[Samba] Samba process throttled back?
jra at samba.org
Mon Jun 20 13:49:07 MDT 2011
On Fri, Jun 17, 2011 at 09:39:16AM -0400, Lang, Rich wrote:
> We are running Samba 3.0.33 on a 2-node Linux cluster running RedHat 5.6 ES. Its primary application is to serve out a single network drive to support our business (out 350GB in size). For several years, this solution has been running flawlessly. File access was almost as fast as a local disk, so putting files on the server was never a problem. Our clients are running mostly Windows XP Pro. We have a few Windows 7 clients.
> Almost a year ago, that changed. Applications written in VB 6.0 that read files from the server started showing *significant* performance problems. What used to take seconds now takes more than a minute to finish. Moving the file to a local disk brought the speed back up to where it should be. Moving the file to a Windows 2003 or 2008 server also provided good throughput. All clients experience this same problem.
> I ran "strace -f" against the smbd process that is assigned to my desktop and then ran the VB application to see what the daemon was up to. I discovered that it went through a process of opening the file several times and reading data from it, using progressively smaller buffer sizes until is settled on using a buffer size of 1, which it used for the remainder of the file I/O session.
This *seems* like clients not using oplocks, when previously
they were. Has anything changed in the server system that might
be denying oplock requests ?
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