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?
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