Paul Bijnens wrote: > Patrick M. Hausen wrote: > > > > Seems like Oracle likes to create a lot of small ".trc" files over > > time. The filesystem in question is littered with thousands of them. > > > > Once we archived and deleted them, backup performance was back to normal. > > > > Would separate holding disk (we don't use one at all at the moment) > > help in a configuration like this? Additionally I'd suggest deleting > > Probably, then your tapedrive can keep streaming (could half your > backuptime!), and amanda can do much more parallel then it can do > without holdingdisk (another doubling or more if you have many > clients).
Precisely. In all multi-client installations I run in my own network I have holding-disks, so dumps can be run in parallel and output buffered. But the machine in question is a one-server-client installation that only backs up itself. And in addition it mainly backs up one single file system. So my question is: does a holding-disk speed up this process? I mean, Amanda will start a dumper on the filesystem that starts filling the holding-disk. At the same time (?) a taper will start wrtiting the holding-disk's contents to tape. Now imagine the dumper getting to slow for the tape ... the holding-disk won't be filled quick enough either. Then there's a lot of seeks on the holding-disk itself, if it's read and written at the same time. Or is the mental picture I have about Amanda's operation incorrect? Thanks, Patrick M. Hausen Technical Director -- punkt.de GmbH Internet - Dienstleistungen - Beratung Scheffelstr. 17 a Tel. 0721 9109 -0 Fax: -100 76135 Karlsruhe http://punkt.de
