Re: Backup Devices

Posted in 1997

Andreas Zeugswetter — Mon, 28 Jul 1997 16:24:45 +0200 — source: Informix-list mailing list archive (1991-1998)

Since you are using Informix 5, I guess you are using ontape for backup, which makes me ask, how fast can you make a backup to a symbolic link to /dev/null . This will be as fast as you get anyway. We do 40 Gb (31Gb used) to a pipe with: gzip --fast -c < /informix/etc/tapedev | split -b512m - /backup/informix.level.0. in 6h 30m to a local filesystem. The archive level 0 then uses about 5.7 Gb in 11 files. Our bottleneck now is the CPU needed for compression (the writing side). You might also increase performance if you archive to a pipe using gzip --fast to compress the data before it gets written to tape (using dd) if you have fast CPU's. gzip --fast -c < /informix/etc/tapedev | dd of=/dev/<whatever> bs=256k so long Andreas Zeugswetter