HP StoreOnce 4430 HP StoreOnce Backup System Concepts and Configuration Guidel - Page 70
NAS shares, Operating system support, Backup application support, Shares and deduplication stores
View all HP StoreOnce 4430 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 70 highlights
10 NAS shares NOTE: It is important to understand that the HP StoreOnce network share is intended to be used ONLY by backup applications that "back up to disk". Do not use the NAS target device as a drag-and-drop general file store. The one exception to this rule is if you are using the NAS share to seed an appliance for replication. Operating system support Two interfaces are supported: • a CIFS interface for Windows networks • a NFS interface for Linux and UNIX networks See the HP StoreOnce Backup System user guide for more information about using the Web Management Interface to create and configure NAS shares as targets for backup applications. Refer to the UNIX and Linux Configuration Guide for more information about the NFS interface. Backup application support NAS shares may be used with most applications that support backup to disk, including embedded applications, such as Oracle RMAN and VMWare VCB Agent. For the most up-to-date information about supported applications, refer to http://www.hp.com/go/ebs. Shares and deduplication stores Each NAS share created on the StoreOnce system has its own deduplication "store"; any data backed up to a share will be deduplicated against all of the other data in that store, there is no option to create non-deduplicating NAS shares and there is no deduplication between different shares on the same StoreOnce appliance. Once a StoreOnce CIFS share is created, subdirectories can be created via Explorer. This enables multiple host servers to back up to a single NAS share but each server can back up to a specific sub-directory on that share. Alternatively a separate share for each host can be created. The backup usage model for StoreOnce has driven several optimisations in the NAS implementation which require accommodation when creating a backup regime: • Only backup files larger than 24 MB will be deduplicated, this works well with backup applications because they generally create large backup files and store them in configurable larger containers . Please note that simply copying (by drag and drop for example) a collection of files to the share will not result in the smaller files being deduplicated. • There is a limit of 25000 files per NAS share, applying this limit ensures good replication responsiveness to data change. This is not an issue with many backup applications because they create large files and it is very unlikely that there will be a need to store more than 25000 on a single share. • A limit in the number of concurrently open files both above and below the deduplication file size threshold (24 MB) is applied. This prevents overloading of the deduplication system and thus loss of performance. When protecting a large amount of data from several servers with a StoreOnce NAS solution it is sensible to split the data across several shares in order to realise best performance from the entire system by improving the responsiveness of each store. Smaller stores have less work to do in order to match new data to existing chunks so they can perform faster. The best way to do this whilst still maintaining a good deduplication ratio is to group similar data from several servers in the same store. For example: keep file data from several servers in one share, and Oracle database backups in another share. 70 NAS shares