Advice on using NDMP Accelerated backup or not
Hello Everyone,
I am seeking for some advice on what should i be using to backup an emc Isilon using NDMP protocol. On this isilon i have millions of small files that i need to backup. About 70 % of those files are "cold files" but need to retain forever.
The isilon support NDMP level 10 (incremental forever) and since i am using version 8.1.1 i was wondering of what should be the backup setup for this ;
1) NDMP with accelerator and a Force rescan every 6 month + incermental for the rest ?
2) NDMP non accelerated backup with a full every year and incremental With level 10 the reste of the year ?
Should both FULL and Incermental be configured on the same policy or should i use one policy for each ? Any variable i should set in the policy ?
Thanks for sharing your thoughts on this.
With small files, it is not very likely you will be able to archive a high transferspeed. There may be speed gains by setting the OneFS NDMP maximum tape block size to 256K instead of default value. I would say a backup time of 554 hours for 33 TB is near unpractical setup. Furthermore - the speed from each share is about 45MB/sec, meaning you will wear tape drives down because of shoe shining.
Always keep full and incremental schedules in same policy, else Netbackup won't be able to refer the incremental backup to the full backup.
For reference about NDMP on OneFS: https://www.emc.com/collateral/TechnicalDocument/docu65070.pdf