Seeding From A Dell DR Series System To An External Device Using CLI 1508079399drseries Whitepapers101 En Us
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Seeding from a Dell™ DR Series System to an External Device Using the Dell DR Series System CLI Dell Engineering August 2014 A Dell Technical White Paper Revisions Date Description August 2014 Initial release THIS WHITE PAPER IS FOR INFORMATIONAL PURPOSES ONLY, AND MAY CONTAIN TYPOGRAPHICAL ERRORS AND TECHNICAL INACCURACIES. THE CONTENT IS PROVIDED AS IS, WITHOUT EXPRESS OR IMPLIED WARRANTIES OF ANY KIND. © 2014 Dell Inc. All rights reserved. Reproduction of this material in any manner whatsoever without the express written permission of Dell Inc. is strictly forbidden. For more information, contact Dell. PRODUCT WARRANTIES APPLICABLE TO THE DELL PRODUCTS DESCRIBED IN THIS DOCUMENT MAY BE FOUND AT: http://www.dell.com/learn/us/en/19/terms-of-sale-commercial-and-public-sector Performance of network reference architectures discussed in this document may vary with differing deployment conditions, network loads, and the like. 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Dell disclaims proprietary interest in the marks and names of others. 2 Seeding from a Dell™ DR Series System to an External Device | August 2014 Table of contents 1 Understanding the seeding process ............................................................................................................................................. 5 2 Seeding data from a DR Series system and copying it to a replication target................................................................... 6 3 4 3 2.1 Preparing for seeding ............................................................................................................................................................ 6 2.2 Setting up a seeding export job on the source DR Series system ............................................................................. 6 2.3 Important notes about the seeding export process ...................................................................................................... 9 2.4 Export CLI flow ...................................................................................................................................................................... 10 Setting up a seeding import job on the target DR Series system......................................................................................... 11 3.2 Important notes about the import seeding process ................................................................................................... 13 3.4 Import CLI flow ..................................................................................................................................................................... 14 Synchronizing the source and target containers .................................................................................................................... 15 4.1 If a target container exists .................................................................................................................................................. 15 4.2 If the target container does not exist .............................................................................................................................. 15 Seeding from a Dell™ DR Series System to an External Device | August 2014 Executive summary This paper provides information about how to set up seeding from a Dell DR Series system to an external device through the Dell DR Series command line interface (CLI). This paper is a quick reference guide and does not include all DR Series system deployment best practices. For additional information, see the DR Series system documentation and other data management application best practices whitepapers for your specific DR Series system at: http://www.dell.com/powervaultmanuals 4 Seeding from a Dell™ DR Series System to an External Device | August 2014 1 Understanding the seeding process Seeding is a process that copies de-duplicated data from a DR Series system to an external device (typically USB), which is exported as a CIFS share. The seeding process comprises the following steps: 1. 2. 3. 4. 5. The device attached to a client machine is mounted using the CIFS protocol on the DR Series system; and, seeding is initiated, which copies the data (export) to the device. Once the data is copied entirely, the devices are later shipped to the location of the target DR Series system. The device is attached to another client at the remote site and mounted using the CIFS protocol on the target DR Series system. The data is imported to the target DR Series system. Once all of the data is imported, replication re-sync is initiated between the source and target DR containers. Since the data is already present on the target, the re-sync completes quickly after transferring the namespace with any other changes in data. Replication setup is ready between the source and target. The following diagram shows this process. Transfer the devices to target location Perform seed export Perform seed cleanup Yes Is INSYNC? Enable the replication relationship No 5 Perform seed import Seeding from a Dell™ DR Series System to an External Device | August 2014 2 Seeding data from a DR Series system and copying it to a replication target 2.1 Preparing for seeding Before the seeding process is started, you need to gather the following information. • • • • • 2.2 The names of the containers on the appliance that contain the data to be replicated (typically the containers for which the disaster recovery setup must be done). These container names are given as input to the seeding process. Name or IP address of the client machine on which the USB device is mounted. Name of the CIFS share (USB device) exported to the “outside world.” Credentials (including domain, if any) to access the client. A password (minimum eight characters) to use for encrypting the data on the device. This password must be input at import time to decrypt the data. Setting up a seeding export job on the source DR Series system The following steps describe the commands for setting up a seeding export job on the source DR Series system. 1. Create a seed export job by entering the following command. seed --create --op export [--enc_type] By default the data is encrypted; however, the encryption type is optional. This command would request a password that is needed for encryption as shown in the following example. (Note that this same password is to be given as input to the import operation, which verifies and decrypts the data.) 2. Once a seed job is created, the container whose data is to be seeded must be added to the job. If there are multiple containers, you can execute the following command multiple times to seed the data from all containers. seed --add_container --name 6 Seeding from a Dell™ DR Series System to an External Device | August 2014 3. To reference the device to which the seed data must be copied, enter the following command. (Note that only the shares exported by CIFS protocol are recognized.) seed --add_device --server --volume --username [--domain ] In this command, the parameters are as follows: • server name - the name of the client which exports the device as a CIFS share. • volume name - the name of the export share on the target server. The name is case-sensitive. • user name - credentials to access the share. Password is requested separately. 4. Once the add device is successful, you can cross check the configuration details by using the following command. This step is recommended before you proceed further. seed –show 5. Enter the following command to start the seeding process. seed –start The data copy begins and will continue until either the space on the device is full or all of the data of the containers added is seeded. 6. Enter the following command to monitor the seeding progress. If the “Seed status” has reached ‘FINISHED’, then the seeding of the containers given as input is complete. seed –stats 7 Seeding from a Dell™ DR Series System to an External Device | August 2014 If the status is shown as ‘Paused (Device full),’ then the share has no more space to copy the data. The device must be removed (using the commands, “seed –stop” and “seed – remove_device”) and a new device with free space can be added (using the command, seed – add_device). This scenario occurs when more devices are available, and seeding has to be continued. Adding a new device without deleting the job would continue to copy the data from where it was left. You can execute the command, “seed –start” to continue. The type of information in the output of the command, “seed –stats,” looks similar to the following example. 7. If seeding must be stopped for some time, or the device must be removed, you can execute the following command to stop all I/O to the seeding device. seed –stop 8. You can enter the following command to remove the device from the DR Series system to which the seed data has been written. It is recommended that you execute the command, seed –stop before removing the device. seed –remove_device 8 Seeding from a Dell™ DR Series System to an External Device | August 2014 9. If the data to be seeded is completely gathered and the seed job is complete, you can delete the job by entering the following command. seed –delete 2.3 9 Important notes about the seeding export process • If ‘seed –delete’ is executed, all of the information about the seeding job is removed from the DR Series system. If a new job is created for the same container, then it will copy all the data once again. • The seeding process does not require that data ingest be stopped; even to the container to which the data is seeded. This means the DR Series system can continue to function normally while seeding is in process. • If the external device runs out of space, you should enter the commands ‘seed –stop,’ ‘seed – remove_device,’ and then ‘seed –add_device’ to add the new device. Enter ‘seed –start’ to continue seeding to the new device or the same device after the data on the device is imported on the target. • If the seeding process encounters any errors writing to the device, then you should remove the device by executing the command, ‘seed –stop,’ followed by ‘seed –remove_device’. The device can be re-attached, or a new device can be attached. To start seeding after adding a device, enter the command, ‘seed –start’. Seeding at this point will continue from the point where it stopped earlier. If seeding is stopped for any reason, enter the ‘seed –stop’ command, which will stop all of the seeding I/O activity. To continue again, enter the command, ‘seed –start’. • You need to export the attached device through the CIFS protocol. It can be a Windows share or a share exported from a Linux machine using the Samba protocol. • During seeding, replication can be enabled as needed on the same containers to the same DR Series system or to different DR Series systems. • Seeding does not delete the data on the device. Data on the device can also co-exist with the seed data. It is optional to delete the data on the device to free up the space for accommodating seed data. Seeding from a Dell™ DR Series System to an External Device | August 2014 • 2.4 You are not required to seed the entire data. You can choose the amount of data that can be seeded, depending on factors like time, amount of external space available, and so on; and you can stop seeding accordingly. The residual data will reach the target during replication re-sync. Export CLI flow The following diagram demonstrates the flow of the data export using the DR Series system CLI commands. seed --create --op export No seed --add_container < … seed --add_device < … > Status Finished True seed --remove_device seed --stop seed --show FINISHED/No Space/Error Ready to seed? seed --start 10 Pending Check seed status seed --stats Seeding from a Dell™ DR Series System to an External Device | August 2014 seed --delete 3 Setting up a seeding import job on the target DR Series system The seed import process copies the de-duplicated data from the external device provided to the target DR Series system. The following steps describe the CLI commands you need to enter for the import job on the target DR Series system. 1. Create a seed import job using the following command. seed --create --op import This command requests a password, which is the same password defined at the time of data export. The password is used to verify and decrypt the data. 2. You can reference the device from which the seed data is to be read by using the following command. (Note that only the shares exported by the CIFS protocol are recognized.) seed --add_device --server --volume --username [--domain ] In this command, the parameters are as follows: • server name - the name of the client that exports the device as a CIFS share. • volume name - the name of the export share on the target server. The name is case sensitive. • user name - the credentials needed to access the share. The password is requested separately. 3. Once the device is added successfully, you can cross check the configuration details by using the following command. This step is recommended before you proceed further. seed –show 11 Seeding from a Dell™ DR Series System to an External Device | August 2014 4. To start the seeding process, enter the following command. seed –start The data copy begins and continues until all of the data from the device is completely read. 5. To monitor the seeding process, enter the following command. seed --stats The type of information in the output of the command, “seed –stats,” looks similar to the following example. If the seed status is ‘FINISHED,’ then the data has been completely read from the attached device attached. The device can be removed after issuing the command, ‘seed –stop,’ and a new device if present can be attached. 6. If you need to stop seeding, or the device needs to be removed, you can enter the following command to stop all I/O from the seeding device. seed –stop 12 Seeding from a Dell™ DR Series System to an External Device | August 2014 7. To remove the device from the DR Series system to which the seed data has been written, enter the following command. (It is recommended that you enter the command, seed –stop, before removing the device.) seed –remove_device 8. If the data gathering from all the devices is complete, you can enter the following command to remove the seed job completely. seed --delete 9. Once the import is complete, replication re-sync must be performed between the source and target DR Series system containers. Once replication reaches the ‘INSYNC’ state, execute the following command to remove any data that is left unaccounted from seeding. Seed –cleanup 3.1 13 Important notes about the import seeding process • The order in which the seed devices are attached makes no difference for the seeding process. • The data at source could have changed after the export process is initiated. This data is replicated during replication re-sync. • The command ‘seed –cleanup’ must be executed only after the replication is established between source and target. If it is executed before, the entire imported data set could be deleted. • If seeding has to be stopped for any reason, you should enter the ‘seed –stop,’ which will stop all seeding I/O activity. To continue, enter the command, ‘seed –start’. If an error occurs while reading the seeding device, you should remove the device using the command, ‘seed –remove_device,’ after stopping the I/O, and then re-attach the device. • If any device is lost, corrupted, or left unattached during the import process, the data in that particular device will be received at the time of replication resync and will not have any effect on the import process. Seeding from a Dell™ DR Series System to an External Device | August 2014 • 3.2 Once the data on the device is imported, the seed import process will not delete the data on the seed location. You could use the same data, or the device, to import the data on a different DR Series system if needed (for example, to setup cascaded replication). However, it is recommended that you remove the data after replication setup is complete. Import CLI flow The following diagram demonstrates the flow of the data import using the DR Series system CLI commands. seed --create --op import Yes No seed --add_device < … > Add another device? seed --show seed --remove_device seed --stop Ready to seed? FINISHED Pending seed --start 14 Check seed status seed --stats Seeding from a Dell™ DR Series System to an External Device | August 2014 seed --delete 4 Synchronizing the source and target containers Once seeding import is complete, two possible scenarios exist: • • 4.1 The target container already exists, or, The target container does not exist, and, therefore, a fresh replication pair must be created. If a target container exists If a target container exists, you should initiate replication re-sync between the source and target DR Series system containers. Since the data is already present on the target, the re-sync will complete quickly after transferring the namespace with any other new or changed data. Complete the following steps. 1. Enter the command: replication --resync --name --role 2. Wait for replication state to come to “INSYNC”. 4.2 If the target container does not exist If a target container does not exist, complete the following steps. 1. Create a container on the target DR Series system. 2. Enable replication between the source and target DR containers by using the following command: replication --add < … > 3. Once the replication status changes to ‘INSYNC,’ then both source and target have the same data. 4. Enter the following command on the target to remove unwanted data created by seeding: seed –cleanup 15 Seeding from a Dell™ DR Series System to an External Device | August 2014
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