[nylug-talk] Recommendations for encrypted tape drive(s)?

[Steven Lembark]

>>  >    Just out of curiosity I wanted to know how long it would take
to back up
>>  > the 30 TB number that Peter mentioned (with a single device):
>>  >
>>  >     Rate        Time
>>  > ---------------------------
>>  >    240 MB/s   36.4 hours
>>  >    160 MB/s   54.6 hours
>>  >    120 MB/s   72.8 hours

Bad assumption: that you can stream the tape. In a
normal time-sharing environment (unless you feel
like booting with bash as init) you could easily
double numbers based on streaming rates.

>>
>>  >
>>  >    So if an LTO4 is the fastest drive available and a company
wants to do a
>>  > full backup every 24 hours (most probably don't but some do), then
it seems
>>  > like a lot more than a single tape device is required.
>>
>>  Does anyone do full backups on "large" systems daily to tape? I've
>>  never seen it managed any other way except perhaps a copy to
>>  annother disk system (eg. databases dumps to disk) followed by full
>>  dumps and incrimentals afterwards).

With things like billing data you eventually
have to, even on EMC's. Monthly images with
daily/weekly incrementals are the most common
thing I've seen.

In most cases you end up with parallel-streaming
software like veritas that labels and dumps the
blocks to multiple tapes in order to keep the
whole process streaming. Just don't loose the
backup database or the entire backup set is
junk :-)


-- 
Steven Lembark                                            85-09 90th St.
Workhorse Computing                                 Woodhaven, NY, 11421
lembark at wrkhors.com                                      +1 888 359 3508