General :: NFS FS Mounted With 'noac' Is Too Slow?
Sep 27, 2010
This may be to specific of a scenario, but it is real.- I use an NFS mounted FS as a destination for my backups from multiple clients. - If the FS is mounted with 'noac' which in effect disables write caching, backup performance is horrible 40kb/sec.- If I remove this mount option, backup performance is fine 12mb/sec. However, because of write caching, my cpu io wait time increases (up to 40%) and performancen the entire host suffers unacceptably.My initial impression/solution is to find a way to enabling write caching e.g. do not specify 'noac' and limit OS write cache size
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May 2, 2010
I have a Hitachi SimpleNET adapter (entry-level NAS device) on a Seagate FreeAgent 1TB external HDD (formatted ext3). The NAS device is connected over 100MB/s ethernet to a Netgear Wireless G router. All other devices connect using Wireless G. The NAS runs embedded Linux on an ARM processor and it runs vsftpd and Samba for file transfers.
If I transfer a large file using an FTP client the transfer maxes out at around 2.5MB/s. For my purposes that's good enough, especially considering the Wireless G bottleneck. If I transfer a file from a Windows 7 client (using samba) I get around 2.2MB/s. I know the CIFS protocol has more overhead than FTP and the difference in speed isn't that noticeable.Any combination of Ubuntu and Samba results in me getting less than 1MB/s. I've tried mounting it through Nautilus (GVFS) and /etc/fstab. FTP from this same Ubuntu client gets around 2.5MB/s.
I don't have root access on the SimpleNET to change the smb.conf. I've made a few adjustments to the mount options with no success. how to either speed up 10.04 as a Samba client or mount a folder on an FTP server locally? I've tried both curlftpfs and FUSEFTP. With curlftpfs any write operation results in an I/O error and it crashes intermittently. With FUSEFTP I never got that far and couldn't even browse the folder.
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Jan 14, 2010
The shares get mounted correctly and you can navigate through the directories and open files.The only problem is that it randomly starts going really slow taking 30 seconds or longer to open a directory that has 2 or 3 files in it.I have tried quite a few things to try and fix this without any luck. Its getting to the point where I am having to consider recommending that we use windows instead, which I would rather not do as I think its good for students to experience different operating systems during school.
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Feb 4, 2011
my mounted drives open slow with ubuntu 10.10 and 10.04.it does this with all boxes i have installed 10.10 or 10.04.it doesn't do this with 9.10 or before.it doesn't matter if it's USB drives or partitions on the same drive as the OS or flash drives.if time has gone by when i last opened the mounted drive/partition it won't open.it's like they go to sleep and then have to be woke up again.the checkbox in the screensaver settings that says "spin down hard disks when possible" is not checked off sometimes i have to click the mounted drive icon 2 or 3 times to get it to do anything and open the mounted drive.it doesn't matter what the file system type is either. i checked the mouse click settings and played around with them.power management settings are set to "never" spin down.i am using standard ubuntu desktop on all scenarios.
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Jan 11, 2010
I have good experience in microsoft enviroment, now tiring to use linux, i tried Ubuntu 9.10, OpenSuse on different computers bur there is same big problem: Very slow download speed compared to microsoft.same file at same time downloaded by microsoft winxp toke incomparable short time. for example file 5.5MB attached to e-mail on Yahoo toke ~1minute to download on winxp computer,same file at same computer but with Ubuntu takes more thane 30minutes!
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Mar 2, 2010
Recently I was trying out a boot disk I had made, and basically, I switched it off several times due to it booting the completely wrong kernel. Now, I'm getting to the stage "Checking File systems" and then comes up [Failed]. I then get a message saying Reboot required, and that it will reboot in 15 seconds, just a few seconds before it reboots I get "/dev/shm not mounted, /dev busy" or something similar.
I've booted up my sysresccd, ran "fsck.ext4 -fcv /dev/sda2" to force a check and scan for any bad blocks, it came up clean, then I rebooted and got the same error, so I copied the kernel and system.map over to /boot to make sure there's no corruption and reinstalled initscripts and util-linux-ng, rebooted, same error.Tried different kernels, I've checked fstab and menu.lst, no problems there, so I still don't get why I still get the same problem.
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Feb 2, 2010
The Fat32 master HDD in my Intrepid Ibex 8.04 Ubuntu PC is mounted and stays so.
I installed a second (slave) ntfs HDD into the Ubuntu PC. Each time I turn it on, the drive needs to be mounted.
What (exact steps) do I need to do so that the slave drive stays mounted after the PC is turned off.
The goal: When the PC is turned on, I'd like the slave HDD already mounted and ready to use.
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Jan 13, 2010
I have an NFS server running an older version of AIX that exports two disk partitions. Let's say /1 and /2I also have an NFS client running Fedora 9.I am able to NFS mount /1 and /2 from NFS server under /mnt/1 and /mnt/2 on the client.If I do a df command on the aix server,I see that /1 is 2Gb total and 1.7Gb is usedand /2 is 2Gb total and 1.4Gb is usedI see the same if I do a df command on the NFS client (Linux)Now, the confusing part is here: in the GUI of Fedora, if I go under /mnt and right click on /1 and check folder properties, it tells me that there is ~ 54 000 files (which i assume is the correct number) for a total of 5.3Gb! And for /2, properties indicate 1.2Gb. Where do these extra 3.6 Gb come from on /1...? and even the smaller difference for /2 confuses me (but this might be just the way different systems round off large numbers)?
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Apr 20, 2010
I recently formatted my hard drive and installed Ubuntu and I have the following problem: My laptop has to inbuilt hard drives, one which I use for the operating system and one which I use for storage. Up until 3 days ago, I had Windows XP and Ubuntu 8.04 installed on one of the hard drives, but decided to switch fully to Ubuntu 9 because Windows was giving me far too many issues. So I downloaded the ISO, burned it on CD and then installed. I formatted (as far as I could tell) only one drive but the other one has disappeared from view ever since. I asked a more Linux savvy friend of mine for help and he only got as far as determining that the 2nd HDD is still detected but not mounted. And then he referred me here.
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May 9, 2011
how can i check from console where folders are mounted?
i want to be able to check what partitions certain folders are on.
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Jul 15, 2010
I get this pop-up error message whenever I plug it in or try to open it via my file manager:
Quote:
Failed to mount "16G Removable Volume".
Rejected send message, 1 matched rules; type="method_call", sender=":1.81" (uid=1165 pid=4087 comm="exo-mount -n -h /org/freedesktop/Hal/devices/volum") interface="org.freedesktop.Hal.Device.Volume" member="Mount" error name="(unset)" requested_reply=0 destination="org.freedesktop.Hal" (uid=0 pid=3003 comm="/usr/sbin/hald --daemon=yes ")).
[Code].....
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Apr 16, 2011
New vps with fedora 13
my fstab
none/dev/pts devptsrw00
tmpfs /dev/shm tmpfs defaults 0 0
first one works
tmpfs doesn't get mounted....
can't figure out why =
worked on fedora 10...
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Mar 10, 2010
I recently installed kde using
Code:
apt-get install kubuntu-desktop
and I love it. However, in GNOME, it shows all the usb drives and cds you have in on the desktop. The kde desktop doesn't do this, and I'm wondering if there's a way to make it so. I googled around, but couldn't find anything.
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Jul 6, 2010
I'm using LVM-based partitioning. I can not mount one partition. Here is some information I can provide.
Untitled-1.png
snapshot7.png
snapshot8.png
This incident happened after I try to encrypt this partition and then an error message appears. If not mistaken, it contains an error number (I forget) and a warning which reads that can not remove the LABEL on the devices.
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May 26, 2011
Created partitions, some of them LVM, in a server, say A. Did the same for another server, B, but created one more LVM partition.
Installed RHEL in A, and some other applications. Made dump files for each partition of A and restored all of them them in B. No error in that process, except B wouldn't boot. Did chroot /mnt/sysimage and grub-install /dev/sda--still no good. B came to a halt with GRUB> dispalyed. <tried many things many times.. searching Googles..but w/o luck) Gave up, and restored the bootloader part using OS CD -- I say restored because now B boots ok and I can see application that I had installed in A. So far so good.
Problem: that extra LVM partition is missing! I did not knowingly overwrite it, so where did it go? Somebody is keeping it from being displayed!
Is it the grub.conf that tells the OS what to mount and what not to? If yes, problem is , grub.conf is missing in B. In A, it is in /boot/grub/. df -kh shows other partions (some of them LVM) just fine.. what is going on?
I tracked a file called menu.lst in a strange place, in /usr/share/doc/grub-0.97.. but I didn't see any entry that loads partitions.
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Feb 26, 2010
I run Windows Vista and Ubuntu 9.10 dual boot. Today while booting windows, it informed me that there was something wrong with my hard disk and it would perform a check, and made some fixes.
Only when I wanted to boot into ubuntu again did I realise that the disk check had corrupted my linux partition. Ubuntu's load screen shows up, but just before the login screen it says that the filesystem could not be mounted.
Is there a way I can fix this? And how do I prevent windows from doing the same in the future?
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Jun 15, 2010
I want to find out the last time a filesystem was mounted on Linux (Debian).
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Jul 22, 2011
How can I see all the physical hard drives on my Ubuntu system — regardless of whether they're mounted — as well as their partition info, sizes, &c.? I have three physical drives, but only one seems to be mounted. I'd like to mount the other ones too, as I have some data on them.
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Sep 8, 2011
I wanted to set ACL for a directory. For that it is important that the device should be mounted as acl on that directory.
But I do not want to add the acl mount in /etc/fstab. So I am tempoararily mounting the device to some temporary directory as acl and setting ACL and then unmounting it. Then, I'm mounting it to the original directory.
The code is below:
tmp="/tmp1/backup"
orig="/mnt1/backup"
dev="/dev/sda2"
mkdir -p $tmp
[Code]....
The group is being changed, but ACL is not set for the directory.
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Nov 12, 2010
I want the filesystem of my external drive to be checked periodically after a numer of mounts. I put 2 in the sixth colums of fstab for this partition
Code:
/dev/sdb1/mnt/hdext3rw,dev,sync,user,noauto,exec,suid02
and I use the tune2fs to set the maximum mount count to 32.
Code:
tune2fs -c 32 /dev/sdb
now the mount count is 34 and the date of the last check is not recent, so apparently the auto fsck has not been performed. Probably because this partition is not mounted at start-up but I usually mount it manually.
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Feb 1, 2011
Every time I mount one partition manually as read write it works fine for a couple of minutes before reverting to read only. It still appears as read-write when I list the mounted directories but won't let me write to it. I have tried unmounting and remounting it, but after a few minutes it always ends up as read-only again.
$ mount
/dev/sda3 on /scratch type ext3 (rw)
$ mkdir /scratch/file
[code]...
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Jun 6, 2011
I am sharing directories using NFS.so one machine mounted those locations (Server). so i need to get what are the machine which successfully mounted (IP address of mounted locations). At the boot time server mount the remote location.but i want to get what are the successfully mounted location into text file.
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Mar 20, 2010
i need to check if a cd is mounted or not using bash ... how is that possible?
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Jul 13, 2010
I've tried googling for an answer to my probably extremely easy question, but since I'm a complete beginner I just do not understand whatever I find.Same goes for the whole linux wiki. After many frustrations with Windows I've been trying unsuccessfully to get any version of Linux to try out. However, I always get stuck at the same point: downloading the version works fine, but then getting it to work! Then I get frustrated with Linux for being too complex for the quite computer savvy in Windows, but not a programmer, person. And I returned to Windows. Repeat every 2 months.
So now I am here, please do not start talking to me as if I understand words like kernel - that's where I get stuck.What have I done:
- working in Win7 (illegal version, since I have a netbook and legal downloads are not available in the NL yet)
- found and downloaded the 2 puppylinux files named lupu-500 and lupu_devx_500
- used Virtual Clonedrive to mount both files; looks like I have drive F: being recognized as a dvd-rom drive and drive G: named BD-rom drive.
- I double click either one to open and I get: "Windows can't access this disk, etc." for F: or for G: "Please insert a disk, etc"
I know this is a long post, but please help me or you're losing me to Microsoft again!
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Dec 30, 2010
I have installed Ubuntu server 10.10 today and I am trying to mount the scsi cdrom drive in a Dell Poweredge 2850. I can see the device in dev listed as scd0, but when i try to mount it to /media/cdrom or /mnt/cdrom I get a long list of I/O errors: Buffer I/O error on device sr0.
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Mar 2, 2010
I have a Fedora 12 system. Having some boot problems here and I booted up my Fedora 12 live CD to troubleshoot it. My boot problem is I get to this message: Registering binary handler for windows applications: Then the screen flashes a few times and enternal hang begins. I installed wine before the reboot. I cannot figure out where my HD (which is sata btw) is after liveCD bootup. I figured I could turn wine off some how. Is it in rc.d or init.d? Anyhow here is my mount info from terminal.
[root@localhost liveuser]# mount
/dev/mapper/live-rw on / type ext4 (rw,noatime)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
[code]....
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Feb 22, 2010
I have a game .iso for windows. When I run it with Wine 1.01 it says to insert disk into cdrom. I used
Code:
mount -o loop -t iso9660 Zanzarah.iso /mnt/cdrom
but the game still asks for the disk.I also tried to find nocd, but couldn't find any for my version.
I mean can I make it see the .iso as a disk like it happens when one uses Daemon Tools with windows or somehow else?
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Mar 2, 2010
I have a Node mounted from my Appserver (Solaris) to DBserver (Solaris), the reason why I Mount is that My Oracle writes file using UTIL_File in Dbserver only, so now I done the Mount and I can create file using VI in the Mounted point. But My UTIL_file is not able to create a file, the reason might be that Oracle writes only as ORA user and my Appserver has no such user, for that I have given the permission 777 for that particular folder, but no use, so I wonder do I need additional permission for this.
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Oct 26, 2010
I have two servers, 82 and 70.My exports file on 82 reads /...70(rw)on 70 I have a mountpoint called mnt_for_82I execute on 70mount -t nfs -o rw ...82:/ mnt_for_82I go to server 70 and indeed can read and travers the mounted subdirectories. However, I try to create a file or subdirectory under the mount point on 70 and I get a *Permission Denied* error.I'm sure there is a simple explanation for this issue as well as a correct nomenclature for what I'm trying to do in nfs
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Jul 1, 2011
The why behind this is a little long winded so let me get to the technical question. I have a 16 GB SD card in my netbook as additional storage to the 16 GB SSD drive. The SD card is formatted fat32 (by a utility from sdcard.org which is supposed to and does make the card read and write faster than if it was formatted by the OS). The card mounts when I login to the netbook. The entry from mtab shows
Quote:
/dev/sdb1 /media/SD16 vfat rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,flush 0 0
If I look at the permissions on SD16 I find
Quote:
ken@taylor13:/media$ ls -l
drwx------ 3 ken ken 32768 1969-12-31 19:00 SD16
sudo chmod 777 SD16 does not change the permissions.
The problem is I need to connect to the machine with a different user (due to a security hole in gnome-commander). As the card is formatted fat I cannot assign group permissions to it and my second user cannot access it.
I had previously had the card formatted as ext3 and it was so slow as to be unusable. It needs to be formatted fat. I am stumped.
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