[Asterisk-Users] SUCCESS - 512 Simultaneous Calls with Digital Recording

[Michael Welter]

Patrick wrote:
> On Tue, 2005-09-20 at 18:37 -0400, Matt Roth wrote:
> 
>>List users,
>>
>>Over the last few days we have been working with MCI's development lab 
>>to test our Asterisk setup.  We were using a piece of hardware called an 
>>Abacus 5000 that is capable of creating and terminating thousands of SIP 
>>calls.  Initially, we could not get past 64 simultaneous digitally 
>>recorded calls without having call quality issues including dropped 
>>calls.  We identified an I/O bottleneck and rectified it by digitally 
>>recording to a RAM disk.  Using this method, we were able to digitally 
>>record 512 simultaneous SIP-to-SIP calls with 100% call completion.
>>
>>Our plan is to use the MONITOR_EXEC hook to call a custom program that 
>>will copy files to the hard disk at call completion.
> 
> 
> Matt,
> 
> Interesting stuff. Did you test copying of the recordings on the ramdisk
> to a local harddisk also during that 512 call load? Just wondering if
> that copy action wouldn't also create an I/O bottleneck and cause call
> quality issues under load. Did you consider using remote storage e.g.
> via nfs, a fibre channel or iSCSI link to a SAN?
> 

I use 3Ware RAID cards in my systems with write cache turned on.  I'm 
wondering if this presents a reduced interrupt load on the system than 
directly-attached hard drives?