Re: Backup Devices

Posted in 1997

Topics: Performance & Tuning, Platform-Specific Issues

Victor Tan — 24 Jul 1997 16:43:42 GMT — source: Informix-list mailing list archive (1991-1998)

JMDooney (jmdooney@tasc.com) wrote: > I'm running Informix OnLine 5.05 on an HP E45 Server, hp-ux 9.04. My > database is only 40GB, but the level 0 Informix backups are taking over > 15 hours to complete using the HP 4mm DAT drive . Can someone recommend > a tape device they are using that can improve my backup performance. > Thanks > JMDooney > jmdooney@tasc.com The HP 4mm DAT (DDS2) has a native transfer rate of 24 Mb/min which to me implies that theoretical max speed for 40Gb means that it will still take 28 hrs but since it compresses, you do it in 15 hrs. If you convert to a DDS3, that should halve your time as it has a native/compressed transfer rate of 60/120 Mb/bin and you get to stay with HP's products. The exabyte 8mm Mammoth would be up to 3 times as fast as the DDS3 which means that your 15 hrs could become as short as 2.5 hrs. And with a DLT7000 (Quantum), it will be about 1.5 hrs or less. The final question is ... How much is it worth to you? - Victor Tan