HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 204

select cast(float(sum(bytes))/1024/1024/1024/1024 as dec(8,4)) as ""Backed up data in TB"" from summary where activity='BACKUP' and start_time>timestamp(current_date)-(7)days • Display backup volume in Bytes by node for the past 24 hours: select start_time, end_time, entity, bytes from summary where activity='BACKUP' and start_time>timestamp(current_date)-(1)days order by end_time • Display value of mount retention for the device class: Query device class q devc f=d • Display details on the TSM options: Query TSM Options q opt • Display detailed node information: Query q n f=d • Display if client side compression is being used (should be disabled if you want to run deduplication or even compression in the virtual library): q ac begint=-24 search="compressed by" • Display if collocation is turned on - it should be turned off for a virtual library: Query storagepool f=d EMC NetWorker This section includes both general and deduplication guidelines as well as other useful information for EMC Networker. Networker General Guidelines The following NetWorker guidelines apply to a VLS regardless of whether deduplication is enabled or disabled: • Tape block size: Set the tape block size to 256 KB (maximum supported size, 512KB is not sup- ported). Otherwise, NetWorker uses a block size based on the device type used. For example, LTO-2 is set by EMC to 64 KB, assuming that the operating system is configured for variable block size mode. You can experience metadata errors when setting a fixed block size on your initiator if the block size in the stinit.def file does not match the NetWorker block size, so set a fixed block size on your initiator in the stinit.def file that matches the NetWorker block size. Use the full number in the stinit.def file with a lowercase "k." • Disable multiplexing: Even though multiplexing is supported, HP does not recommend it for virtual libraries because the performance impact on restores and deduplication. Because you can create additional drives easily in the virtual library and allocate them to Storage Nodes as necessary, sufficient backup streams can be concurrently written without requiring multiplexing. To disable multiplexing, do one of the following: • Default pool: Set the NetWorker device "target sessions" for any virtual tape library tape drives that will be used by the Default pool to 1. • All other pools: Set the pool "parallelism" parameter to 1, which enforces one stream per vir- tual tape library tape drive when writing to a pool configured with this parameter. HP recommends using a non-default pool with the virtual tape library with the "parallelism" parameter, because NetWorker autochanger reconfigurations may delete and recreate devices, and resetting the "target sessions" parameter to the default of 4. 204 Virtual Library Systems