similar to: Limited write bandwidth from ext3

All, I'm requesting comments from the expert readers of ext3-users on these notes for tuning ext3 for performance. Most helpful would be feedback pertinent to RHEL 5; as XFS isn't supported under Red Hat Enterprise Linux these items are an attempt to match XFS performance with ext3. These items were culled from a number of sources. Will they be effective for achieving the performance

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,

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 I have written a small introduction to newbies in Danish on ssh and friends. Now some people are questioning my advice and I think they have a point. I am advocating people to use DSA-keys and a config file with this: Protocol 2 ForwardAgent yes ForwardX11 yes Compression yes CompressionLevel 9 and running ssh-agent and ssh-add, and then loggin in without giving keys. One

Hi I have a problem with lm and predict I have us [1] 2789.53 3128.43 3255.03 3536.68 3933.18 4220.25 4462.83 4739.48 [9] 5103.75 5484.35 5803.08 5995.93 6337.75 6657.40 7072.23 7397.65 [17] 7816.83 8304.33 8746.98 9268.43 9816.98 10127.95 10469.60 10960.75 [25] 11685.93 12433.93 13194.70 13843.83 us.p [1] 227.62 229.92 232.13 234.25 236.31 238.42 240.59 242.75 244.97

Hi I would like to sum a number of time series, some of them having NA's Standard action is here that if I sum a value with a NA, then the result is NA. I would like it to just keep the value. I then try to: a = NA; if (a == NA) { a = 0} just to try it out, but it says Error in if (a == NA) { : missing value where TRUE/FALSE needed What is wrong, and can I do it smarter? I looked at

(The list appears to have eaten my previous attempt to send this. Apologies if you receive multiple copies.) The attached patches allow you to use paravirtualised network and block interfaces from fully virtualised domains, based on Intel''s patches from a few months ago. These are significantly faster than the equivalent ioemu devices, sometimes by more than an order of magnitude.

Hi all. I was doing some testing with writing out data to a BTFS filesystem with the compress-force option. With 1 program running, I saw btfs-delalloc taking about 1 CPU worth of time, much as could be expected. I then started up 2 programs at the same time, writing data to the BTRFS volume. btrfs-delalloc still only used 1 CPU worth of time. Is btrfs-delalloc threaded, to where it can use

Hi I got a strange error, happening on two of my ext3 partitions. What can be wrong? And why does e2fsck error out, instead of displaying an error message? Best regards keld fsck /dev/hda6 fsck 1.38 (30-Jun-2005) e2fsck 1.38 (30-Jun-2005) Warning... fsck.ext3 for device /dev/hda6 exited with signal 11. also From my dmesg: <1>general protection fault: e7a8 [#3] Modules linked in:

I often get the message: EXT2-fs warning (device hda6): ext2_fill_super: mounting ext3 filesystem as ext2 I have googled for a reason and a way to solve this - but not found something I could use. Maybe somebody here konws what to do? best regards keld

Greetings all, I see the following issue during snap creation under IO: Transaction commit calls btrfs_start_delalloc_inodes() that locks the delalloc_inodes list, fetches the first inode, unlocks the list, triggers btrfs_alloc_delalloc_work/btrfs_queue_worker for this inode and then locks the list again. Then it checks the head of the list again. In my case, this is always exactly the same

Liu fixed part of this problem and unfortunately I steered him in slightly the wrong direction and so didn''t completely fix the problem. The problem is we limit the size of the delalloc range we are looking for to max bytes and then we try to lock that range. If we fail to lock the pages in that range we will shrink the max bytes to a single page and re loop. However if our first page

Hi! I had problem yesterday with e2fsck. It reported a bad superblock. I then tried to use one of the other superblocks. To no avail. Then later I remembered that I had switched the fs type to xfs. Maybe e2fsck could recognize other common fs types, and report this instead? best regards keld

Hello, We have run and stopped by chance command "fsck -y" on one of our raid disks (with ext3 file system). After that we have found that SOME files disappeared (they are not seen in the directories where they have been before). The data are extremely important and contain a lot of programs, scripts for some data analysis and very hard to recover by hands. I have run ''fsck

Hi! I am using rsync succesfully to maintain my mirrors. I have one problem, tho. To improve speeds of my filesystems, I have created a raid 0 of 4 disks, and I place the most heavily copied disks there. The fs has subdirectories, one for each set of typically .iso files, such as Mandrakelinux or fedora. I would like to be able to just do a symlink from the original tree to the directory on the

Hi, I could not find this anywhere else reported, so here we go: creating a new btrfs filesystem (btrfs-progs-unstable from git) and mounting it succeeds, unmounting however fails with the kernel messages attached to this mail. After that, I can still read and write to the btrfs mount, but e.g. /bin/sync never finishes, sysrq-s never reports "Sync complete". I''m using a

Hello all. What we have: SL6 - kernel 2.6.32-131.2.1.el6.x86_64 btrfs on mdadm RAID5 with 8 HDD - 27T partition. I see this at top: 1182 root 20 0 0 0 0 R 100.0 0.0 16:39.73 [btrfs-delalloc-] And LA is grow. What is this and how can I fix it? -- Best regards, Proskurin Kirill -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of

Hi, I wantto use 'mle' function in R on linux. As I see its been integrated into the stats4 package. Am I correct ? If yes, Can anyone suggest how to install the stats4 package to be able to run 'mle' function in R on linux ? Otherwise how to sort out this problem ? Thanks Himanshu [[alternative HTML version deleted]]

Hi, I get the following error when I try to mount lustre on the clients. Permanent disk data: Target: lustre-OSTffff Index: unassigned Lustre FS: lustre Mount type: ldiskfs Flags: 0x72 (OST needs_index first_time update ) Persistent mount opts: errors=remount-ro,extents,mballoc Parameters: mgsnode=164.107.119.231 at tcp sh: losetup: command not found mkfs.lustre: error 32512 on losetup:

Dear friends: I am a new R user, and not very good at statistics and maths I find it difficult to find the minimum of this item: ((p*(b-1)-1)*(p+1)^(b-1)+1)/p^2 It seems that the method optim can find the minimum. I tried several times , but R constanly tells that " failure to find b or p" Would you please give some suggestions? Thanks in advance. Best