High-water mark – Low-water mark

high-water mark: Percentage of disk space that, when filled, automatically starts the staging process.

In the High-Water Mark (%) attribute, type or select a number. This value is the point at which save sets should be staged, measured as the percentage of available space used on the file system partition that the file device is on. Staging continues until the low-water mark is reached

low-water mark: Percentage of disk space filled that, when reached, automatically stops the migration process.

In the Low-Water Mark (%) attribute, type or select a number. This is the point at which the staging process will stop, measured as the percentage of available space on the file system partition that the file device is on

The percentage fullness of the file system on which the file/adv_filetype device directory resides. Save sets are staged when the file system reaches a certain percentage of utilization (the high water mark), regardless of a save set’s age. Once staging begins, it will continue until the file system utilization has decreased to the specified low water mark

The following AFTD device capabilities and configuration options have changed in NetWorker 8.0:

* The read-only (RO) mirror de vice has been removed.

* The device name is now disassociated from its location, so the underlying storage can be reconfigured without deleting and recreating the device definition (this was true for Data Domain type devices, it is now true for AFTD devices as well).

* A B2D volume can now be shared among multiple devices, and on different storage nodes.

* Read/write concurrency has been significantly improved with the ability to run concurrent backup, recovery and clone operations, including multiple clone operations (subject to configuration settings and resource availability).

* Scalability has been improved by removing the bottleneck of all write operations to the volume going through a single process.

Differences between FTDs, AFTDs and DD Boost devices

Table Table 20 lists the functional differences between traditional file type devices (FTDs), AFTDs, and DD Boost devices.

Table 20 Differences between disk devices ( of )
Function or operation File type device (FTD) Advanced file type device (AFTD) DD Boost device
Create a device Device property windowSelect media type: file.

UNIX/Linux storage node: local or NFS only.

Windows storage node: local path only. CIFS is not supported for FTDs

· Device Configuration Wizard· Device property window

Select media type: adv_file.

UNIX/Linux storage node: local or NFS only.

Windows storage node: local or CIFS using UNC path or using NFS; Remote user, Password.

· Device Configuration Wizard· Device property window

Select media type: Data Domain

Storage location Specified in the Name attribute. Specified in the Device Access Information attribute. Specified in the Device Access Information attribute.
Concurrent operations:Recover savesets by using AFTD concurrent operations provides more information. No Yes Yes
Reclaiming or recovering space The nsrim program removes both aborted and expired save sets, once every 24 hours, after a savegroup is completed (if volume recycle is set to Auto). · Aborted save sets immediately removed.· The nsrim program removes expired save sets, once every 24 hours, from the media database after a savegroup is completed (if volume recycle is set to Auto). Space on the AFTD is removed at the interval defined in the Reclaim Space Interval of the staging policy. · Reclaims only data that is unique, not required by other existing backups.· Aborted save sets are not immediately removed, but marked recyclable. This allows deduplication if the save set is restarted. The aborted save set is removed during the next Recover Space operation.
Volume default capacity for devices If the file type device was used prior to setting the Volume Default Capacity attribute, the data for that file type device must be staged or cloned to another device. Does not apply. Does not apply.
AFTD Percentage Capacity Does not apply. A setting determines the capacity that NetWorker software should stop writing to an AFTD; spans from 1 to 100%. Does not apply.
When file system or volume is full · Waiting message displayed if no writable volume available or until volume becomes available.· Volume marked full and is no longer available for backups until the volume becomes appendable. · Message displayed stating file system requires more space.· The nsrim program invoked to reclaim space for expired save set on AFTD.

· Notification sent by email stating device is full.

· Device waits until space become available. The volume is never marked as full.

Backup to a DD Boost device fails and stops when full.
Save set continuation Yes No. Save sets that start on an AFTD must be completed on the same device. No. Save sets that start on a DD Boost device must be completed on the same device.
Data format in device EMC Open Tape Format (OTF). Save stream (uasm) format (uses less space). Deduplicated
Cloning operations Save sets are cloned one at a time. Both automatic and manual cloning can begin only after all the save sets in a savegroup are backed up. Save sets are cloned one at a time. Automatic cloning begins after the save sets are backed up. Manual cloning of a save set can begin as soon as it has finished its backup.Two simultaneous clone operations can be run from the command prompt, provided no backup, recover, or stage operations run at the same time. The syntax is as follows:

nsrclone -S [ssid/cloneid1]

nsrclone -S [ssid/cloneid2]

The EMC NetWorker Data Domain Deduplication Devices Integration Guide provides details for advanced CCR cloning and replication with DD Boost devices.
Client Direct backup:
the storage node manages the devices for the NetWorker clients, but the clients send their backup data directly to the devices via network access, bypassing the storage node.
No. Yes.Clients send their own backup data directly to the storage devices. If Client Direct backup is not available, a traditional storage node backup is performed.

Note: NetWorker archive operations are not supported for Client Direct backup.

Yes.Clients use DD Boost DSP functionality to deduplicate their own backup data before sending it directly to the storage devices. If Client Direct backup is not available, a traditional storage node backup is performed.

Note: NetWorker archive operations are not supported for Client Direct backup.

 

staging

Enabled – The enabled attribute determines whether or not save sets are automatically staged from devices associated with this policy.
Devices – Disk family devices controlled by this policy for the source of staging.
Destination pool – The destination pool of the staged save sets for this policy.
High water mark (%) – The point at which save sets should be staged, measured as the percentage of available space used on the file system partition that the device is on. Staging will continue until the lower mark is reached.
Low water mark (%) – The point at which the staging process should stop, measured as the percentage of available space used on the file system partition that the device is on. Staging will continue until the lower mark is reached.
Save set selection – save set selection criteria for staging.
Max storage period – Specifies the maximum duration for a save set in a volume before it is staged to a different volume.
Max storage period unit – Specifies the unit for Max storage period.
Recover space interval – The interval between recover space operations for expired save sets and save sets with no entries in the media data base from a device.
Recover space unit – Specifies the unit for Recover space interval.
File system check interval – The interval between file system check operations.
File system check unit – Specifies the unit for File system check interval.

 

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About Ahmad Sabry ElGendi

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