Hi,
The issue is probably due to the small average file size. Depending on the file
system type and operating system, 30K average file size may be the issue,
particularly if you have a split between sets of data (if 10% of the files are
1MB+, then the remainder are 10K or less).
The only option for a timely backup is to break things up into multiple backup
processes, or do a raw backup. (Raw backup requires that no changes are
occuring on the file system, however).
One thought--if you are using an EVA, use the EVA snapshot, mount that on the
backup server, and then back that up there, and accept that it'll take a few
days to back up.
When you say you are migrating to a Centera, what application are you going to
use to get the files onto the Centera? The Centera is content-accessible only,
so you can't restore directly to it.
Dave
Date: Tue, 19 Jul 2005 12:36:12 -0400
From: Randy Doering <rdoering AT COMCAST DOT NET>
Subject: No Index Save Question
Greetings, I'm in the midst of trying to get a full backup of a file system
that is alittle of 4 TB and contains more than 132 Million files.
When I started this yesterday, I noticed it was backing up at around 20-22
MB/s, and I started to calculate how many hours this would take after it
had filled the first tape.
Well, today it is backing up at 150-190 KB/s and the System CPU is pegged.
At this rate, we looking at at least a month to get this backup finished.
We have concluded that the system is trying to keep the index information
and that is the reason for the slow down.
I have noticed a button in the Group that is called: "No Index Save". So,
what does this button actually mean?
We are in the middle of moving the file systems from an HP-EVA based file
system to an EMC Centerra, and was planning on restoring to the EMC
Centerra.
So, will using the "No Index Save" speed things along and more importantly
will I be able to restore?
Thanks,
Randy
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