I have been having some performance issues on my F880 the past couple of days. Specifically, an NDMP backup that normally takes 2 hours to complete was stuck in the mapping phase for 12 hours before I killed it.
What I am seeing is a high disk read, but without a corresponding network out. Here is a sysstat:
CPU NFS CIFS HTTP Net kB/s Disk kB/s Tape kB/s Cache in out read write read write age 62% 1456 6 0 794 16954 46326 0 0 0 4s 56% 1418 0 0 597 13689 36506 0 0 0 5s 64% 1737 3 0 867 17637 43572 0 0 0 5s 53% 1135 18 0 572 14823 42905 1155 0 0 4s 73% 2067 20 0 1282 37835 69880 6347 0 0 4s 69% 2031 24 0 1267 38868 67632 0 0 0 4s 74% 1921 3 0 1027 26644 50881 7778 0 0 5s 59% 1459 0 0 774 18843 41313 0 0 0 6s 60% 1212 2 0 665 16391 38766 0 0 0 7s 54% 1028 19 0 509 11873 33960 0 0 0 7s 61% 844 302 0 571 13765 39032 0 0 0 7s 72% 1164 598 0 1870 16750 39968 0 0 0 5s 71% 948 640 0 8961 9788 29552 0 0 0 5s 79% 1297 603 0 24157 5831 26034 0 0 0 4s 87% 2130 465 0 23581 9794 31269 0 0 0 2s
I don't know why the disks are reading so much without it going out the network.
This is an F880 running OnTap 7.1. It is somewhat full -- about 92% (1.2TB out of 1.3TB).
There isn't any stuck ndmp sessions:
ndmpd status
ndmpd ON. No ndmpd sessions active.
I haven't really looked at what clients may be doing what due to the low network out numbers- but I am going there next.
Does anyone have any suggestions on what to look for ?
Thanks,
Paul