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Topic: Logical Volume Manager (Linux)

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	The Linux Logical Volume Manager \| Linux Magazine
		In the case of the second logical volume, bio_lv, we specify (via -r) that the read-ahead mode chunk size is eight sectors (the amount of data returned at a time during sequential access) and that the logical volume be created contiguous (via the -C y option).
		The scheme involves the creation of a temporary, additional logical volume that is used as the target location for storing file modifications within another logical volume's filesystem during the time that a backup is actually running.
		As long as the snapshot logical volume exists, any changes to the filesystem are propagated to the snapshot; for example, modified files are copied there.
	www.linux-mag.com /id/650 (1744 words)

	Logical Volume Manager
		The logical volume group is divided into logical volumes, which are assigned mount points such as /home and / and file system types such as ext3.
		When "partitions" reach their full capacity, free space from the logical volume group can be added to the logical volume to increase the size of the partition.
		The summation of the physical volumes may not equal the size of the volume group; however, the size of the logical volumes shown is correct.
	www.skywayradio.com /tech/linux/lvm.html (973 words)

	lvm.8: Linux Logical Volume Manager - linux man page (Site not responding. Last check: 2007-10-26)
		Creating a snapshot logical volumes grants access to the contents of the original logical volume it is associated with and exposes the read only contents at the creation time of the snapshot.
		The limit for the logical volumes is not caused by the LVM but by Linux 8 bit device minor numbers.
		This means that you can have 99 volume groups with 1-3 logical volumes each or on the other hand 1 volume group with up to 256 logical volumes or anything in between these extreme examples.
	www.maconlinux.net /linux-man-pages/en/lvm.8.html (1044 words)

	redhat.com \| The Linux Logical Volume Manager
		The striped mapping allows a single logical volume to nearly achieve the combined performance of two PVs and is used quite often to achieve high-bandwidth disk transfers.
		Logical volume snapshots can be created to represent the exact state of the volume at a certain point-in-time, allowing accurate backups to proceed simultaneously with regular system operation
		It is possible to allocate a logical volume from a specific physical volume in the VG by specifying the PV or PVs at the end of the
	www.redhat.com /magazine/009jul05/features/lvm2 (1385 words)

	UKUUG Linux 2000 Conference - Timetable
		A Logical Volume Manager (LVM) is a subsystem for on-line disk storage management which has become a de-facto standard accross UNIX implementations and is a serious enabler for Linux in the Enterprise Computing area.
		Once created, the volume group, and not the disk, is the basic unit of data storage (think of it as a virtual disk consisting of one or more physical disks).
		Volume groups as well as logical volumes can be resized at runtime without system interruption (in the case of hot plugable disk subsystems) to enable continuous system uptime.
	www.ukuug.org /events/linux2000/speaker-HM.shtml (411 words)

	Logical Volume Manager - Pogo Linux, Inc. (Site not responding. Last check: 2007-10-26)
		Logical Volume Manager is used to combine block devices together to create a transparent medium for creating flexible 'Logical Volumes'.
		Logical Volumes can then be made from a Volume Group, similar to slices of a pie.
		Logical Volumes are what the operating system sees as actual partitions that can be mounted, read from, and written to.
	www.pogolinux.com /storage/LVM.html (209 words)

	LVM - LQWiki (Site not responding. Last check: 2007-10-26)
		If several physical volumes are to be used within a volume group they should have the same allocation size (physical extents) defaulting to 4MB.
		A logical volume is a set of extents allocated from a physical volume and is a concept analogous of a disk partition.
		A logical volume can be resized as nessecary without the need of reformatting and explicit copying of all its contents.
	wiki.linuxquestions.org /wiki/LVM (432 words)

	Logical Volume Managers \| Malta Linux User Group
		Logical Volume Managers can take away many of the headaches traditionally associated with managing your hard disks.
		The first hard disk (hda) is divided between the two logical volumes, while the second hard disk (hdb) is completely dedicated to the second logical volume.
		You can format your logical volume in the same way that you do a normal partition, using filesystems such as ext2, ext3, ReiserFS, JFS or XFS - all the features offered by these filesystems will be available as usual.
	www.linux.org.mt /article/lvm (1042 words)

	ITworld.com - LINUX TIPS AND TRICKS - Logical Volume Manager
		Portions of volume groups can be allocated in the form of logical volumes (lvols, the logical equivalent of a partition) in units called "logical extents" (LEs), where each logical extent is mapped to a corresponding physical extent of equal size.
		As the volume groups and logical volumes are a virtual representation of hard disks and partitions, you can easily expand or shrink a logical volume, even at run-time.
		Starting with kernel 2.3.47, Linux has a built-in LVM driver that maintains mapping tables between the volume groups and logical volumes and their corresponding physical disks and partitions.
	www.itworld.com /nl/lnx_tip/11162001/pf_index.html (526 words)

	Set up Logical Volume Manager in Linux
		Logical Volume Manager (LVM), is a mechanism to create virtual drives out of physical drives.
		These virtual (or logical) drives can then be manipulated in interesting ways: They can be grown or shrunk, and they can span more than one physical disk.
		There is a lot more information about manipulating and maintaining LVM volumes out there, and it would be wise to become familiar with it, but it's quite straightforward to create your first LVM volume.
	articles.techrepublic.com.com /5100-1035_11-6166001.html (555 words)

	The Linux Logical Volume Manager (Site not responding. Last check: 2007-10-26)
		Logical volume management is a widely-used technique for deploying logical rather than physical storage.
		The striped mapping allows a single logical volume to nearly achieve the combined performance of two PVs and is used quite often to achieve high-bandwidth disk transfers.
		Logical volume snapshots can be created to represent the exact state of the volume at a certain point-in-time, allowing accurate backups to proceed simultaneously with regular system operation
	www.softpanorama.org /Commercial_unixes/RHEL/rhel_logical_volume_manager.shtml (1347 words)

	The Logical Volume Manager (LVM) - Part 1 (Site not responding. Last check: 2007-10-26)
		If the filesystem on the logical volume supports it (like ReiserFS on SUSE LINUX does) it can be resized during runtime as well to immediately use the additional space, without unmounting it so that applications and users will not even notice the operation.
		For example, if logical storage is moved to a different physical location, only the node performing the operation is aware of it while all others are not aware of it and continue using the old location.
		When an application now wants to access storage on a logical volume, the LE this space is in is identified and by using the unique ID number of the LE in the LV both the PV and the PE are found in the mapping table.
	www.suse.com /en/whitepapers/lvm/lvm1.html (2763 words)

	Проект OpenNet: MAN lvm (8) Команды системного администрирования (FreeBSD и ...
		Creating a snapshot logical volumes grants access to the contents of the original logical volume it is associated with and exposes the read only contents at the creation time of the snapshot.
		The limit for the logical volumes is not caused by the LVM but by Linux 8 bit device minor numbers.
		This means that you can have 99 volume groups with 1-3 logical volumes each or on the other hand 1 volume group with up to 256 logical volumes or anything in between these extreme examples.
	palm.opennet.ru /man.shtml?topic=lvm&category=8&russian=3 (993 words)

	[No title] (Site not responding. Last check: 2007-10-26)
		A3: your volume group is full or you've already reached the maximum logical volume size in that volume group.
		Logical volume size is limited by the size of the physical extents times their maximum amount, which only can be set at volume group creation time.
		You have to delete logical volumes in different volume groups to be able to create the new one.
	www.ccsinc.com /doc/packages/lvm/FAQ (1012 words)

	RAID and Data Protection Solutions for Linux
		The volume group can be in turn be carved up into virtual partitions (logical volumes) that behave just like the ordinary disk block devices, except that (unlike disk partitions) they can be dynamically grown, shrunk and moved about without rebooting the system or entering into maintenance/standalone mode.
		Linux LVM and Linux Software RAID can be used together, although neither layer knows about the other, and some of the advantages of LVM seem to be lost as a result.
		Linux RAID devices cannot be dynamically resized, nor is it easy to move a RAID array from one set of drives to another.
	linas.org /linux/raid.html (4585 words)

	Logical Volume Manager - LinuxQuestions.org
		If it is Linux Related and doesn't seem to fit in any other forum then this is the place.
		The vg had 3 logical volumes: a 2GB lv root_volume, mounted as /, a 300MB lv home_volume mounted as /vol/home and a 200MB lv scratch_volume mounted as /vol/scratch.
		The volumes were unmounted, but the vg and lvs were active.
	www.linuxquestions.org /questions/showthread.php?t=118098 (724 words)

	Logical Volume Managers \| Malta Linux User Group
		Logical Volume Managers can take away many of the headaches traditionally associated with managing your hard disks.
		The first hard disk (hda) is divided between the two logical volumes, while the second hard disk (hdb) is completely dedicated to the second logical volume.
		You can format your logical volume in the same way that you do a normal partition, using filesystems such as ext2, ext3, ReiserFS, JFS or XFS - all the features offered by these filesystems will be available as usual.
	linux.org.mt /article/lvm (1041 words)

	Debian/Ubuntu Tips & Tricks \| Debuntu.org: .deb packages, Unix/Linux Tutorials and Articles.
		LVM (Logical Volume Manager) is a great piece of software which allow you to deal with Logical Volumes.
		Using LVM along with ext3 filesystem, you are allowed to extend the size of your logical drives which is pretty handy when running out of space.
		Linux services can be started, stopped and reloaded with the use of scripts stocked in /etc/init.d/.
	www.debuntu.org (480 words)

	A Walkthrough of the LVM for Linux
		A Walkthrough of the Logical Volume Manager for Linux
		It is intended to introduce the concepts of Logical Volume Management for UNIX through simple exercises performed in a Linux LVM environment.
		Logical Volume Management is a fundamental way to manage UNIX storage systems in a scalable, forward-thinking manner.
	www.gweep.net /~sfoskett/linux/lvmlinux.html (1302 words)

	RAC Preparing Shared Storage Volume Management Logical Volume Manager LUN
		The Logical Volume Manager (LVM), a software module running at the host level, manages the physical objects and presents them as logical units that the application can use.
		Within the volume manager, storage devices are grouped into disk groups (e.g., Veritas disk group).
		Finally, the logical volume is either presented as a file system after mounting, or presented as a raw partition for application use.
	www.dba-oracle.com /grid_254.htm (380 words)

	Craig's Linux Notes: LVM - Logical Volume Manager (Site not responding. Last check: 2007-10-26)
		Also see the LVM Howto: Extending a Logical Volume.
		LVM's metadata tells it where the physical and logical partitions are.
		Should report which disk partitions are participating as volume groups, and the metadata version (lvm1 or lvm2).
	users.dslextreme.com /~craig.lawson/linux_notes/lvm.html (492 words)

	Logical Volume Manager (LVM) and Veritas Volume Manager (Site not responding. Last check: 2007-10-26)
		Logical Volume Manager (LVM) and Veritas Volume Manager
		LVM procedures will be detailed such as how to mirror root and swap disk, create new volume groups, import and export volume groups, and add disks.
		The course concludes with how to load and use HP Veritas Volume Manager (VxVM) to perform some basic storage management tasks such as mirroring and striping.
	www.mindiq.com /ilt/hpux/hp400.php (260 words)

	Common threads: Learning Linux LVM, Part 1
		However, unlike physical volumes, the logical volumes can be expanded 0and shrunk while the system is still running, providing Linux system administrators with the storage flexibility that they've until now only dreamed of.
		Creating an LVM logical volume is really easy, and once it's created we can go ahead and put a filesystem on it, mount it, and start using the volume to store our files.
		To create a logical volume, we use the "lvcreate" command, specifying the name of our new volume, the size we'd like the volume to be, and the volume group that we'd like this particluar logical volume to be part of.
	www-106.ibm.com /developerworks/linux/library/l-lvm/?dwzone=linux?open&l=335,t=gr,p=lrnglxLVM1 (2194 words)

	Consistent backup with Linux Logical Volume Manager (LVM) snapshots \| nixCraft
		LVM is an implementation of a logical volume manager for the Linux kernel.
		A snapshot volume is a special type of volume that presents all the data that was in the volume at the time the snapshot was created.
		This means you can back up that volume without having to worry about data being changed while the backup is going on, and you don’t have to take the database volume offline while the backup is taking place.
	www.cyberciti.biz /tips/consistent-backup-linux-logical-volume-manager-snapshots.html (945 words)

	Logical Volume Manager - ArsLinuxWiki (Site not responding. Last check: 2007-10-26)
		This creates a volume group named vg00 (the full path to the volume group is /dev/vg00) and adds our 3 partitions to the group.
		The easiest solution is to move the data elsewhere, create the volume group, and move the data back.
		In this case, the solution is to create a volume using the disks without data, move the critical data onto the new volume, and then add the disk which previously contained the data to the volume.
	wiki.arslinux.com /Logical_Volume_Manager (667 words)

	Linux Logical Volume Manager 1.0 released under GPL
		LVM is a subsystem for on-line disk storage management that has become a de-facto standard for storage management across Linux implementations.
		LVM supports enterprise level volume management of disk and disk subsystems by grouping arbitrary disks into volume groups.
		The total capacity of volume groups can be allocated to logical volumes, which are accessed as regular block devices.
	www.linuxdevices.com /news/NS3055055094.html (375 words)

	Sys Admin > Logical Volume Manager for Linux
		A volume group may consist of multiple physical disks and is represented as one large storage space.
		A disk may be added to a volume group at any time when there is a need to increase data storage capacity.
		Linux LVM was recently released and is similar to the LVM used on HP-UX.
	www.samag.com /documents/s=1162/sam0008b/0008b.htm (456 words)

	Linux Logical Volume Manager (LVM) on Software RAID
		Logical Volume Manager is now included with most Linux distributions.
		You can have a Volume Group that has only one disk partition in it, or several partitions on one or more disks.
		For a LVM volume group, one physical volume is enough.
	aplawrence.com /Linux/lvm.html (1995 words)

	GNU/Linux - Setting Up Logical Volume Manager
		Logical Volume Manager (LVM) allows you to combine disks and create a single volume that can be mounted like a regular partition.
		Linux is a registered trademark of Linus Torvalds, and refers to the Linux kernel.
		The operating system of most distributions that contain the Linux kernel is GNU/Linux.
	www.netadmintools.com /art365.html (421 words)

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