similar to: dual-ported raid

>> What I would like to do is use one >> normally, and mount the second system read-only to perform backups and >> to rsync the filesystem to another filesystem. When it's mounted >> read-write from another system, will mounting the same filesystem >> read-only cause the journal to be committed at the time it's mounted? > >Yes, that is very bad. Can you

My application always needs to sync file data after writing. I don't want anything handing around in the kernel buffers. I am wondering what is the best method to accomplish this. 1. Do I use EXT2 and use fdatasync() or fsync()? 2. Do I use EXT2 and mount with the "sync" option? 3. Do I use EXT2 and use the O_DIRECT flag on open()? 4. Do I use EXT3 in full journaled mode,

Hi, After mounting -t ext2 an ext3 partition, working with, do I have to recreate .journal when I remount the partition as ext3 ? Thanks ! Liu

Hello, I'm writing an application that makes pretty extensive use of extended attributes to store file attributes on Ext2. I used a profiling tool developed by my colleague Nikolai Joukov at SUNY Stony Brook to dig a bit deeper into the performance of my application. In the course of my benchmark, there are 54247 setxattr operations during a 54 seconds. They use about 10.56 seconds of the

I'm setting up a new file server and I just can't seem to get the expected performance from ext3. Unfortunately I'm stuck with ext3 due to my use of Lustre. So I'm hoping you dear readers will send me some tips for increasing ext3 performance. The system is using an Areca hardware raid controller with 5 7200RPM SATA disks. The RAID controller has 128MB of cache and the disks

Hi there, I tried to setup my linux box with an ext3 root file system. That failed because of wrong initrd settings. Sorry. Now the filesystem is marked having a journal but there is no /.journal file anyway. I tried to buikd that journal by hand (tune2fs -j /dev/hda3 - in my case). That fails also. :-( /sbin/tune2fs -l /dev/hda3 says: ... Journal UUID: <none> Journal

Hi! Are these results i got from my benchmarking "normal" or is there something strange happening in my system? This box is going to be a mailserver, so i tested various fs to decide on which i should utilize. I personally dislike reiserfs because it has proven somehow unreliable on our servers (although it got better in the more recent kernels), ext3 would be quite good (fsck'ing

Hello, I have a production script that do read operations to a lot of small files. I read that one can gain performance boost with small files by using a loop device on top of Lustre. So a created 500 GB file striped across all of my OSTs(which are 8). I formatted the file with ext2 fs, and mounted it on a client. Just for the sake of testing a simple bash script finds all files with a given file

Hi I have a Firewire connected Micronet 1.5TB RAID with a single large ext3 filesystem on one partition on a dual Xeon system. I am checking out from an extremely large cvs repository (don't ask) to this drive over the course of many days, and intermittently I get bad blocks and the filesystem goes read-only. This is not related to any power failure or anything similar. The RAID is currently

Consider this section: http://www.tldp.org/HOWTO/Software-RAID-HOWTO-4.html#ss4.14 I have not done this before and I'm leary about Step 11 which is resizing the filesystem after doing a mkraid command. This howto lacks any ext3 documentation. Some questions I have are: 1. Should I convert back to ext2 on all my filesystems before I do a mkraid? 2. If I leave the system at ext3, will the

Hi! Is there a way to view ext3 filesystem's maintained journal (in a human-readable-format)? I ask, because i have had a server crash before and now i'm wondering if i might take a look at last things that my server did straight before crash. I guess clarifying log insertions might be lost before buffers were flushed to disk. Thx.

Hi all, I want to setup a RAID storage system, where i have two systems connected to it. the filesystems are mapped out to both connectors. I want the master host mount them read write, and the slave read only. in my fstab on the slave I have a line like the following: /dev/sdb1 /mount ext3 acl,noauto,user_xattr,nosuid,ro 0 0 so in man 5 fstab, it is written, that when the 6. field

I am running postfix on RH machine. decided to upgrade one of my machines from 7.1 to 7.2 - performance drop of 75 percent !!!!! moved back to ext2(remount partition as ext2) - performance is back. on the 7.1 upgraded to ext3 (only the disks), rebooted - performance drop of 70 percent... used a 2.4.17 kernel compiled by myself - a little faster then the last RH kernel, but still runs at third

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I created all my ext3 partitions a while back, so the journal.dat file is visable. I'd like to remove them and use the new tune2fs functionality. Can I just mount the drives as ext2, rm journal.dat, tune2fs -j /dev/hd?? and then remount as ext3? Or am I missing something? thanks! - -- Douglas J. Hunley (Linux User #174778)

All -- I'm curious is if it safe or even wise to run the following command on a mounted filesystem, namely root (/)? tune2fs -j /dev/hda1 What about if someone goes into single user mode and runs this first? mount -o remount,ro / And then to enable it, runs this? mount -t ext2 -o remount,rw / I assume it is not safe to do so, but one user in my LUG assumes otherwise. Just curious,

Hi, Is it possible to use a separate journal device (one on a separate drive or a partition) shared among more than 1 Ext3 file systems ? I appreciate any inputs. thanks, Vijayan

My UPS failed and my server took an 'unscheduled outage' a few weeks ago. The only casualty appears to be a volume I used for backup. I usually maintain data on multiple hard disks, but in this case I errantly had some data (of marginal value) on this file system. At this point, the data is not worth enough for me to send the drive out for data recovery, but it's worth enough to

Hi, I noticed that some of my ext3 partitions have a lost+found directory and some do not. Which is correct? mke2fs -j makes the lost+found but after a fresh install of 7.2 there are no lost+found on partitions that were formatted. I want to make them all the same but I am not sure which is correct. I do not plan on going back to ext2 but......... -- ......Tom Dysfunction The Only Consistent

We are having problems remounting an ext3 filesystem using an external journal device. The filesystem in question was working fine until the server was rebooted. This is what we see on dmesg when trying to mount: EXT3: failed to claim external journal device. The external journal lives on a LVM2 logical volume and it seems to be accessible ( we can dumpe2fs and see filesystem information).

After a rather severe hard boot, my machine refuses to mount homes, which are on an ext3 partition. Here is the error i get while mounting... # mount /dev/sdc1 EXT3-fs: invalid journal inode EXT3-fs: get root inode failed mount: wrong fs type, bad option, bad superblock on /dev/sdc1, or too many mounted filesystems However I am able to mount it as ext2 and continue. I am using ext3-0.0.6b on