On Jun 28, 2007, at 12:24 PM, Avy Wong wrote:
Hello Guru(s),When it comes to data compression on the client side, is it true that when the data sent to tape drives it will be compressed again? are all tape drives for data compression default set to yes? How can I find that out? ...
Avy - Compression is governed by your Devclass settings. You can typically verify that compression is set via OS queries; for example, in AIX one can do like 'lsattr -El rmt0'. The compression algorithms in tape drive hardware are usually the best, and though will attempt compression per your settings, the data will not expand as in some host software compression algorithms. Client-side compression is often not used, because it so taxes the client; but this has to be balanced against network loading, the other major factor. Richard Sims
