you have lost all the data, if 5 or more drives then you can generaly recover from the loss of two.
Some systems even have a hot spare drive so that if a failure occurs, it switches the failed drives function to the hot spare immediately.
If you unplug raid drives and re-plug them in a different order, this will also screw the data.
System would slow up with the loss of any drives.
Basically as soon as you get a failure - replace the drive and pray it rebuilds before another failure occurs, you may want to replace it at close of business because the sytem will be slow while the RAID rebuilds itself.