search for: directios

Displaying 20 results from an estimated 58 matches for "directios".

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2008 Jan 31
1
simulating directio on zfs?
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
2008 Dec 02
18
How to dig deeper
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("
2011 Oct 26
1
Re: ceph on btrfs [was Re: ceph on non-btrfs file systems]
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?
2009 Apr 20
6
simulating directio on zfs?
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%
2009 Aug 24
2
[RFC] Early look at btrfs directIO read code
This is my still-working-on-it code for btrfs directIO read. I''m posting it so people can see the progress being made on the project and can take an early shot at telling me this is just a bad idea and I''m crazy if they want to, or point out where I made some stupid mistake with btrfs core functions. The code is not complete and *NOT* ready for review or testing. I looked at
2004 Jul 08
0
directio for ext3 file system
Hi, Does anybody know whether the ext3 file system support Direct_io? if so, how do you enable it? I went through the man page of mount, and it did not mention such option? my system is running : Red Hat Enterprise Linux AS release 3 (Taroon Update 2) Kernel 2.4.21-15.ELsmp on an i686 Thanks much!!! David. __________________________________ Do you Yahoo!? Yahoo! Mail Address
2006 Oct 15
3
open(2) O_DIRECT on smbmount gives EINVAL
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
2010 Feb 19
3
samba file locking
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
2005 Dec 21
4
ZFS, COW, write(2), directIO...
Hi ZFS Team, I have a couple of questions... Assume that the maximum slab size that ZFS supports is x. (I am assuming there is a maximum.) An application does a (single) write(2) for 2x bytes. Does ZFS/COW guarantee that either all the 2x bytes are persistent or none at all? Consider a case where there is a panic after x bytes has gone to disk and the change propagated to the uber block. Do
2007 Feb 27
16
understanding zfs/thunoer "bottlenecks"?
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
2005 Sep 22
0
io provider and files in a forceddirectio mounted filesystem
The following script is used as a first attempt to discover IO patterns in a dbase setup: #------------------------------------------------------------------ #pragma D option dynvarsize=128m dtrace:::BEGIN { } pid$target::kaio:entry { self->doit = 1; } pid$target::_aiodone:return { self->doit = 0; } io:::start /self->doit || execname == "oracle"/ {
2013 Dec 02
2
lastes sources don't include "drop_cache" option
Was there some reason that patch got dropped? Otherwise rsync eats up all the buffer memory. Note -- I tried directio -- didn't work due to alignment issues -- buffers have to be aligned to sectors. The kernel, if I remember correctly, has been on again/off again on requiring alignment on directio -- because most of the drivers and devices do for directio to work, at. "dd"
2008 May 20
7
IO probes and 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
2007 Mar 01
1
data volume option, is it present in current version of ocfs2
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
2009 Feb 07
1
put the hostname of asterisk in the callerid uri to avoid NAT problems
...- Asterisk ip is 10.10.10.2 - SIP user view Asterisk as 10.10.15.2 (Asterisk is behind NAT) When the CCM calls the SIP user the call works perfectly. The problem is that the SIP user receives the call with this uri: <sip:xxx at 10.10.10.2> The call works properly and the audio goes in both directios, BUT if the SIP user does a redial (after the hangup) the call is forwarded to xxx at 10.10.10.2 that is the wrong address. I've tried to force SIP_HEADER(CONTACT) in the dialplan with a Set but it seems that i can't due to security reason. Is it possible to avoid this problem? Thanks -...
2012 Sep 13
1
Mounting DOSBOX on a remote share
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,
2010 Apr 30
1
Cannot mount Windows 7 share with CIFS Error 112 Host is down
Hi. I just got a new Windows 7 Home Edition computer and am unable to mount its shares on my Linux system. I'm running Fedora 11, samba 3.4.7 I have no trouble mounting shares from XP systems on the network using the mount command below. I can access the Windows 7 share with no problems using smbclient on Linux. The Windows 7 share is accessible from the XP systems. Here is the mount
2010 Feb 19
7
VT-d not working
Hello there, I am using a Gigabyte H55M-UD2H (Intel H55-Chipset) together with a Core-i5-650. According to Gigabyte Support the Mainboard does support VT-d. Well, actually support says, that VT-d does work on Windows-7 in XP-Mode. They do not test and support Linux though. Did anybody here have success using VT-d on any H55-Board? Perhaps it is some misconfiguration on my side. I tried a
2004 Mar 10
9
Lock contention issue with ocfs
I am still having this weird problem with nodes hanging while I'm running OCFS. I'm using OCFS 1.0.9-12 and RHAS 2.1 I've been working on tracking it down and here's what I've got so far: 1. I create a file from node 0. This succeeds; I can /bin/cat the file, append, edit, or whatever. 2. From node 1, I do an operation that accesses the DirNode (e.g. /bin/ls) 3. Node 0
2004 Mar 10
9
Lock contention issue with ocfs
I am still having this weird problem with nodes hanging while I'm running OCFS. I'm using OCFS 1.0.9-12 and RHAS 2.1 I've been working on tracking it down and here's what I've got so far: 1. I create a file from node 0. This succeeds; I can /bin/cat the file, append, edit, or whatever. 2. From node 1, I do an operation that accesses the DirNode (e.g. /bin/ls) 3. Node 0