Hi Matt I took your advice and tried backing up / on the backup server (excluding /dev and /proc of course) to tape and tar reported:
Total bytes written: 1427005440 (1.3GB, 1.2MB/s) It took about 15 minutes to complete this. My fileserver has about 30GB worth of data. So, it would take approximately 6 hours to complete using tar. This is just for the fileserver. It's actually taking a lot longer than 6 hours (since it has to come over through the network) but anyway... using Arkeia, I can backup the fileserver AND mail server (which is only an extra 3 or so gigs) in 2 hours and 20 minutes. Arkeia reports the speed was 180MB/min. There's something I'm doing wrong here and Arkeia is doing right because I don't understand how Arkeia can backup ~160 faster than tar. Any further ideas?? On Tue, 2002-04-09 at 17:56, Matt Hyne wrote: > > Generally, tapes are streaming, so it is possible that if the transfer rate > across the network is slow then more tape may be required for the same > amount of data. > > Really - you need to determine the bottleneck - can you tar from one > machine to the HDD on another and see how long it takes - and then locally > tar this data to the tape drive. That should give you some good ideas of > where the performance bottleneck is. > > At Tuesday, 09-04-02 16:42 (+1000), Gonzalo Servat wrote: > >Hi All > > > >I was performing backups across the network using Arkeia until one day > >the wrong tape was inserted and the whole tape cycle went haywire (as it > >requires you enter the right tape with the right label or you get a nice > >email in the morning asking you to insert the right tape - when infact, > >I DID enter the right tape) and so I got pretty p@#@ed off at Arkeia and > >decided to switch to using tar (as I can insert any tape and it will > >write, plus tar is pretty universal accross *nix systems so I can > >restore on any system) > > > >Aaaanyway, the point of my story is... it would normally take ~2.5hours > >to backup 33GB across the network using Arkeia to tape. > >With tar, it takes over 8 hours at which point it gives me a nice "no > >space left on device" message on the screen. > > > >I'm not using gzip compression. I've tried this and it doesn't help the > >speed problem (or capacity problem) > > > >The backup unit is an Ecrix VXA-1 using V17 tapes. > > > >Any ideas?? > > > >Thanks in advance! > > > >Regards, > > > >Gonzalo. > > > > > >-- > >SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ > >More Info: http://lists.slug.org.au/listinfo/slug > > > -- > SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ > More Info: http://lists.slug.org.au/listinfo/slug -- SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
