Well, I received a number of responses from a number of people. I really
appreciate all the responses. It was interesting the response that I received,
several agreed with the statement, but a number did not and several very
interested in the summary.
The answer is, yes a file can span volume sets as described in the original
message. Several users sent examples illustrating the fact using showfile
commands etc. Also there are commands such as migrate which allows you to
distribute files across volumesets and stripe which will stripe a file.
The answer is a file would grow to 8gb and not be limited to 4gb.
As for the performance questions, for those individuals who addressed this,
thought that doing it this way would not have as good of performance as having a
8gb hardware stripe set or hardware raid 5. However, as one person indicated, a
good set of test to illustrate this is needed to understand the difference in
performance.
jim jones
Jim R Jones <Jim.R.Jones_at_Cummins.com> on 04/11/2000 08:14:36 AM
To: tru64-unix-managers_at_ornl.gov
cc: (bcc: Jim R Jones/Corp/Cummins)
Subject: settling question
Hello,
I am writing to the list to help solve an internal debate we are having. The
debate deals with advfs volumes and stripe sets. The root of the arguement is
the following:
A file can only be as big as the volume that it resides on. Files cannot
cross volume sets. For example if you have a two stripe sets of 4gb and you
put the two stripe sets together using advfs addvol command to create a 8gb
file structure, the largest file cannot be larger than 4gb because files
cannot cross volume sets.
It is an easy way to grow file structures I agree, but there are several
limitations, I/O performance, and file sizes are the main limitations in doing
this. A 8gb or what ever size stripe set should give better read & write
performance than a series of stripe sets bound together by the addvol command.
What does the list think, I will summarize. If you need more info just ask.
jim jones
Received on Wed Apr 12 2000 - 18:33:48 NZST