similar to: O_DIRECT

Hello, I converted one of my servers to ext3 and load average numbers went up. Now they are ~2-3 while on ext2 LA was <0.4. And I'm constantly seeing processes and kjournald in D state. vmstat confirms that. But even in such LA CPUs are ~99% idle. What can be wrong? RedHat 7.1 kernel 2.4.18-18.7.xsmp. SCSI cards: Compaq RAID array controller (cciss) and Q Logic ISP1020 (isp_mod).

Hello, What is the simpliest way to run Redhat 7.3 server as CentOS 5 domU? I see that Xen emulates Intel PIIX ATA controller for HVM domUs but latest kernel of Redhat 7.3 (2.4.20-20.7smp) has no ata_piix kernel module yet. Is it possible to download it somewhere or there is another way? :) And I'd like to avoid reinstalling them with the new OS. Preferably they'd just die their

Hello, Is there some document about ext3 performance tuning and choosing the right type and size of journal? Except RedHat's white paper. From what I read I understood that for typical operations data=ordered is prefered. For the cases when there are many writes not appending to files data=journal is the choice. And if I want to get the most performance or in case where program is doing

Hello, We have long running problem with NetApp filers. When we connect server to the filer sequential read performance is ~70MB/s. But once we run database on the server seq read performance drops to ~11MB/s. That's happening with two servers. One is running Oracle another - MySQL. During speed tests database load is very light (less than 1MB/s of reads and writes). During the tests NetApp

Hello, What do you use to manage virtual Xen machines? Nothing complex though preferably. :) I've already converted some servers for a Xen dom0 and starting to loose the picture - which VM runs where and how much resources left on each server. Regards, Mindaugas

Hello everyone, I am learning and evaluating a glusterfs for film/video editing facilities. Some major film/video editing realtime applications are using the O_DIRECT file access for video/audio data files. The GLFS client via fuse mechanism is disallow the open file with O_DIRECT flag. I made a little sample code for read a file with O_DIRECT flag, and tried open the files on GLFS volumes. It

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

Hi We currently use rsync for various jobs at our company. We are now looking at using it to create an offsite synchonised copy of an Oracle 10g RAC archive logs area. The source area is on Oracle OCFS filesystem. The OCFS filesystem requires all reads/writes to be performed with the O_DIRECT option, thus bypassing cache. Oracle provide an updated coreutils package which includes the

Currently, default behavior of O_DIRECT writes was allowing concurrent writing among nodes, no cluster coherency guaranteed (no EX locks was taken), it hurts buffered reads on other nodes by reading stale data from cache. The new mount option introduce a chance to choose two different behaviors for O_DIRECT writes: * coherency=full, as the default value, will disallow concurrent

Hello, How to upgrade existing ext3 partition to new features? Moved from RHEL3 to RHEL4. I had to install from c0d0p6 so partition could not be reformated during install. Thanks, Mindaugas # dumpe2fs /dev/cciss/c0d0p1 | fgrep features dumpe2fs 1.35 (28-Feb-2004) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super # dumpe2fs

http://www.sample.banga.lt/crash.gif System - fully (except kernel) updated RedHat 7.3. Filesystems - ext3 in default ordered mode. What could be the cause of the crash? Kernel update will solve the problem? Thanks, Mindaugas

Hello, Maybe it's already FAQ but how to hide .journal file on rootfs? I upgraded filesystems on one of my servers from ext2 to ext3 and everything went smoothly. I'd like to avoid booting from alternative media because server is in production. FS update done together with server's kernel update. Thanks, Mindaugas

Hello, After some fiddling with the server now I have broken RAID1 with the "current" mirror on the disk with few unreadable sectors. If I try to re-add other disk to the mirror resync goes till those bad sectors and then starts from the beginning. And so on. Is it possible to somehow force resync to continue even after errors? Manual resync with dd would require a bit too long

In config file, ''*type=ioemu*'' is added with vif . Does it make the difference if we don''t add. Because i did not notice any difference in para as well as full virtulization. Same as in case of exporting the disk to Guest dom. Is it just a placeholder or else ? Second thing, I am running RHEL3 as a HVM DomU on xen-3.0.4. Every thing works fine, but i had a problem to

Another question. When my database is running, I do [oracle@LNCSTRTLDB03 LPTE3]$ cp --o_direct xdb01.dbf /tmp cp: cannot open `xdb01.dbf' for reading: Permission denied [oracle@LNCSTRTLDB03 LPTE3]$ When the database is shudown it works. Is this normal for ocfs because with any other filesystem I can just copy a file at any time (Its only a testing, I know I cant copy datafiles and have

It'd be pretty cool if rsync supported use of O_DIRECT on platforms that support it, with or without my odirect package: http://dcs.nac.uci.edu/~strombrg/odirect/ I say this because rsync is sometimes used to move a mountain of data, just once. So there's little point in rsync toasting one's buffer cache. I gather there's something like O_DIRECT on windows too, but it's

All, Long ago Xen added code to the device model to basically do an fsync() after every data write if the user in the guest specified that IDE write caching should be disabled. This works fine, except in the case where you are doing O_DIRECT writes inside the guest (ala dd if=/dev/zero of=/dev/hdb oflag=direct). This is because you can get out of ide_write_dma_cb() in the middle of the loop

https://bugzilla.samba.org/show_bug.cgi?id=7876 Summary: please implement o_direct Product: rsync Version: 3.1.0 Platform: Other OS/Version: Linux Status: NEW Severity: normal Priority: P3 Component: core AssignedTo: wayned at samba.org ReportedBy: costinel at gmail.com QAContact:

Hello, I was asked if it is possible to zero unused space in ext3 partition? Users write to the server via Samba and are far from computer geeks so teaching them to use some safedelete utility is quite impossible. Is there some way or utility to wipe out all the data from unused space? Thanks, Mindaugas

Hello, I was asked if it is possible to zero unused space in ext3 partition? Users write to the server via Samba and are far from computer geeks so teaching them to use some safedelete utility is quite impossible. Is there some way or utility to wipe out all the data from unused space? Thanks, Mindaugas