I don't have the fine detail reason but the "in a nutshell" reason is that for every
file backed up there is a compare between the *SM server DB and the client as to file
name and date to see if it needs to be backed up or what. (That to me is main reason
for lot of small files taking longer than a few large files.)
This can be improved some with tuning some COMM parameters. I haven't done much in
that area, maybe someone could enhance on that.
David B. Longo
System Administrator
Health First, Inc. I/T
3300 Fiske Blvd.
Rockledge, FL 32955-4305
PH 321.434.5536
Pager 321.634.8230
Fax: 321.434.5525
[EMAIL PROTECTED]
>>> [EMAIL PROTECTED] 02/14/01 10:04AM >>>
Using an NT Client and an AIX Server
Does anyone have a TECHNICAL reason why I can backup 30GB of 2GB files that are
stored in one directory so much faster than 30GB of 2kb files that are stored
in a bunch of directories?
I know that this is the case, I just would like to find out why. If the amount
of data is the same and the Network Data Transfer Rate is the same between the
two backups, why does it take the TSM server so much longer to process the
files being sent by the larger amount of files in multiple directories?
I sure would like to have the answer to this. We are trying to complete an
incremental backup an NT Server with about 3 million small objects (according
to TSM) in many, many folders and it can't even get done in 12 hours. The
actual amount of data transferred is only about 7GB per night. We have other
backups that can complete 50GB in 5 hours but they are in one directory and the
# of files is smaller.
Thanks
Network data transfer rate
--------------------------
The average rate at which the network transfers data between
the TSM client and the TSM server, calculated by dividing the
total number of bytes transferred by the time to transfer the
data over the network. The time it takes for TSM to process
objects is not included in the network transfer rate. Therefore,
the network transfer rate is higher than the aggregate transfer
rate.
.
Aggregate data transfer rate
----------------------------
The average rate at which TSM and the network transfer data
between the TSM client and the TSM server, calculated by
dividing the total number of bytes transferred by the time
that elapses from the beginning to the end of the process.
Both TSM processing and network time are included in the
aggregate transfer rate. Therefore, the aggregate transfer
rate is lower than the network transfer rate.
"MMS <health-first.org>" made the following
annotations on 02/14/01 10:57:45
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