Re: How to force amanda to serialize dumper/taper

2006-12-08 Thread Evan Harris
Unfortunately, I am out of IDE ports on the motherboard, and have no remaining open expansion slots either. Might try a USB drive, but I'd much rather find a software solution rather than a hardware one. Evan On Fri, 8 Dec 2006, Alexander Jolk wrote: Hi, Evan On 12/7/06, Evan Harris <[EM

Re: How to force amanda to serialize dumper/taper

2006-12-08 Thread Brian Cuttler
Evan, On Thu, Dec 07, 2006 at 04:52:52PM -0600, Evan Harris wrote: > > On Thu, 7 Dec 2006, Brian Cuttler wrote: > > >I've assumed that the spindle the amanda work area is on was dedicated > >to the work area and not split, I know nothing about the architecture > > That is correct. That disk is

Re: How to force amanda to serialize dumper/taper

2006-12-08 Thread Alexander Jolk
Hi, Evan On 12/7/06, Evan Harris <[EMAIL PROTECTED]> wrote: The only way to reliably fix the shoe-shine problem (absent replacement of hardware) [...] Is adding another disk completely out of the question? I have just commissioned a new amanda server with an LTO-3 drive (60MB/s writing speed)

Re: How to force amanda to serialize dumper/taper

2006-12-07 Thread Evan Harris
On Thu, 7 Dec 2006, Brian Cuttler wrote: I've assumed that the spindle the amanda work area is on was dedicated to the work area and not split, I know nothing about the architecture That is correct. That disk is only used by amanda. of the specific system bus. If you are able to get throug

Re: How to force amanda to serialize dumper/taper

2006-12-07 Thread Brian Cuttler
Evan, On Thu, Dec 07, 2006 at 03:39:05PM -0600, Evan Harris wrote: > > I am NOT peaking at 10MB/sec from the amdump report, the 10MB/sec figure is > from several amtapetest runs, as well as my own manual testing with dd. > > I KNOW the tape is shoe-shining, both because I can HEAR it consisten

Re: How to force amanda to serialize dumper/taper

2006-12-07 Thread Evan Harris
I am NOT peaking at 10MB/sec from the amdump report, the 10MB/sec figure is from several amtapetest runs, as well as my own manual testing with dd. I KNOW the tape is shoe-shining, both because I can HEAR it consistently having to reposition the tape every few seconds, and because I'm only g

Re: How to force amanda to serialize dumper/taper

2006-12-07 Thread Brian Cuttler
On Wed, Dec 06, 2006 at 04:33:16PM -0600, Evan Harris wrote: > > Debian testing, SDLT 110/220, Intel P4 2.8Ghz 3gig RAM. Amanda 2.5.1p1-2. > > The holding disk is a dedicated PATA IDE drive (master) on its own > cable/bus (no slave). The tape drive is on its own SCSI bus (no other > devices).

Re: How to force amanda to serialize dumper/taper

2006-12-06 Thread Evan Harris
Unfortunately, eliminating (or drastically reducing) the holding disk workaround won't solve the problem in my case, since several of my larger dumps are from nonlocal disks, and the machines they are on cannot sustain a write across the network that is fast enough to keep the tape drive stre

Re: How to force amanda to serialize dumper/taper

2006-12-06 Thread Evan Harris
Debian testing, SDLT 110/220, Intel P4 2.8Ghz 3gig RAM. Amanda 2.5.1p1-2. The holding disk is a dedicated PATA IDE drive (master) on its own cable/bus (no slave). The tape drive is on its own SCSI bus (no other devices). Bonnie tests on the IDE drive give roughly 20MB/sec, and I have no trou

Re: How to force amanda to serialize dumper/taper

2006-12-06 Thread Brian Cuttler
Evan, What OS, type of tape, type of drive, HW platform ? I'm unfamiliar with a parameter to do what your asking for for good measure, what version of Amanda ? Actually, how did you determine that a drive within a changer was shoe-shining ? What else shares the bus with the tape and with the am

How to force amanda to serialize dumper/taper

2006-12-06 Thread Evan Harris
I'm having a problem with my tape drive shoe-shining because the holding disk can't keep up with the tape drive if it is also being written to by a dumper. Without the extra disk seek overhead of dumpers writing to the holding disk at the same time, the holding disk should be plenty fast enou