search for: forcedirectio

Hi, I''m working on some performance analysis with our database and it seems that when the file system (UFS) is mounted with forcedirectio, the IO probe are not triggered when an I/O event occurs. Could you confirm that ? If so, why ? Seb -- This message posted from opensolaris.org

Hi samba experts, We have a strange file locking problem and i hope someone can help. We use some CentOS 5 servers, which use samba 3.0.33, to share files of a java application to clients. Clients are mostly CentOS 5 (same version as the server), but there are a few legacy windows clients (the reason why we use samba and not nfs). And now the problem. When our developer uploads a new jar file to

In order to get more information on IO performance problems I created the script below: #!/usr/sbin/dtrace -s #pragma D option flowindent syscall::*write*:entry /pid == $1 && guard++ == 0/ { self -> ts = timestamp; self->traceme = 1; printf("fd: %d", arg0); } fbt::: /self->traceme/ { /* elapsd =timestamp - self -> ts; printf("

...://blogs.sun.com/pgdh/entry/taking_ufs_new_places_safely but I wondered if there was anything else that could be done to avoid having to take such measures? I don''t want to stop writes to get a snap, and I''d really like to avoid UFS snapshots if at all possible. I tried mounting forcedirectio in the (mistaken) belief that this would bypass the UFS buffer cache, but it didn''t help. -- Rasputin :: Jack of All Trades - Master of Nuns http://number9.hellooperator.net/

Hi, I''m preparing a personal TPC-H benchmark. The goal is not to measure or optimize the database performance, but to compare ZFS to UFS in similar configurations. At the moment I''m preparing the tests at home. The test setup is as follows: . Solaris snv_37 . 2 x AMD Opteron 252 . 4 GB RAM . 2 x 80 GB ST380817AS . Oracle 10gR2 (small SGA (320m)) The disks also contain the OS

How can I tell if this is normal behaviour? Oracle imports are horribly slow, an order of magnitude slower than on the same hardware with a slower disk array and Solaris 9. What I can look for to see where the problem lies? The server is 99% idle right now, with one database running. Each sample is about 5 seconds. I''ve tried setting kernel parameters despite the docs saying that

I am pretty new to Dtrace but use the Dtrace Toolkit when trying to troubleshoot I/O issues On Oracle. I am looking for help on how to do the following: I am trying to answer whether adding more HBA Cards/ports would be effective. To do this, I need to know the i/o''s per second As well as total bandwidth per second. Has anyone done this before? Does anyone have any other ideas on how