Ronald Vincent Vazquez wrote: > The next questions are, how will amanda back up a single volume exceeding > 5 TB (10-14 TB) and how long will it take to write it to tape? Should we > be asking an average of how long does amanda takes to collect and write 1 > TB of data to tape and multiply by X? Ok, let say that our volume grows > to 10 TB, how long would the cycle have to be to perform a level 0 of this > bad boy?
The backup time for 10TB will probably be close to 10x the time for 1TB, assuming all the data is similar in number of files per gig (for tar, for dump I don't think it matters) and compressibility. The real question is going to be the length of your backup window in relation to your backup speed. For data that size you may need to run multiple drives in parallel with the RAIT driver, and even that might not help if you can't read the disk fast enough to keep up, depending on the data layout on the disk, plus all the usual bus bottlenecks, etc.. I would personally leery of backing it up as a single entity, you lose Amanda's ability of keeping daily tape usage balanced via spreading the level 0s around to different days. Also, what happens when you hit an error 9TB into your 10TB backup, do you end up with nothing (or at least nothing easy to recover from)? Frank > > Have a great weekend everyone, > > ///////////////////////////////////////////////// > Ronald Vincent Vazquez > Senior Unix Systems Administrator > Senior Network Manager > Christ Tabernacle Church Ministries > http://www.ctcministries.org > (301) 540-9394 Home > (240) 401-9192 Cell > > For web hosting solutions, please visit: > http://www.spherenix.com/ > -- Frank Smith [EMAIL PROTECTED] Sr. Systems Administrator Voice: 512-374-4673 Hoover's Online Fax: 512-374-4501
