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Re: [Veritas-bu] Tuning Settings on NetBackup Client (Windows)
2012-11-28 10:07:09
Simon,
The network buffer size is a client setting and done per client. You can set it for one client, but not the others, though I recommend you implement it on all of them.
The Number and Size data buffers settings are on the Media servers (in this case it is also your Master).
I recommend changing one setting at a time and testing them. I would set the network setting first, then SIZE_DATA_BUFFERS and then NUMBER, testing performance/behavior on each along the way. Be careful especially when using the NUMBER settings as this can drastically change the amount of memory used during backups and could cause shared memory errors (89 exit codes, I think). You are going to see the biggest bang for buck on changing the SIZE_DATA_BUFFERS settings. The guides talk about this in more detail and has a formula for figuring out how much memory will be used, etc.
Different tape drivers on Windows may allow you to use a larger tape buffer size, but I think you're still limited compared to Unix. Testing will let you know where things start falling apart. There are lots of blogs out there with info on this if you search for NetBackup tuning.
Lastly, you could investigate jumbo frames on the network side, but that has more implications and needs to be discussed thoroughly with your network admin. There's also multistreaming, flashbackup, SAN client, etc. You can also upgrade to 7.5 and use the new accelerator option.
Good Luck!
-Rusty
On Wed, Nov 28, 2012 at 7:12 AM, Justin Piszcz <jpiszcz AT lucidpixels DOT com> wrote:
Hi Simon,
I think they control everything (top->down) as I recall testing this in the past once the master was changed; it altered the buffers on all of the media servers.
Likewise, if you have a DSU on your master, you could also benefit from the following:
SIZE_DATA_BUFFERS_DISK
I recommend the following (gathered mostly from white papers/etc. for top performance for LTO-3/4/5 drives)
NUMBER_DATA_BUFFERS: 32
NUMBER_DATA_BUFFERS_RESTORE: 32 SIZE_DATA_BUFFERS: 262144
SIZE_DATA_BUFFERS_DISK: 262144
Having said that, I also have the exact same touch files (UNIX) on the media servers.
Justin.
Following on from the documentation below, can I just ask, that if I want to improve performance on a Windows 2003 client, where the backup is done on the LAN, if I follow this document, am I right in thinking, these settings should be put in place on the MASTER Server as well?
I ask, because the document talks about a Media Server, which a Master Server could well be, and in this environment, I have one master that does ALL the backups.
Reason I am looking at this, is to try and improve backup performance for the LAN, but it is a Windows client.
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