Hi everyone,
For anyone who was following the earlier thread about noise problems on *, here's a little gem from Digium support.
In a nutshell Digium told us that they thought that low accuracy results from zttest were the cause of noise problems that we have been experiencing. We re-configured the box to give the TDM400P its own IRQ, but found that the zttest results were still lower than what Digium recommended they should be. When I asked them for further information on how to improve this they replied:
** Extract begins **
SCSI RAID can cause the problem. If disabling hyper threading does not resolve your problem my next suggest would be to revert to a PATA IDE hard drive solution configured to UDMA level 2 using hdparm. SCSI or SATA causes problems on some systems from what I have seen. The problem increases when using a SCSI or SATA RAID.
** Extract ends **
I really hope that they are wrong, as I don't feel like throwing away my nice expensive Ultra320 SCSI RAID controller and hot plug drives and replacing them with some crusty old IDE config. Needless to say I'm not going to go and shell out on IDE controller & drives until I'm a little more certain that this is actually a problem and have asked them for more information.
Does anyone else find it odd that the TDM could possibly have a problem sharing a box (but not an IRQ) with a SCSI controller?
Combined with the fact that they have also recommended that we turn off hyper threading (also causes problems with TDM, apparently), I'm wondering if these cards shouldn't come with a warning not to use anything with half decent performance in your * server!
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