Oops, I should have sent my reply to the list. On Fri, 28 Jan 2011 16:35:05 -0500 Joe Konecny <[email protected]> wrote:
> On 1/28/2011 2:11 PM, Charles Curley wrote: > > For now, with 100 GB of data going to a 1 TB hard drive, you can > > probably back up to that hard drive. But not for long. Two caveats: > > > > * Having your data, holding disk, and vtapes all on the same drive > > will result in lots of disk drive thrashing. Ideally, have each on > > their own drive. Short of that, eventually go to a separate drive > > for the vtapes. > > My data would be on a different server than the vtapes. Does a > holding disk make a big difference if you are using vtapes? > > Yes. vtapes emulate a tape to the point that amanda won't write to them in parallel, just as it cannot write to a tape in parallel. A holding disk lets amanda always have one or more DLEs ready to go to the tape. While shoe-shining obviously isn't an issue with vtapes, that one DLE at a time requirement is a bottleneck. There is an effort to allow one configuration to write to multiple tape drives (including vtapes), but I don't know its status. That might move things along fast enough to reduce the need for a holding disk, but I haven't played with it. -- Charles Curley /"\ ASCII Ribbon Campaign Looking for fine software \ / Respect for open standards and/or writing? X No HTML/RTF in email http://www.charlescurley.com / \ No M$ Word docs in email Key fingerprint = CE5C 6645 A45A 64E4 94C0 809C FFF6 4C48 4ECD DFDB
