General :: Find The OID Code For A Physical Volume?
May 18, 2011
How do I find the OID code for a physical volume.I managed to get it to work with our snmp monitoring software to alert me when disk space was < 10% but the computer which was running the SNMP monitoring died.For the life of me I can't remeber how I got it to work.I have 4 partitions 1 has 88% free /etc/mapper/volgroup002 has 21% free /boot3 nfsd 0 bytes4 sunrpc 0 bytesHere is a copy of the OID I'm using 1.3.6.1.2.1.25.2.3.1.5.1 I change the last number to resemble the drive but i'm testing using 8% and they each return an error drive space low which is what the VB script tells it to do. I know the script works as I use it on Windows Servers no problems.I do an SNMPWALK on the server and it validates the above OID with HOST-RESOURCES-MIB::hrStorageSize so I know thats valid.But thats where I'm stuck. What value should I see if I were to use this OID 1.3.6.1.2.1.25.2.3.1.6.1 which is for free disk space.
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Aug 7, 2010
Let's assume I have a volume group (VG) with six physical volumens (PV) - sdb1, sdb2, sdb3, sdc1, sdc2, sdc3..I want to remove one of the PVs from the group in order to use its space elsewhere - how can I know if it's safe? How can I do that without losing data and without first "pvmove"ing it elsewhere?Reading a bit more, my guess is using the result of pvscan, but I thought I'd ask before removing keeping it safe as I'm not an LVM expert.
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Jul 13, 2010
WHat is the physical volume in LVM's? Why do we need to create a physical volume first before creating LVM's? I mean, LVM's are created from physical disks, so why do we need to specify it? Didnt get it. Anybody want to help me with this?
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Nov 9, 2010
Maybe I'm missing something obvious but I do not see it listed in vgdisplay.
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Jul 29, 2010
Hi,
I am experiencing problems in creating a physical volume on RAID 1 system.
Here is what I did.
#/usr/sbin/pvcreate /dev/md0
the message reads:
"Device /dev/md0 not found (or ignored by filtering)."
The /dev/md0 has a partition type 8e for linux LVM
Can anyone enlighten me?
Thanks
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Mar 17, 2010
how easy it would be to read the contents of a physical disk that was part of a larger logical volume. The disk contains a "Linux LVM" partition that spans its entire size. My problem is that one of my disks died, and I have to send it back for a warranty replacement. However, the disk is dead, and I can't zero it out. I'm just trying to assess how difficult it would be (or at least how likely it would be) for a tech that's checking out the disk to get at the data.
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Jan 1, 2010
so i have f12 installed on my hd with lvm using the whole extent of the HD , i want to reduce it so i can dual boot it with a windows system, i managed to reduce the logical volume to free some space, but i cant seem to reduce the physical volume, is this possible and how ?
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Feb 23, 2010
I was running through a fairly routine Gentoo install on a 160G hard disk. My intention was to have two partitions on the disks: one for boot, and one to be an LVM physical volume. In a stroke of absent-mindedness, however, I forgot to create the boot partition and only created the LVM physical volumend didn't realize ituntil the end of the installation.Anyway, I just want to shrink the physical volume partition and add in another partition with fdisk. However, this doesn't seem to be working the way I intend. I ran
Code:
livecd dev # pvresize --setphysicalvolumesize 159G /dev/hda1
WARNING: /dev/hda1: Overriding real size. You could lose data.
[code]....
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Sep 2, 2011
There is a computer with two "Xeon(R) CPU X5550 @ 2.67GHz" CPU. The Hyper-threading is enabled, so it looks like 16-core system, but really there is only 8 physical cores.
I know that when hyperthreading is enabled, each physical core is splitted into two virtual cores. I want to know, which pair of virtual cores shares a physical core and which are not. Or, how (in what order) will Linux enumerate HT-cores comparing to real cores. (enumerating is done for sched_setaffinity and taskset masks).
I have a dump of /proc/cpuinfo file from the system.
I think there are possible:
CPU0-CPU7 are not sharing phys. core. CPU8-CPU15 too. But sharing is in pairs CPU0+CPU8, CPU(i)+CPU(i+8) and so on. or CPU0+CPU1 are from single physical, CPU2+CPU3, CPU(2*i)+CPU(2*i+1). or exotic CPU0+CPU15 sharing, CPU1+CPU14 ... or random?
The hard moment in this case is that there are 2 physical dies of CPU (two sockets), and usual recommendation of using "physical id:" field can't help
The cpuinfo:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
[Code].....
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Jan 22, 2010
So I got a bad physical volume inisde my logical volume. I want to do this safely rather than tinkering around, how can I get the bad physical disk out and look at the data on the other 2 drives to see if I can save anything? Its just the standard fedora setup where it combines all the disks, nothing fancy.
I have the volume group activated as a partial, and now I just want to see the data on the other sections how could I mount that?
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Jun 11, 2010
I have kind of test partition, but I need lv_root on it. So I have:
Code:
Using physical volume(s) on command line
PV VG Fmt Attr PSize PFree Start SSize LV Start Type PE Ranges /dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 0 6859 lv_root 0 linear /dev/sda6:0-6858
/dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 6859 128 lv_swap 0 linear /dev/sda6:6859-6986
/dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 6987 512 lv_root 6859 linear /dev/sda6:6987-7498
/dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 7499 2 lv_swap 128 linear /dev/sda6:7499-7500
/dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 7501 110 0 free
I want to move "lv_swap" to the end of VG. I want to delete its segment, and rest of VG to use for "lv_root".
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Apr 11, 2011
I have a 500GB hard disk, /dev/sda. On it, there is /dev/sda1 for /boot, /dev/sda2 for an LVM PV (physical volume), and /dev/sda3 for another /boot (multiple Linux distros, one boot partition for grub legacy, another for grub2). so the LVM2 partition, /dev/sda2, is taking up ~465GiB. I want to add another OS (non-Linux), so I resized the *lvm2 physical volume* to 320GiB, successfully, using pvresize.
However, I now need to resize the partition so the lvm2 physical volume only just fits on it, ie to 320GiB. My plan of action is to use gparted (the partition table is GUID, so fdisk won't work), to first delete the partition from the partition table, then re-add it but this time with a smaller value (~320GiB). The problem is that I need to know exactly how many MiB/cylinders the physical volume is taking up. So, I run:
Code:
root@sysresccd /root % pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg0
[code]....
What one of these values do I need to set the new lvm2 replacement partition to?
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Jul 10, 2011
When I installed Ubuntu, I created an 52 gb encrypted partition which shows up in the disk utility, and in the window that opens when I click on the "home folder" icon. I get my normal windows partition, and under that the 52 GB LVM2 partition. But when I try to access it, I get this error.
Unable to mount 52 GB LVM2 Physical Volume - not a mountable file system
This is what fdisk -l shows
Device Boot Start End Blocks Id System
/dev/sda1 * 1 52 409600 27 Unknown
Partition 1 does not end on cylinder boundary.
/dev/sda2 52 30452 244193280 7 HPFS/NTFS
[Code]....
How can I fix this, and be able to access that 52gb partition? This is only my second day that I work with Ubuntu, so If more information is needed then let me know
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Jul 5, 2011
I have a 7.9 TB logical volume I've created from 8 1 TB RAID 0 devices. The volume is formatted with XFS so I can resize when ready. However, I think I want to do something that is not possible. I have 2.5 TB free on my logical volume. I'd like to shrink the volume down to be 6 TB by getting rid of 2 of the 1 TB devices in the physical volume. However pvmove seems to require free extents in order to work. Do I need to add 6 TB of storage, pvmove everything onto it, and then decommission the original 8 1 TB physical devices from the volume?
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Sep 16, 2010
Is is possible to extend physical volume disk space from one to another?
Quote:
PV VG Fmt Attr PSize PFree
/dev/sda1 Zeus-extra lvm2 a- 149.05G 17.05G
/dev/sdb1 Zeus-misc lvm2 a- 394.96G 274.96G
Could I get 50GB from /dev/sdb1 and add it to /dev/sda1 ???
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Apr 26, 2010
How to create multiple Logical Groups out of a single Physical Volume? Here is the Physical Volume I have created:
Code:
# pvdisplay
--- Physical volume ---
PV Name /dev/sda9
VG Name myVG1
PV Size 54.88 MB / not usable 2.88 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 13
Free PE 11
Allocated PE 2
PV UUID bon4Ao-vmgC-aP1h-EC9X-w3tN-YXNu-0N2dAw
This is how I am creating a Logical Group out of the above Physical Volume:
Code:
# vgcreate myVG1 -s 4m /dev/sda9
Display:
Code:
# vgdisplay
--- Volume group ---
VG Name myVG1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 52.00 MB
PE Size 4.00 MB
Total PE 13
Alloc PE / Size 2 / 8.00 MB
Free PE / Size 11 / 44.00 MB
VG UUID O6ljYC-bflz-EUTd-nf34-8gYe-Fh39-Bh3cOg
But I am unable to create one more Logical Group out of this Physical Volume. Can we accomplish it? Or do we always extend our current Logical Group to utilize the available space of a Physical Volume?
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Dec 28, 2009
I have a 160GB harddrive with 2 partitions:
1. /dev/sda1 ext2 100MB (this is my /boot partition)
2. /dev/sda2 LVM2 Remaining space (this is my physical volume and is LUKS-encrypted)
There is 1 volume group, slackvg, and 3 logical volumes:
1. swap 2GB
2. root jfs 10GB
3. home jfs 50GB
I would like to shrink /dev/sda2 to make room for another regular partition, is this possible?
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Mar 17, 2011
I just installed linux fedora 14 on my hp probook 4320s with installation CD with this name: Fedora-14-x86_64-Live-Desktop. Then I installed it on the hard disk. During installation I chose to encrypt hard disk. When I try to access my hard disk it says "unable to mount 250GB LVM2 Physical Volume, Not a mountable file system". What can I do to get access to my hard disk?
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Jul 18, 2010
I was trying to remove the physical volume from an old drive. So I opened gparted and told it to rewrite the partition table. The only problem is I targeted the wrong volume, I wiped the partition table on my 4tb raid5 array This 4tb array has everything! All my movies, tv shows, music. The only things I have backup up off site are my smaller files like documents. I was about to lose my whole media collection.
I did some research and found a solution that I will post here in the hopes that someone will google "I deleted the partition table on my lvm" and be find the solution.You should find in your filesystem a /etc/lvm/backup folder. LVM puts a copy of the crucial lvm information there every time you change the the volume group.
In this folder you will find a file for each volume group. In this file you will find the uuid for all of the physical volumes that make up that group.The first step is to recreate each physical volume with their original uuids. In my case I had only 1 physical volume, which was my raid5 array. My recreation command looked like this:
pvcreate --uuid cLrY02-zrVi-D0Vi-cIPB-6fF5-ed0c-XFF0os /dev/md0
Now I have a physical volume with the same uuid it had before. It is essential that you correctly match up the uuids with the correct physical deviecs.The recreated pv is empty, the volume group needs to be recovered. This is done by using a special tool and the backup file. For me the command looked like this:
vgcfgrestore --file /etc/lvm/backup/raid5 raid5
This tells it to recreate the volume group using the information in the backup file. The backup files looks for the uuid of the PV, which now matches the correct volume. The coordinates in the backup file match up to the data on the array an suddenly everything is back!
When I deleted my LVM partition table I did not damage any of the actual volumes on the volume group, I just wiped out the table of contents. The backup file had the information needed to rewrite this table of contents.
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Apr 27, 2011
I am trying to find and delete a file using this Code: find . -type f -name ph2964781400100954291.jpg -exec rm -f {} ; It does not work, I think because by default on my distro rm is iterative.
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Jul 16, 2010
send me the code to find the md5 checksum of a file in c++.
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Aug 1, 2010
this is srinath,newbie to linux and shell scripts.am in need of shell script,which have to checkout the source code(C/C++) from CVS server to a specified directory and compile that source code and get all its dependency files to a specified directory.
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Nov 23, 2009
As part of my testing, I need to find a tool that will write/read IO to a volume. I need it to fill the volume and then read and verify that the write was successful. hroughput stats would be a plus, but right now, IO verification is a must.I need the volume to write, read, verify, then repeat until the volume is full.Can anyone point me to a free tool that can manage this?
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Jun 21, 2010
I am in need of finding out the physical interface corresponds to eth0,eth1,eth2., As similar like the lscfg command which is available in the AIX operating system. The output given below got it from AIX OS.
$ lscfg -l ent*
ent2 U787B.001.DNWFFC6-P1-T9 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
ent3 U787B.001.DNWFFC6-P1-T10 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
ent0 U787B.001.DNWFFC6-P1-C4-T1 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
ent1 U787B.001.DNWFFC6-P1-C4-T2 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
Is there any utility/commands available to find out the physical interface ?
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Oct 22, 2009
I allocated a chunk of memory using kmalloc in a Device Driver. Kmalloc provides a pointer to the allocated memory. This is one of my first few drivers.
I assume that the address returned is a Virtual address. I need to find the physical address of the memory location. I am working on an Intel 64 bit Fedora machine. I used the virt_to_phys() routine present in <asm/io_64.h>. I found that this routine returns an unsigned long value (32 bit) instead of an unsigned long long value (64 bit). Moreover, it seems that it simply returns the address - OFFSET instead of extracting the value in the page tables.
So is there any function / system call in Linux which will allow me to see the actual physical address on the Intel 64 arch.
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Jul 17, 2011
I have (at least 4) native USB ports that contain flash drives. I know that the /dev/sd[abcd] devices are created in the order they were inserted, but say you have all four plugged in at boot time, or further, they can be plugged and unplugged in real time. At times, /dev/sdf, /dev/sdg, etc. are created as well. I'm ignoring external hubs for now.
I need to know which drive is plugged into the "top port on the front panel", etc, by physical location. From dmesg I can check right after booting and get the physical assignment of a PCI device, say, PCI 0000:00:10.3, as being assigned to the EHCI usb bus. From /proc/bus/usb/devices, and the "T:" field, I have learned that the physical connectors I'm interested are known as USB Bus 1, Port=00, Port=01, Port=04, and Port=05.
From lsusb I can see all sorts of information from the USB point of view, but with no /dev/sd references.
From /proc/scsi/scsi, I can see what scsi devices have been created, with a count consistent with the number of flash drives plugged in, but no USB data.
So, I can get lots of information from the USB storage point of view, and lots of information from the SCSI point of view, but nowhere can I find how to correlate them. In other words, if I want to mount the drive plugged into a given physical slot, how can I find the /dev/sd device I need to mount? udev isn't really interesting here, because I'm just looking for the information that udev would use to answer the same question.
I've done some heaving exploring in the /sys and /proc filesystems and have not yet found where the USB and SCSI worlds intersect.
The closest I have found is (where "Port" is the physical port number from above):
This seems to have some mapping to the physical port and references a "/dev/sd[a-z]" value, but I don't know how reliable it might be, nor do I know if my having to increment that physical port by 1 is meaningful. Anyone have a simpler approach?
So, my goal becomes
mount /dev/<sd that was created for the top slot> /mnt/top
mount /dev/<sd that was created for the bottom slot> /mnt/bottom etc.
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Jan 29, 2010
I am in the process of re-DL-ing the ISO as the checksums didn't match.
Mind you, that was with a shell extension in Win-Lose. Who knows.
Anyway:
I have the ISO (that I had previously) on a USB courtesy of UNetBootIn. All appears well until, quite quickly, I receive an error after the loading process which goes something like:
Code:
Error: cannot find disk at [hash-code - looks like 0ace5f etc etc, is about 12 char's in length.]Something very similar (but not same error I think) happened when I tried to do the same with my OpenSolaris or Fedora install. I.e., gets as far as the very beginning of the loader and then: bork.
At least one of them said "will reboot in 120 secs". Saves me the trouble!
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Dec 1, 2010
I'm rearranging a bunch of disks on my server at home and I find myself in the position of wanting to move a bunch of LVM logical volumes to another volume group. Is there a simple way to do this? I saw mention of a cplv command but this seems to be either old or not something that was ever available for linux.
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Jan 19, 2011
I need a mixer app called envy24control. Nobody seems to have a Slackware package for it, which would not be a big deal except that I cannot find the source code either! Does anyone know where I can find this thing?
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Feb 7, 2010
I have downloaded both fedora 11 64bit DVD iso and fedora 12 64 bit live cd,but the install failed on a brand new AMD Athlon II X4. The f11 was polite and said there were errors in the media, but f12 displayed an illegible line of text and stopped. On prior installs there was a obvious checksum value to verify that the download was good So far I have been unable to find one. I'd like to verify that the download is good before I buy more crappy cd's that don't work.
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