What happens when the physical volume of an OST is irrecoverably lost? What data is lost? Only the data stored on this OST, or everything? And, if the first is true, how can one control what data is stored on which OST? Assuming that clients see a single combined filesystem.
We have some data on very old DDS (1,2 and 3) DAT tapes. I tried reading them with:
dd if=/dev/st0 of=file bs=32k
but get many partial blocks and sometimes IO errors. Have also tried with:
dd if=/dev/st0 of=file bs=32k conv=noerror
which does not stop at partial blocks but does sometimes give IO errors. Some of these tapes contain tar archives but most of them contain a bunch of FITS files. What would be the best way to rescue as much data as possible from these tapes?