[Lustre-discuss] Regarding redundancy

[Christopher Deneen]

A quick note on my setup, 40 oss's each with a md0 raid1 (The OST)
(2x500gb) (amd x2 5400 8gb ddr2)   and a single mdt/mgs/mds (dual xeon
quad core 32gb ddr2 4tb raid6). I have everything mounted and working
properly and am still going through the basic tests for performance
but I am confused about the safety of the cluster. I not concerned
about the OST's because they are a raid 1 which I can recover quickly
and monitor but my question is, what if an OSS goes down. Will that
cause corruption of the data? and what happens if it comes back up. I
also would like to know if you can dynamically add to the cluster new
OSS/OST's or do you have to unmount the client then remount after
doing so.
Thanks for your help in advance.