Introduction to Disk Space Management and LVM * Disk space management solutions * Whole disk benefits and limitations * LVM benefits and limitations * LVM resources * Disk space management solution comparison Disk array & SAN concepts and addressing * Disk array concepts * LUN concepts * RAID concepts * RAID 0, RAID 1, RAID 1+0, and RAID 0+1 concepts * RAID 3, RAID 5, and RAID 5DP concepts * RAID levels and LVM * SAN and multipathing concepts * Hardware address concepts * Legacy vs. Agile View hardware addresses * Legacy parallel SCSI hardware addresses * Legacy FC hardware addresses * Legacy DSF names * Viewing legacy hardware addresses and DSFs * Agile View SCSI hardware addresses * Agile View FC lunpath hardware addresses * Agile View FC LUN hardware addresses * Agile View persistent DSFs * Viewing Agile View hardware addresses and DSFs * Viewing an HBA's lunpaths via Agile View * Viewing a LUN’s WWID and LUN ID via Agile View * Viewing a LUN’s WWID and lunpaths via Agile View * Selecting a path load balancing policy * Monitoring HBA, LUN, and lunpath usage * Monitoring HB, LUN, and lunpath health * Enabling and disabling LUNs and lunpaths LVM concepts and structures * LVM objects * LVM physical volumes, volume groups, and logical volumes * LVM DSF directories and DSFs * LVM extents * LVM extent allocation * LVM PVRA, VGRA, and BBRA areas * LVM kernel structures and volume group activation * LVM activation quorum * LVM running quorum * LVMv1.0 and v2.x limits Creating and Managing Volume Groups and Logical Volumes * Identifying available disks * Creating physical volumes * Creating volume groups * Creating logical volumes * Viewing groups and volumes * Extending, reducing, and removing volume groups * Extending, reducing, and removing logical volumes * Extending and reducing file systems * Removing physical volumes * Activating and deactivating volume groups * LVM basic command summary Configuring and Managing Mirrored Logical Volumes * Mirroring concepts * Installing MirrorDisk/UX * Mirroring logical volumes * Viewing logical volumes * Unmirroring logical volumes * Synchronizing mirrors * Splitting and merging mirrors for on-host and off-host backups * Configuring spare physical volumes Configuring and managing mirroring policies * Mirroring policy concepts * Mirror scheduling policy concepts * Choosing and configuring an appropriate mirror scheduling policy * Mirror consistency recovery policy concepts * Choosing and configuring an appropriate consistency recovery policy * Mirror allocation policy concepts * Choosing and configuring an appropriate mirror allocation policy * Mirroring policy summary Creating and Managing Striped and Distributed Logical Volumes * Striped logical volumes * Striped logical volume advantages and disadvantages * Configuring non-mirrored striped logical volumes * Striped versus distributed logical volumes * Creating a non-mirrored distributed logical volume * Creating a mirrored distributed logical volume * Configuring /etc/lvmpvg for distributed logical volumes Moving Data in an LVM Environment * Why move extents within a volume group * Moving and balancing physical extents with pvmove * Moving and balancing logical volumes with lvmove * Moving logical volumes and physical extents with vgmove Exporting and Importing Volume Groups * Volume group export/import concepts * Structures affected by physical volume and volume group moves * Volume group export/import commands * Moving volume groups and physical volumes to a different server * Moving a physical volume to a new address * Renaming a volume group * Importing volume groups after reinstalling * Importing split mirrors for off-host processing * Exporting a corrupted volume group * Importing volume groups in Serviceguard clusters Monitoring and Tuning LVM Performance * LVM performance considerations * Balancing workloads: concepts and symptoms * Balancing workloads: overriding the default allocation policy * Balancing workloads: striping logical volumes * Balancing workloads: mirroring logical volumes * Minimizing head movement: concepts,symptoms, and commands * Avoiding fragmentation: concepts, symptoms, and commands * Minimizing MWC/MCR overhead: concepts, symptoms, and commands * Buying faster disks and interfaces * Updating the Operating System * Other performance factors Recovering LVM Disks and Structures * LVM structure concepts * Recovering lost or damaged LVM structures * Recovering missing device files * Rebuilding a corrupt /etc/lvmtab file * Refreshing outdated kernel structures * Failed disks: symptoms experienced by users * Failed disks: symptoms reported in syslog.log * Failed disks: symptoms reported by EMS * Failed disks: symptoms reported in vgdisplay * Failed disks: symptoms reported in ioscan * Activating a volume group containing failed disks * Gathering information about failed disks * Restoring a power-failed disk * Replacing a failed disk * Replacing a disk with and without LVM OLR * Restoring LVM headers * Restoring unmirrored logical volumes * Restoring mirrored logical volumes * Removing failed physical volumes * Removing corrupted volume groups * Proactively checking PVRA/VGRA health * Preparing for disk recovery Managing volume group attributes * LVMv1 attribute concepts & limits * LVMv2 attribute concepts & limits * Managing LVMv1 attributes with vgmodify * Managing LVMv2 attributes with vgmodify * Expanding & contracting LUNs offline with vgmodify * Expanding & contracting LUNs online with vgmodify * Upgrading volume groups with vgversion Configuring and Managing LVM Boot Disks on PA-RISC Servers * PA-RISC boot process structures, concepts, and restrictions * Booting without LVM quorum * Booting to LVM maintenance mode * PA-RISC boot disk mirroring concepts * Mirroring a boot disk * Replacing a failed boot mirror * Creating a DRD clone * Creating a make_*_recovery archive * Resizing boot disk logical volumes Configuring and Managing LVM Boot Disks on Integrity Servers * Integrity boot process structures, concepts, and restrictions * Booting without LVM quorum * Booting to LVM maintenance mode * Integrity boot disk mirroring concepts * Mirroring a boot disk * Replacing a failed boot mirror * Creating a DRD clone * Creating a make_*_recovery archive * Resizing Integrity boot disk logical volumes Self study appendix: Configuring and managing PV links * PV link overview * Configuring PV links * Viewing, adding, and removing PV links * PV link switchover * PV link switchback * Configuring autoswitch behavior * Switching links manually * Optimizing PV links * Configuring PV links with SecurePath Self study appendix: Quiescing volume groups for use in snapshot LUNs * Snapshot concepts * Creating a snapshot * Recognizing a snapshot * Resolving duplicate VGIDs * Importing a snapshot volume group * Exporting a snapshot volume group Self study appendix: Creating and managing DRD clones * DRD concepts * Using DRD clones to minimize planned and unplanned downtime * Installing DRD * Using the DRD command * Creating a DRD clone * Synchronizing a DRD clone * Verifying a DRD clone’s status * Managing software via DRD-safe commands * Managing kernel tunables via DRD safe commands * Accessing images via other commands * Activating an inactive DRD image Self study appendix: Creating and managing logical volume snapshots * Snapshot concepts * Snapshot data sharing concepts * Data unsharing unit concepts * Fully allocated snapshot concepts * Space efficient snapshot concepts * Creating a volume group to accommodate snapshot volumes * Creating a fully allocated snapshot * Creating a space efficient snapshot * Removing snapshots and volumes * Snapshot Limitations * Snapshot volumes vs. split logical volume mirrors