Looking at the output of a cat /proc/mdstat, how do i know what volumes its actually resyncing? when i do a df -h everything appears to be there.
Personalities : [raid1]
read_ahead 1024 sectors
Event: 2
md0 : active raid1 sdb1[1] sda1[0]
859549696 blocks [2/2] [UU]
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I have a desktop server set up with 3 x 1Tb disks set up in a number of partitions. Some are under RAID 1, others under RAID 5. eg:
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md0 : active raid1 sdc2[2](S) sdb2[1] sda2[0]
513984 blocks [2/2] [UU]
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I've got the F13 LiveCD that I was able to boot and use using the "nomodeset" boot option. From the desktop I'm trying to perform an Install to Hard Drive. I've read the Install from LiveCD post regarding the creation of a /boot partition and a / root partition. I've tried creating them without the LVM group and with. But every time I appempt to install I get...
An error occurred mounting device proc as /proc: mount failed: (9, None). This is a fatal error and the install cannot continue.
Hardware is a Sager 8887 (P4, 3.06HT, 60GB HDD, Radeon 9000 graphics adapter)
Is it possible to partition an LVM in two volumes. So that one can be an ext4 filesystem and another can be swap.
View 6 Replies View RelatedI have been asked to use space allocated to /dev/sdb2 to grow /dev/sdb1 both filesystems contain data. When I run lvdisplay or vgdisplay I get "no volume groups found". and pvdisplay returns nothing. Do I need to add the fs to a group?
View 2 Replies View RelatedAre there any maximum amount of logical volumes a LVM2 volume group can contain?
View 1 Replies View RelatedJust installed a new CentOS with the control panel Interworx. Everything fine, BUT. I can't add new ipadresses cause there is no network device.When i do 'ifconfig' i get the following:
[root@cobra ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:1C:C0:A7:25:9F
inet addr: Bcast: Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
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I'm using munin to monitor our servers. Recently I created additional partitions on one of them and I noticed that munin has not picked up the changes.
I restarted munin-node and running the plugin manually as user munin on the machine
Code:
$ munin-run df
I get all my partitions
Also when I telnet 10.1.1.25 4949 and run
Code:
fetch df
I'm getting all of them. The graph however displays only the ones that were there at the time of munin install.
How can I get munin to add the new partitions to the graph ?
I'm setting up two media servers - one will be primary and the second will be the failover box if the first one dies. My original plan was to use Heartbeat and DRBD to replicate the first to the second, but it turns out DRBD has a limitation of 16TB per volume, and my RAID 6 is 30TB in size. I'm trying to figure out some options.
One is to split the partition into two, so it's under the 16TB limit of DRBD, share both partitions, and then use LVM to join them as a single volume at the OS level. I'm not sure what kind of performance hit that will make on read/write access since now it will need to go through LVM *and* DRBD.
Two is to use something like GlusterFS or XtreemFS. However, I am wary of both of those as the first is a FUSE-based system and isn't really tuned for performance, and XtreemFS is still kind of beta-ish.
Three is good old rsync, but that is a bit too asynchronous in my opinion. I'd like to be able to fail over virtually instantly and not lose any content.This is a production system and performance of the disk systems are paramount, followed by reliability.
I have a script that needs to extract certain information form the /proc/net/ip_conntrack file once in a while. I do not wish to run this script as the root user.
Default permissions for the file is:
I can change it with:
But that does not stick after a reboot. Is there some configuration file for file-permissions in the /proc directory in Ubuntu Server 9.10? Or do I just have to stick a chmod line in some startup script?
I'm trying to make a fresh install of Ubuntu 10.10 Server 64bit but is stuck with the Partitioning Disk part and Ubuntu 10.04 LTS provides the same error. The installation wizard gives me a menu:
!! Partitioning disks
This menu allows you to configure iSCSI volumes
iSCSI configuration actions
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So, the NSA puts out some handy documentation on locking down a RHEL server (running centos 5.6 x64 myself) here, [url]. Under "Ensure System is Not Acting as a Network Sniffer" on page 63, it says that if any numbers below the first line in /proc/net/packet, that it is acting as a network sniffer.
I get the following output:
Code:
Unless I've been pwned, I don't know exactly what could be causing this. Besides samba, nmap (compiled from source, not from yum), screen, and rtorrent, there's nothing I've installed beyond the fresh install I did a few days ago. I was not running nmap when looking at /proc/net/packet.
We have a Centos 5.6 server mounting two iSCSI volumes from an HP P2000 storage array. Multipathd is also running, and this has been working well for the few months we have been using it. The two volumes presented to the server were created in LVM, and worked without problem.We had a requirement to reboot the server, and now the iSCSI volumes will no longer mount. From what I can tell, the iSCSI connection is working ok, as I can see the correct sessions, and if I run 'fdisk -l' I can see the iSCSI block devices, but the O/S isn't seeing the filesystems. Any LVM command does not show the volumes at all, and 'vgchange -a y' only lists the local boot volume, not the iSCSI volumes. My concern is that, the output of 'fdisk -l' says 'Disk /dev/xxx doesn't contain a valid partition table' for all the iSCSI devices. Research shows that performing the vgchange -a y command should automatically mount any VG's that aren't showing, but it doesn't work.
There's a lot of data on these iSCSI volumes, and I'm no LVM expert. I've read that some have had problems where LVM starts before iSCSI and things get a bit messed up, but I don't know if this is the case here (I can't tell), but if there's a way of switching this round that might help, I'm prepared to give it a go.There was absolutely no indication there were any problems with these volumes, so corruption is highly unlikely.
what the maximum number of logical volumes is for a volume group in LVM ? Is there any known performance hit for creating a large number of small logical volumes vs a small number of large volumes ?
View 1 Replies View RelatedI installed Debian on my NAS and I installed nfs to share the files, but I cannot mount anything over nfs with the it. it seems that I dont get the exports right.I added the IP to the hosts.allow, I added it to the exports.to make it easier, shananigen has the IP 192.168.10.33 and is the serverdebian has the IP 192.168.1.34 and is the clientis there a problem if I go across subnets?anyway, here we go
shananigen:/etc# cat exports
#
/home/gerard 192.168.1.34(rw,sync,no_subtree_check,root_squash)
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I am trying to use eciadsl in ubuntu 10.10 in order to connect my Prolink H9601 USB ADSL modem(Conexant based) to the internet.eciadsl worked to some extent in ubuntu 9.10 but in ubuntu 10.10 it returns [EciAdsl 1/5] Setting up USB support...
I presume this is because ubuntu 10.10 does not mount USB device filesytem (usbfs) in /proc/bus/usb folder and i can't manually create this folder therefore making it impossible to mount usbfs manually into this folder.
the difference between /proc and /sys? Also, When enabling public-key authentication using SSH, what file on the remote machine must be modified and how?
View 1 Replies View RelatedI have done a recent install of Debian squeeze on a laptop. I set up LVM with 3 LV's, one for the root filesystem, one for /home, and another for swap. I then used lvextend to increase the size of the LV's. This additional space is shown if I enter lvdisplay (shortened for clarity):
- Logical volume -
LV Name /dev/auriga/swap
LV Size 4.66 GiB
- Logical volume -
LV Name /dev/auriga/root
LV Size 15.97 GiB
- Logical volume -
LV Name /dev/auriga/home
LV Size 169.01 GiB
However, if I use df, it still shows the previous size.
/dev/mapper/auriga-root 14G 8.0G 5.2G 61% /
/dev/sda1 221M 16M 193M 8% /boot
/dev/mapper/auriga-home 147G 421M 139G 1% /home
I have even tried restarting as well. I do not understand why df would still show that /home is 147GB, when I extended it to 169GB using lvextend. Similarly for the root, which was extended by 2GB from 14GB to 16GB.
I was finally upgrading from F12 to F14, and as you'd expect from someone posting for the first time here, I did something stupid. My system has two drives set up as RAID-1 with LVM for the entirety of them. I added a new drive to use as the boot & OS drive, but during the install process I believe I somehow managed to wipe the LVM information from the RAIDed drives (though I did not install to them or format them).
While I have a working F14 install on the new drive, I would like to get access to the data I have on the RAID. However, the LVM tools show the RAID drives as uninitialized. If I try booting off the RAID, it gets partway through the bootup (the white part of the progress bar gets about halfway) before displaying "No root device found. Boot failed, sleeping forever." This occurs regardless of whether I have the new drive plugged in or not. I've been googling for the past several hours and haven't found anything that allows me to access the the volumes on the RAIDed drives.
What is the difference between a Partition and a Volume in Redhat Linux 5?
View 2 Replies View RelatedI know many apps have their own independent volume controls, but not all do. Is there any way to control this in a similar manner as Windows 7?
View 4 Replies View RelatedFirst Question: I have a very big volume (20+TB). When I try formatting it as ext4, I get the error message:
mke2fs 1.41.12 (17-May-2010) mkfs.ext4: Size of device /dev/sdc1 too big to be expressed in 32 bits using a blocksize of 4096. I understand that ext4 has a limit of 1EB (about a million terabytes), but a 32-bit limitation in e2fsprogs prevents me from creating a partition > 16TB.
Until e2fsprogs is updated to use 48-bit block addressing, it appears my choices are:Break up the volume into smaller volumes < 16TB, or Use xfs or zfs (I have already created a test xfs partition, and it works fine).
Does anyone have any opinions about which option is preferable? I have never used xfs before. Is it as robust as ext4? Is it as well supported by Ubuntu? What about zfs? Is it worth downloading from the ppa?
Second Question: I now have a huge amount of data to back up. In the old days, I remember making a full backup of a "big" 10 MB hard drive by taking a stack of floppies and inserting them one at a time into my floppy drive while my backup program split the backup into 1.4 MB chunks small enough to fit on a floppy.
I now have the same problem, but at a different scale. I need to back up 20+TB onto a stack of external 2TB drives. Is there any software package that can fragment a backup in this way?
I want to know how much time the computer is performing IO read/write during a time interval, so that i can compute the percentage of time spending on IO. I look at /proc/diskstats, and notice that there are these fields:
Field 1 -- # of reads issued
Field 2 -- # of reads merged, field 6 -- # of writes merged
Field 3 -- # of sectors read
Field 4 -- # of milliseconds spent reading
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How can this happen? I thought the maximum value of the read and write time should not exceed the total time. Am I doing something wrong? Are there any other methods to get the disk IO time?
So after installing Ubuntu 11.04 with Fedora Beta 15, I decided it would be a good idea to get a *buntu based distro in case of anything. So I reinstalled it in the form of Xubuntu, and I see that Grub found my Windows 7 install, but not my Fedora install! Here is the output of fdisk -l:
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Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
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While doing some experiments with my partitions I must have messed up something and I am unable to mount or unmount USB devices graphically, it simply says I have not the permission...Apart from playing with pysdm settings, the only bad thing I did was to change the permissions....(suggestion from another forum)$ sudo chmod -R 777 /Datasudo chown -R fred:fred /Data
View 2 Replies View RelatedI'm getting these Message during Lenny startup:
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mount : according to mtab, procbususb is already mounted on /proc/bus/usb failed.What's wrong and howto solve this problem?
Red Hat Enterprise Linux Server release 5.4 (Tikanga) 2.6.18-164.11.1.el5xen (Xen release for virtualisation)
I'm trying to track down a problem with a utility that used to work and now hangs indefinitely. Since its hanging, I suspected a locking problem, and went to have a look for the process ids in /proc/locks; I get:
148: FLOCK ADVISORY WRITE 30279 ca:21:49153 0 EOF
148: -> FLOCK ADVISORY READ 30282 ca:21:49153 0 EOF
Now as near as I can tell this shouldn't be my problem, since the two ADVISORY locks - one READ and one WRITE - shouldn't conflict with one another. But I'd like to understand it all the same. I haven't been able to find any kind of definitive guide for the format of /proc/locks entries, but what I did find in the manuals specifically states:
"Each lock has its own line which starts with a unique number. "
Which is obviously not true; both of my lines start with the same number. Also, since most search engines don't seem to play nicely with symbols, I can't find any reference to what the "->" means.
I am currently writing a JAVA script to monitor certain unix processes through JConsole. Upon having lots of trouble with runtime.exec, i decided to bypass the top/ps command call and just get the information straight from /proc/*pid*/whatever.Now i can pull back any information from any of the files I want, and the current way i determine the CPU usage of a process is as follows:
Add the UTime and STime of that process from /proc/pid/stat then divide my pidCpu by UTime + STime + NTime from /proc/stat, then multiply that by 100, should give me the % cpu usage a process is using, right?Theory being if I get the jiffies assigned to my process, I can divide that by the total jiffies the cpu assigns. However, my results seem to vary from the ones gathered from top and ps. What am I doing wrong?
unknow filesystem in my computer./proc/sys/fs/binfmt_miscPlease help me for remove this filesystem.How i do remove this filesystem?OS : ubuntu 10.04
View 2 Replies View Relatedi want to map my novell server volume in my linux EL-4 system.
View 1 Replies View Related