Am Donnerstag, den 22.07.2010, 09:30 -0400 schrieb Dustin J. Mitchell: > On Thu, Jul 22, 2010 at 4:04 AM, Dominik Schips <[email protected]> wrote: > > With normal configuration the 500 GB full backup to tape took about > > 10-11 hours. > > > > With the split tape config it took about 16 hours to backup 116 GB and > > amanda ist still running to backup the other data. > > When doing a split write without holding disk, Amanda must cache all > of the data it writes. That additional write can be time-consuming! > Also, when not using holding disk, your write speed is constrained by > the speed of the process actually dumping your filesystem (probably > gnutar?), which for filesystems with a lot of small files can be very > slow.
Yes it is gnutar with lots of small data (mailserver data). > > Any advice or solution how to debug the problem (correct) and get normal > > write performance with split tape dumps config? > > * Add holding disk > * Use a newer version of Amanda > * Split in memory or use a faster disk for your split_diskbuffer Thank you for the fast help. I'll try it with a holding disk. -- Best regards Dominik Schips
