I have 2 VXA drives installed on an upgraded 8500 to a 300mhz G3. I get an
average of 160mb/min with an Adaptec 2940uw card. VXA has built-in
compression so turn off software compression.

I took Retrospect off my server. I prefer separation of services. I didn't
have any problems but lots of people did. I believe Jon Gardner who watches
this list can give you greater insight on Retrospect/ASIP.


Garret J. Cleversley
Vice President/General Manager
Center Page, Inc.
---personal info---------------------------------

> From: "Craig Isaacs" <[EMAIL PROTECTED]>
> Reply-To: "retro-talk" <[EMAIL PROTECTED]>
> Date: Sat, 1 Apr 2000 18:35:44 -0800
> To: "retro-talk" <[EMAIL PROTECTED]>
> Subject: RE: Ecrix VXA tape drive performance
>> We bought an internal VXA 1 SCSI tape drive to replace the DLT 4000 that
>> died on us last week.  Our backup server is a Powermac 7200/90.  While the
>> price and capacity of  the device are great (< 66 GB with 2:1 compression),
>> we are having trouble getting the data transfer rate even close to what the
>> DLT provided.
>> Using Retrospect 4.2, we backup over our 100Mb TCPIP network, from b/wG3
>> 300 ASIP server.  The DLT gave us <80MB/minute in the same configuration.
>> The VXA drive transfer rate ranges from 18 to 45MB/minute. After
>> eliminating SCSI and ethernet problems, we have seen little improvement.
>> I can only conclude that the DLT has a superior speed due to the native
>> hardware compression.
> Software compression will slow your backups, especially on a 7200/90. Try
> turning
> off the software compression. That will at least give you a baseline.
>> The question is this:  Does processor speed have that great an impact on
>> transfer when using software compression?  Would a G3 improve the software
>> compression speed enough to get the transfer rates up above 70MB/minute?
> A G3 would definitely be faster.
>> BTW, I tried running Retrospect on the ASIP server, and when I arived the
>> next morning, my server had locked up...no files had been backed up.  Is
>> this a known issue with ASIP 6.2?
> I'm not in tech support, so I don't know all the issues. Other folks on the
> list
> will certainly have opinions. I know Retrospect works for a lot of people with
> ASIP 6.2, so you may want to send an email to [EMAIL PROTECTED] if you
> are
> planning to move the tape drive to that computer.
> Craig
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