Please note: The following steps correspond to the information shown in Figure 1 (below). Please refer to Figure 1 while reviewing the steps outlined.

NetBackup 6.0 Backup Process Flow

1. Upon startup, nbpem obtains all of the Backup Policy information via 2. nbproxy process from 3. bpdbm. The currently configured Backup Policy information is used to create the job worklist for all scheduled jobs. The build_worklist function runs only once when nbpem starts up. Once this information is obtained, the nbpem worklist will be retained in memory. nbpem calculates when each job in the worklist is due to run and a timer is set to the due time for each job that needs be run. nbpem sets this timer for each job to track when the job is out of window. When the job is due, the timer expires and 4. nbpem issues a request to nbjm via pbx to schedule the backup using a job function of “job start”. The nbpem service is a job scheduler. 5. nbjm initiates a backup job by communicating with bpjobd and the job is added to the job list in the jobs database. The job will now be visible in the Activity Monitor. The job will initially be in a queued state, waiting for resources to be allocated. bpjobd receives both data and status for any internal job started by nbjm while external or foreign jobs handle their own communication with bpjobd. The nbjm service assigns, runs, executes, and starts jobs. If the job remains queued and the “out of window” timer expires, nbpem notifies nbjm to cancel the job. Normally, nbpem will wait for notification from nbjm that the job has either completed, or been cancelled. In either case, nbpem sets a timer in order to keep track of when the job is due next. Now that the job has been submitted to the job manager, nbjm, the checks for resources are made. This involves the NetBackup Resource Broker. 6. nbjm makes a request for resources to nbrb, the NetBackup resource broker, on the Enterprise Media Manager Server. The NetBackup Resource Broker (nbrb) is another component of the Intelligent Resource Manager that runs continuously on an Enterprise Media Manager Server. nbrb uses the PBX process to communicate with other IRM and EMM services. 7. The resource broker uses its associated nbproxy service to access resource consumption constraints from bpdbm on the Master Server. 8. This information includes configured policies and other attribute information such as max jobs per policy, max jobs per client, and max jobs this client. For a normal backup, 9. nbrb secures the physical resources from nbemm which can include storage units, tape drives, and media ids. 10. Those resources are then marked as reserved in the EMM database. PBX is again used for this communication. 11. nbrb will also request that EMM suspend avrd drive scanning on the assigned scan host. 12. Once the requested resources are acquired, nbrb notifies nbjm that resources have been allocated. The job will remain in a queued state until all of the resources are allocated for the job by nbrb. Once the resources necessary for the job have been acquired from the Resource Broker, nbrb, the job can go active. nbjm will send a message to bpjobd, activating the job in the Activity Monitor. 13. When the job goes active, nbjm on the Master Server communicates with the Media Server via vnetd to start bpbrm and pass the start job arguments to that process. 14. bpbrm starts the actual backup by using the client daemon, vnetd, to start the backup and archive program, bpbkar, on the remote Client. 15. On the Media Server, the backup and restore manager, bpbrm, starts the appropriate media manager process, bptm for tape and bpdm for disk. The bptm process on the selected Media Server will SCSI reserve the drive(s) and then 16. issue a mount request to ltid. 17. ltid will forward the robotic mount request to tXXd. The tXXd process spawns a child, which issues a drive unload and sends the mount request to tXXcd. The tXXcd process spawns a child to issue the robotic move medium command. The tXXd child polls the drive, waiting for it to become ready and returns to ltid, which updates the mount statistics in the EMM database and then returns to bptm. The bptm process opens the drive path, positions and starts waiting for write data. nbjm will communicate the job status information to bpjobd as necessary and also accept job requests from bpjobd such as; cancel, restart, and resume. 18. The bpbkar program sends information about files within the image to the 19. backup and restore manager, which then communicates with 20. bpdbm in order to create image records in image database. 21. bpbkar transmits the backup image through vnetd to bptm or bpdm as directed. 22. The bptm or bpdm process forks a child process for this non-localized backup, which receives the image and stores it block by block into a shared memory segment. 23. The original bptm process then takes the image from shared memory and directs it to the allocated storage media. After all Client data has been written, 24. bpbrm sends job completion information to nbjm via vnetd. 25. nbjm will send a message to bpjobd so that the Activity Monitor shows the job is now “Done”. 26. nbjm also triggers the release of resources for completed jobs, notifying nbrb by writing in the job progress log. 27. nbjm will report the job exit status to nbpem who will then recalculate the next due time of the job. Figure 1: NetBackup Process Flow Enterprise Media Manager Server Master Server

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24 Image File Information vnetd 18 13 Header File Information 19 14 vnetd bpbrm 14 18 Image File Information 14 18 15 23 22 Backup Image bptm bpbkar bptm Shared Memory child Backup Tape 23 21 Backup Image Request bpmount bpfis bmrsave Image 16 Active Client Data ltid Media Server Client 17 mount Please note: The following steps correspond to the information shown in Figure 2 (below). Please refer to Figure 2 while reviewing the steps outlined.

NetBackup 6.0 Restore Process Flow

1. When the user starts a restore, NetBackup receives the request from the Client’s bprestore program which sends a request to the request daemon, 2. bprd. This request identifies both the files and Client targeted for the restore. The request daemon spawns a child bprd process to handle the restore request. 3. The child bprd process queries the NetBackup images database via bpdbm to obtain the information associated with the backup. This will include the files and Client targeted for the restore, as well as media information which includes the mediaID and Media Server used for the backup. The Master Server then writes a neededimage file. 4. A child bprd will then communicate with bpjobd to initiate the restore job. The restore job should now show up in the Activity Monitor. Note that the restore job may show up as “Active” even before the resources have been acquired for the job. The request daemon then spawns a second child bprd process (MPX-MAIN-bprd) to handle the restore request. This MPX-MAIN- bprd child bprd reads the neededimage file to get restore requirements. 5. The MPX-MAIN-bprd process then uses vnetd to start the parent backup and restore manager, bpbrm, on the Media Server that holds the media on which the data requested by the restore resides providing the necessary information for the requested restore. 6. The bpbrm process on the Media Server initiates both a child bpbrm process and starts either a bptm or a bpdm process. The parent bpbrm passes necessary information to the child bpbrm. For external jobs such as a restore, resources requirements are determined during this pre-processing phase of the job. 7. The bptm process on the targeted Media Server will make a request to nbjm on the Master Server via vnetd, naming the media needed for the restore. The resources need to be allocated before the job can proceed. 8. The child bpbrm process initiates the tar process on the Client and establishes a connection between the NetBackup tar program on the Client and bptm or bpdm on the Media Server. 9. Now that the job has been submitted to the job manager, nbjm, the checks for resources are made. This involves the NetBackup Resource Broker. nbjm contacts the NetBackup Resource Broker, nbrb, on the Enterprise Media Manager Server, to make a resource request. 10. nbrb communicates with nbemm, to request, access, and reserve resources as specified by the restore job and other configuration information defined for this Client. 11. nbrb returns the resource allocation to nbjm. 12. nbjm passes the resource information retrieved by the nbrb service to bptm on the targeted Media Server. The bptm process on the Media Server obtains the location of the data which includes the media ID or file path and any other resource information necessary in order to perform the restore. 13. The bptm process on the selected Media Server will SCSI reserve the drive(s) and then issues a mount request to ltid. 14. ltid will forward the robotic mount request to tXXd. The tXXd process spawns a child, which issues a drive unload and sends the mount request to tXXcd. The tXXcd process spawns a child to issue the robotic move medium command. The tXXd child polls the drive, waiting for it to become ready and returns to ltid, which updates the mount statistics in the EMM database and then returns to bptm. The bptm process opens the drive path, positions and starts waiting for read data. 15. It then spawns a child bptm process, assuming this is a restore to a remote client. 16. During retrieval, the original bptm process stores the image block by block in shared memory while the child bptm process 17. delivers the data to the tar program on the Client, which writes it to disk. When the data has been restored, 18. The parent bptm sends the unmount request to ltid. 19. bptm will notify nbjm that the restore is complete. 20. nbjm communicates with nbrb to de-allocate resources. 21. The child bprd process removes the neededimage file and all processes exit, ending the restore. Figure 2: NetBackup Restore Process 2 1 Master Server mpx main Enterprise Media Manager Server bprd bprestore bprd 5 4 nbsvcmon child bprd 3 7 9 11 12 11 9 20 11 10 20 11 10 116 117 118 111 nbpem PBX nbjm PBX nbrb PBX nbemm PBX VxDAL 19 20 20 20

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NetBackup Job vnetd EMM Database Database Database

vnetd 5 8 7 19 vnetd bpbrm 12 8 13 6 7 12 19 Restore Image 8 bptm tar bptm Shared Memory 15 child 16 17 Restore 13 18 17 Restore Image Tape bprestore Request Image

18 unmount 1 Active Client Data ltid Media Server Client 14 mount