> You should not use -z at ALL with large numbers of small > files. The increased latency of the > compression/decompression will far exceed any time saved in > transmission. You're not on a 300 baud modem, I assume? > -z should be used when you are sending large files that are > compressible in the first place (so not video or mp3s, for > example), but it it only going to hurt you on small files.
I was lurking your thread, when I stumbled across your considerations about "-z" option. I'm having issues with slow network, which I presume is the main cause of failure in rsnapshot sync tasks. Do you suggest to try *without* compression to see if something works better? > How small? Depends on your connection. My rule of thumb, > based on nothing at all, is that the speed in megabits of my > connection is the > size in megabytes that I start worrying about compression. > Compressible data over 15MB in size? OK, I will start to > think about using -z. If I was on a T1? 1.5MB. ADSL? 700K. > Arbitrary, perhaps, but it seems to have served me well. In > fact, I found removing -z sped up transfers quite a bit on my LAN. Uhm... It's quite interesting the way you somehow "arbitrarily" choose when to worry about compression.... Is there any way to know *in advance* if using or not using "-z" could be the better solution? TIA, Flavio. -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html