I can't say for sure, but according to my testing, each save stream is
limited to a certain percentage of the total machine. It makes sense since
Legato wants a backup to run in the background without bringing the client
to it's knees. The way to do a backup when you want speed without regard to
client load is (as you discovered) to schedule multiple save streams.
Clumsy but effective.
Is this single save stream from a single hard drive, or an array? Try an
FTP "put" from the save stream source location to a known fast file system.
Then FTP "get" back to the same location. Compare this to the networker
speeds you get. You may be surprised.
Also bear in mind that 7MB/Sec is faster than many tape drives can handle.
My problem is why I can't backup my Windows 2000 server with 150,000 small
files at a speed over 20-40KB/second. Now that's a problem............;-)
Calvin Thomas
UNIX System Administrator
NACA Logistics
-----Original Message-----
From: David E. Nelson [mailto:david.nelson AT NI DOT COM]
Sent: Thursday, 08 May, 2003 07:39 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Why can't 'save' or 'savepnpc' write more ~7MB/Sec?
Hi All,
Through recent testing w/ a Hitachi 9970 and one FCAL 9840A, it was
determined
that a single save stream could only drive ~7MB/Sec. When multiple save
streams were implemented on the same filesystem, we where able to achieve
+25MB/Sec.
Is there any tuning that can be done so that one save stream can achieve max
throughput?
Thanks,
/\/elson
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