The top comment was mine. That figure was the average speed we are getting backing up our filers (10 760's, 300-600Gb each. We are backing up each volume separately). So, the number I used (15, but I think we actually average around 17.5), was for one tape stream. So, since we have two tape streams, we actually achieve twice that per hour.
Note that our times vary from 12gb/hour to 23gb/hour, depending on the filer. We believe this to be due to the nature of the data on the various filers.
Looking forward to seeing what we can accomplish with two tape drives/four tape streams.
By the way, we are using NetBackup with NDMP to a StorageTek 9710 with DLT7000 drives and are using the compressed tape devices.
Kelly
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Kelly Wyatt Systems Programmer SAS Institute Inc. Kelly.Wyatt@SAS.com mailto:Kelly.Wyatt@SAS.com www.sas.com
-----Original Message----- From: Will Harper [mailto:willh@infi.net] Sent: Thursday, March 25, 1999 9:16 AM To: NetApp Toasters (E-mail) Subject: NDMP backup speeds
Can I have the users' opinions? The top statement was from an unnamed NetApp 740 filer user. The bottom part is NetApp's rebuttal. I see this as two questions. (1) can a 740 support two tape adapters? and (2) who is right(er) about NDMP backup speeds on a 740, with one tape drive adapter?
------------------------------------------------------------------------ ------------------------------- [USER] > With a (potentially) 1.4Tb filer, can it be backed up with two drives > reasonable amount of time???? At 15gb/hr (conservative with > NDMP), that's > lots of hours to back em up..."
------------------------------------------------------------------------ ------------------------------ [NetApp] Two tape adapter support was certified (tested) only on the F760 and the F630. It was a matter of testing resources with our latest release.
Dump speeds run at up to 25 GB/hr with 1 dump and up to 45 GB/hr with two dumps to two tape drives on a single tape adapter.