similar to: How to dig deeper

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

on Solaris 10 5.10 Generic_118822-23 sun4v sparc SUNW,Sun-Fire-T200 I run #iostat -xn 5 to monitor the IO statistics on SF T2000 server. The system also have a heavy IO load, for some reason iostat donot refresh (no any update). It seems like iostat is calling pause() and stucked there. Also my HBA driver''s interrupt stack trace indicates there is a lot of swtch(), the overall IOPS

Hi Experts, _write value ------------- Distribution ------------- count 4096 | 0 8192 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1161825 16384 | 2754 32768 |@

Hello, I''m using the below dtrace script to capture the flow and times of kernel functions, from an ioctl() call. After an entry into restorectx(), the trace of startimestamp - vtimestamp makes a dramatic jump downwards. Here''s the snippet showing the jump... 6 -> di_checkmem 8 220176600 6 <- di_checkmem

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

The big problem that I have with non-directio is that buffering delays program execution. When reading/writing files that are many times larger than RAM without directio, it is very apparent that system response drops through the floor- it can take several minutes for an ssh login to prompt for a password. This is true both for UFS and ZFS. Repeat the exercise with directio on UFS and there is no

I had to let this go and get on with testing DB2 on Solaris. I had to abandon zfs on local discs in x64 Solaris 10 5/08. The situation was that: * DB2 buffer pools occupied up to 90% of 32GB RAM on each host * DB2 cached the entire database in its buffer pools o having the file system repeat this was not helpful * running high-load DB2 tests for 2 weeks showed 100%

2011/10/26 Sage Weil <sage@newdream.net>: > On Wed, 26 Oct 2011, Christian Brunner wrote: >> >> > Christian, have you tweaked those settings in your ceph.conf?  It would be >> >> > something like ''journal dio = false''.  If not, can you verify that >> >> > directio shows true when the journal is initialized from your osd log?

Does samba 3.0.23c not support the use of O_DIRECT? When I try to open an smbmount'd file using O_DIRECT, I get EINVAL. I am able to use O_DIRECT with no problems on a block device and nfs mounts, so I know the kernel supports it. samba: 3.0.23c kernel: 2.6.9-42.0.3.EL (32-bit) I am using the below code for my test. smb fails on open(2). #include <fcntl.h> #include

I had some trouble installing a zone on ZFS with S10u4 (bug in the postgres packages) that went away when I used a ZVOL-backed UFS filesystem for the zonepath. I thought I''d push on with the experiment (in the hope Live Upgrade would be able to upgrade such a zone). It''s a bit unwieldy, but everything worked reasonably well - performance isn''t much worse than straight

Hi, When attempting to restore to LINUX RHEL5 - OCFS2 filesystem received the following error during RMAN restore for nearly all of the datafiles attempted to restore with exception of a couple of smaller datafiles which were smaller < 2GB. ORA-19870: error reading backup piece /db/dumps/TR1_1/rmanbackup/TR1_88_1 ORA-19502: write error on file "/db/devices/db1/PR2/pr2_1/pr2.data1",

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

Currently I''m trying to figure out the best zfs layout for a thumper wrt. to read AND write performance. I did some simple mkfile 512G tests and found out, that per average ~ 500 MB/s seems to be the maximum on can reach (tried initial default setup, all 46 HDDs as R0, etc.). According to http://www.amd.com/us-en/assets/content_type/DownloadableAssets/ArchitectureWP_062806.pdf I would

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

On Oct 4, 2011, at 3:53 PM, Eli Friedman wrote: > On Tue, Oct 4, 2011 at 3:10 PM, Khaled ElWazeer > <khalid.alwazeer at gmail.com> wrote: >> Hi, >> >> I have some code which has sigsetjmp / longjmp. After a longjmp, unreachable >> is inserted, which is fine. The problem is that in the backend before >> calling longjmp, some register was spilled to a

hi, i am trying to install oracle rac on fedora core 6 through iscsi. when i try to mount, mount.ocfs2: Invalid argument while mounting /dev/mapper/rac-crs on /mnt/crs. Check 'dmesg' for more information on this error. error log in dmesg, ocfs2: Unmounting device (253,11) on (node 255) (27354,0):ocfs2_parse_options:753 ERROR: Unrecognized mount option "datavolume" or missing

It is probably not strictly related to SAMBA itself but let me try to ask you for advice. Using smbmount I have mounted one of smb/cifs share to /root/test. This share has RW access and no authentication is required. Now, under DOSBox, whenever I try to mount /root/test I get this error (command sent under DOSBox: mount c /root/test). Directory /root/test doesn't exist. Any other directories,

That code should do it, but I realized you only detect setjmp functions by name. My code is calling "__sigsetjmp" not "segsetjmp". You only support these functions: static const char *ReturnsTwiceFns[] = { "_setjmp", "setjmp", "sigsetjmp", "setjmp_syscall", "savectx", "qsetjmp",

>also - for async io ; >p2448994_9204_LINUX.zip is the patch to apply for oracle >(this is metalink ARU patch number). Wim, The patch description on Metalink says: DIRECT IO SUPPORT ON EXT2 FILESYSTEM Which wasn't quite what I was expecting. Kevin -----Original Message----- From: Wim Coekaerts [mailto:wim.coekaerts@oracle.com] Sent: 25 November 2003 03:23 To: Brian M. Diehl