“Our tape drive through put is 300 MB/s when configured it as storage node for other application backups(SAP& LOTUS).”
Why do you state that? – That’s nice for DBs but how does it actually perfom with such file monsters?
Think about ‘the tape drive’s view’:
To work optimally during backups, it just needs data to keep on streaming.
It cannot go faster than the raw data rate allows.
However, if the data rate is lower (most likely for a lot of small files), there are 2 options:
– it can produce a longer gap and keep on streaming, loosing media capacity or
– it can stop and reposition the tape, which takes time (some seconds) and which will decrease the throughput speed even more.
Actually, I don’t know whether the first method does still work with tape drives today (in fact, it was never often used 😉 .
So what can you? – In general you have to test where to improve:
– On the source:
Invest in faster disk systems
(for example in our environment the backup times did reduce by about 60% just when we replaced our VMAX2 with a
VMAX3, backing up to a DD4500).
– On the transport media:
– A 10gBE/SAN should be fast enough
– Maybe you can bundle some channels
– On the backup media:
– Buying more tape drives ? – does not make sense if you already can’t keep a single one streaming.
– Backup-to-disk ? – most likely better to reduce latency
– Backup-to-DDD ? – the best method to benefit if you also use DDBoost
– On the method:
– Zipping before backup – but this needs time and resources aas well
– PSS – needs more backup devices
– BBB – I am not shure thether it can be used along with tape drives (it does not make sense, of course)
– NDMP backups – if you can move the files to an NDMP client
– you may also think wrapping NDMP data using DSA (Data Service Agent)
– SnapImage – I think it is still around but in general it is nothing else as ‘a kind of NDMP backup for Windows filers’
Of course, combinations may also be possible
– First, change to B2D (see above)
– clone from here if you need the data on tape
– Think about the backup method
– Make proper tests and argue with your management to get the best solution for your scenario.
Don’t think about the price – it will pay in the future.