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Dee12_978b23
47 Posts
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823
September 9th, 2008 11:00
Performance tuning NDMP backups
I'm trying to tune the performance of my NDMP backups. I'm using the decision tree on p.49 of "Configuring NDMP Backups on Celerra 5.6". Towards the bottom of the tree it recommends setting the nPrefetch parameter to 32. When I atttempt to change this parameter, it tells me 32 is "not in range". Any idea what's going on?
Dee12_978b23
47 Posts
376
0
Posted September 9th, 2008 13:00
server_param server_2 -facility PAX -info nPrefetch
server_2 :
name = nPrefetch
facility_name = PAX
default_value = 8
current_value = 8
configured_value = 8
user_action = none
change_effective = immediate
range = (1,8)
description = Number of tape records prefetched per worker threadDee12_978b23
47 Posts
376
0
Posted September 10th, 2008 06:00
OK thanks. I checked the 5.5 documentation and found the following:
name = nPrefetch
facility_name = PAX
default_value = 8
current_value = 8
configured_value =
user_action = none
change_effective = immediate
range = (1,32)
description = Number of tape records prefetched per worker thread
Apparently the maximum changed from 32 to 8 in version 5.6.
Peter_EMC
674 Posts
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Posted September 9th, 2008 23:00
This param is per default already at its maximum of 8.
It can not be increased over the max of 8.
I think you found a documentation bug.
I have asked for a change in the documentation