Copyright © 2002 Legato Systems, Inc. Version: 1.0 Author: Shu-na Chu Doc d1795 Version: 1.0 Author: Shu-na Chu Doc d1795 8/11/2005 Legato Confidential Keystone/7.3 AFTD TOI

Legato Systems, Inc - Confidential and Proprietary 2 Introduction Prerequisites for attending this TOI session Overview and Benefits (3 features of 7.3 AFTD) Installation considerations How to configure/enable the feature Using the feature Licensing considerations Architecture and internal Design Debugging techniques and tips Questions and Answers

Legato Systems, Inc - Confidential and Proprietary 3 Prerequisites Admin Guide’s DiskBackup Chapter of 7.0 – 7.2 Original design docs on AFTD D1410 Advanced_file type Device D1435 DiskBackup Enhancements

Legato Systems, Inc - Confidential and Proprietary 4 Overview and Benefits #1: AFTD Concurrent recovers 7.2 introduced NetWorker recover via Direct File Access to AFTD (DAFTD) in CLI recovers when recover client can directly access/read from AFTD (filesystem) on UNIX In 7.2, when DAFTD is not available to CLI, recovers from AFTD are performed sequentially

Legato Systems, Inc - Confidential and Proprietary 5 Overview and Benefits (cont.) In 7.3, AFTD functionality extended to support concurrent recovers when DAFTD not available to CLI recover clients In 7.3 when recovering from AFTD via CLI recover, all save sets will be recovered concurrently, regardless of DAFTD’s availability

Legato Systems, Inc - Confidential and Proprietary 6 Overview and Benefits (cont.) #2: Sharing of an AFTD between storage nodes in NAS/SAN available since 7.0 when AFTD was introduced In 7.3, systematic configuration qualified & doc’d An AFTD created on a disk in NAS/SAN must be shared between same storage node platforms

Legato Systems, Inc - Confidential and Proprietary 7 Overview and Benefits (cont.) For NAS, NetWorker operations performed concurrently on two sharing storage nodes. one node can perform write (save) to RW volume while the other node performs read (recover or clone) from RO volume of the sharing AFTD.

Legato Systems, Inc - Confidential and Proprietary 8 Overview and Benefits (cont.) NAS: Concurrent operations on the storage nodes when sharing an AFTD Backups to SN w/ RW volume mounted Recovers from SN w/ RO volume mounted 1-clone fr SN w/ RO vol mounted 1-stage fr SN w/ RO vol mounted X X X X X X

Legato Systems, Inc - Confidential and Proprietary 9 Overview and Benefits (cont.) For SAN, NetWorker operations performed sequentially (one sharing storage node at a time). only one storage node can perform NetWorker operation(s) against the sharing AFTD at any given time. Staging occurs from the storage node with RO volume mounted (NAS/SAN)

Legato Systems, Inc - Confidential and Proprietary 10 Overview and Benefits (cont.) #3: Setting AFTD block sizes in KB via NSR_DEV_BLOCK_SIZE_ADV_FILE environment variable available (since 7.0) for customization or tuning NSR_DEV_BLOCK_SIZE_ADV_FILE n n >= 32, default is 128 [KB] 7.3: env variable doc’d & qualified

Legato Systems, Inc - Confidential and Proprietary 11 Overview and Benefits (cont.) Where to learn more D1795 AFTD Concurrent Recovers SRS D1658 NetWorker recover via Direct File Access to AFTD SRS LGTpa66725 attachment titled “howto_qualify_key4054.doc” for information on sharing an AFTD in NAS LGTpa66726/LGTpa Admin Guide DiskBackup chapter

Legato Systems, Inc - Confidential and Proprietary 12 Installation Considerations No Changes

Legato Systems, Inc - Confidential and Proprietary 13 Configuring the Feature (NAS example) No configuration changes to support AFTD concurrent recovers For sharing an AFTD between storage nodes (Example setup for NAS) UNIX, NFS mount the NAS filesystem for AFTD on the sharing storage nodes Windows, CIFS mapping to the NAS filesystem optional on the storage nodes

Legato Systems, Inc - Confidential and Proprietary 14 Configuring the Feature (NAS ex. contd.) Create & Label AFTD on storage node A UNIX: rd=sn_a:/shared_aftd Windows: rd=sn_a:\\nas1\path\shared_aftd with Remote user & password specified for NAS – NetWorker service started as adminitrator on sn_a Unmount both RW & RO volumes from storage node A (if mounted) Create same AFTD on storage node B UNIX: rd=sn_b:/shared_aftd on UNIX Windows: rd=sn_b:\\nas1\path\shared_aftd with Remote user & password specified for NAS –NetWorker service started as administrator on sn_b NetWorker mount AFTD on storage node B (to create RO volume) : must NOT label it on storage node B for sharing

Legato Systems, Inc - Confidential and Proprietary 15 Configuring the Feature (NAS ex. contd.) NetWorker unmount all volumes of the shared AFTD on the sharing storage nodes A & B To write (backup) to storage node A, NetWorker unmount RW volume from storage node B (if mounted), then NetWorker mount RW volume onto storage node A Setup Client’s “Storage nodes:” attribute Ensure server’s local storage node has volume available for bootstrap backup

Legato Systems, Inc - Confidential and Proprietary 16 Configuring the Feature (NAS ex. contd.) To read (recover/clone/stage) from storage node B, NetWorker unmount RO volme from storage node A (if mounted), then NetWorker mount RO volume onto storage node B Setup Client’s “Storage nodes:” attribute with sn_b to recover from sn_b, if needed Setup server client’s “Clone Storage nodes:” attribute for clone/stage, if needed Setup Stage resource/policy’s “Devices:” attribute to select rd=sn_b:/shared_aftd for auto-stage from storage node B

Legato Systems, Inc - Confidential and Proprietary 17 Configuring the Feature (SAN example) For sharing an AFTD between storage nodes (Example setup for SAN) Use appropriate OS or SAN command to unmount/undefine/disable the sharing disk from all machines, then mount/define/enable the disk onto storage node machine A Create, Label & Mount the sharing AFTD device on storage node A in NetWorker

Legato Systems, Inc - Confidential and Proprietary 18 Configuring the Feature (SAN ex. contd.) Perform backukp and recover/clone to/from storage node A (w/ “Storage Nodes” attribute setup in Client resource) Perform stage from storage node A (w/ “Devices” attribute selected for storage node A in Stage resource) NetWorker unmount the sharing AFTD (RW & RO) volumes from the storage nodes A

Legato Systems, Inc - Confidential and Proprietary 19 Configuring the Feature (SAN ex. contd.) Use appropriate OS or SAN command to unmount/undefine/disable disk from storage node machine A, and then mount/define/enable the same disk on storage node machine B Create the sharing AFTD in SAN for storage node B in NetWorker NetWorker mount the AFTD (to create RO volume) onto storage node B (must NOT label it for sharing with SN_A)

Legato Systems, Inc - Confidential and Proprietary 20 Configuring the Feature (SAN ex. contd.) Perform backup and recover/clone to/from storage node B (w/ “Storage Nodes” attribute setup in Client resource) Perform stage from storage node B (w/ “Devices” attribute selected for storage node B in Stage resource)

Legato Systems, Inc - Confidential and Proprietary 21 Configuring the Feature For any new block size of AFTD to take effect, must restart NetWorker daemons or services after [re]setting environment variable NSR_DEV_BLOCK_SIZE_ADV_FILE Eg., To reset AFTD block size to 64K UNIX: –setenv NSR_DEV_BLOCK_SIZE_ADV_FILE 64 Windows (may require reboot): –set NSR_DEV_BLOCK_SIZE_ADV_FILE to 64 via Control Panel->System->Environment Variable

Legato Systems, Inc - Confidential and Proprietary 22 Using the Feature No changes in CLI recover command syntax to support AFTD concurrent recovers No changes in how backup/recover, clone/stage is invoked to take advantage of sharing AFTD between storage nodes (after proper configuration)

Legato Systems, Inc - Confidential and Proprietary 23 Licensing Considerations N/A

Legato Systems, Inc - Confidential and Proprietary 24 Questions and Answers Any questions that have not been answered yet?

Legato Systems, Inc - Confidential and Proprietary 25 recover ss1 ss2 nsrmmd Disk/filesystem Architecture and Internal Design Concurrent recovers recover ss4 ss5 ss6 recover ss3

Legato Systems, Inc - Confidential and Proprietary 26 Architecture and Internal Design (cont.) nsrmmd’s AFTD recover functionality has been enhanced in 7.3 to be multithreaded to support concurrent recovers of AFTD to process each recover stream (save set) in a thread No code changes in 7.3 to support sharing of an AFTD between storage nodes & AFTD block size environment variable

Legato Systems, Inc - Confidential and Proprietary 27 Debugging Techniques and Tips How to obtain debugging or tracking information Use –Dn or –vvv.., such as: nsrd –D4 > nsrd.debug along with recover –vvvv –D4 … > recover.debug nsr/logs/daemon.log

Legato Systems, Inc - Confidential and Proprietary 28 Debugging Techniques and Tips (cont.) Common pitfalls you or the customer may encounter To share AFTD between storage nodes, ensure: Proper “Storge nodes:”, “Clone Storage nodes:” attributes setup in server client & appropriate clients’ resource Proper “Devices:” attribute specified in Stage resource for the storage node with RO volume mounted for auto-stage

Legato Systems, Inc - Confidential and Proprietary 29 Debugging Techniques and Tips (cont.) To share AFTD in NAS on Windows storage nodes, ensure: nsrexecd (NetWorker Remote Exec Service) started as administrator on storage node UNC path names for AFTD in NAS with appropriate Remote user and password specified for NAS, when creating AFTD –Example of UNC path syntax: rd=sn_a:\\nas1\path\shared_aftd

Legato Systems, Inc - Confidential and Proprietary 30 Known Issues and Limitations Known issues and/or bugs Description – RO volume may be auto- mounted onto the writing SN during save occasionally (may occur without sharing AFTD) Bug ID: LGTpa73962 Workaround(s) Unmount all sharing instances of RO & RW AFTD volumes from all storage nodes, followed by the appropriate mount

Legato Systems, Inc - Confidential and Proprietary 31 Known Issues and Limitations (cont.) Limitations on AFTD concurrent recovers Not available to Windows GUI recover (winworkr), use CLI recover on Windows Not available to non-file recovers, such as NDMP & NetWorker DB modules 7.2 or prior Windows CLI recover clients recovering from 7.3 AFTD storge node will still be performed sequentially

Legato Systems, Inc - Confidential and Proprietary 32 Known Issues and Limitations (cont.) Limitations on sharing AFTD between storage nodes in NAS/SAN NAS/SAN: Only supports homogeneous storage node platforms when sharing AFTD (ie, Windows with Windows storage nodes, or Unix with Unix storage nodes)

Legato Systems, Inc - Confidential and Proprietary 33 Known Issues and Limitations (cont.) NAS/SAN filesystem pre-req: Before deploying AFTD sharing in NetWorker, must check to ensure OS filesystem (dir/file) permission and sharing is setup properly between storage node machines for root or administrator user, to enable proper sharing of AFTD on the same filesystem Use OS command to create/copy/erase dir/files on the sharing disk (NAS, JBOD in SAN etc), to check sharing is possible at filesystem level between machines

Legato Systems, Inc - Confidential and Proprietary 34 Known Issues and Limitations (cont.) NAS/SAN: Must manually unmount the sharing RW or RO AFTD volume from one storage node before mounting onto another storage node to prevent potential volume state out of sync NAS/SAN: Must manually unmount all instances of sharing RW or RO AFTD volumes from all of the sharing storage node before re-labeling the sharing AFTD device to prevent potential data loss

Legato Systems, Inc - Confidential and Proprietary 35 Known Issues and Limitations (cont.) SAN: Only one storage node can perform NetWorker operations at any given time SAN: Must issue OS/SAN command to mount/enable the sharing disk on 2 nd machine after unmounting/disabling it from 1 st machine. This will ensure file/dir sharing of the same disk is supported or setup in SAN on the sharing machines to enable the AFTD sharing (sequentially) in NetWorker

Legato Systems, Inc - Confidential and Proprietary 36 Known Issues and Limitations (cont.) SAN: May need to manually mount the RO AFTD volume in NetWorker on the 2 nd sharing storage node (upon creating and mounting the AFTD first time on the 2 nd storage node)

Legato Systems, Inc - Confidential and Proprietary 37 Questions and Answers Any questions that have not been answered yet? Thanks for attending