Ivan Petrovich wrote:
My claim was based on experience of running a test configuration once, and observing an 8-hr run time, then after turning off software compression, observing that the time was reduced in half. I immediately abandoned software compression.
Are you suggesting that once Amanda has run once (for 8 hrs, using gzip both in "estimate" and "dump"), it should not need to run gzip for the estimate phase ever again, and will therefore only take the "normal" amount of time (4 hrs, using gzip only for "dump") to run?
Software compression is never done in the estimate phase, not even the first one.
The very first estimate gets multiplied by the "comprate" factor (see amanda.conf). The next ones are from the accumulated history of the real dumps. (See "amadmin ConFig info host /disk")
About slow estimates: gnutar can be slow if there are lots of small files in the DLE during estimate. dump in all variants (ufsdump etc) needs only a fraction of time for these filesystems. Suggestions have been made (and maybe being experimented/implemented) to allow for less accurate but much quicker estimates, using only historical data. This is not in the 2.4.4p3 code.
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