Buffer Delay in our new Netbackup Environment is this normal?
Hi, I'm running a new NBU (10.1.1) environment, and we have struggled with the fine tuning of NBU slow performance. It has been 9 Days now since we started the implementation and finally we kinda have some performance improvement. Though, I wanted to ask if this can further be improved? Previously we came from MF DP 10 (Prev. HPE) - my autoloader does not stops and idle then after a few seconds it writes again. I have already approached Veritas Tech support team for assistance but the solution they provided made my backup ran slower both writing and elapsed time. Our Environment: Both servers are HPE DL380 Gen 10 / Media Library attached to the Media Server is HPE Store-Ever 1/8 Gen 2 (LTO-8) 300MB/s Native write speed to tape, / SAS Cable Transfer rate: 6.2GBps Master server is on a separate Window Server 2016. 64GB Ram 8TB Data storage free space. Media/Client server is on a same Windows Server 2016 with 256GB Ram and 28TB storage capacity. Right now I'm are running Full Backups every night. We modified these settings in the Veritas\db\config directory: Modified the following settings with these values: (This is the best we can do right now) * CHILD_DELAY = 5 * NUMBER_DATA_BUFFERS = 512 * PARENT_DELAY = 3 * SIZE_DATA_BUFFERS = 1048576 And we have around 4.2TB of Data to backup and it now takes about 6 and a half-hours to complete. But without the optimization using all default values it took around 21Hours to complete. I read in another Vox Article that delays and buffers are bad for Autoloaders, since they are not designed for STOP/WRITE functions, which could damage both the tape and drive. I would appreciate if you can provide a link for buffer / delay tuning guide for my environment. Media server is writing directly to the connected autoloader (HBA SAS Cable). I consulted with an HPE Server / Autoloader Engineer, according to him, there are no settings to configure on the Autoloader front panel control itself. Everything is controlled and configured by software (i.e. Backup Software - NBU) which means fine tuning the NBU to improve the performance and minimize the delay. Appreciate if you can give provide help and advice. Thank you and Regards,