Hi everyone, I have encountered a problem with a NetApp filer F720. I get a very very low throughput from the filer when i try a backup to a StorageTek tape connected to it, the throughput being 6 MB/min. And, i have known from some other NetApp users that the filer can give a max of 45 MB/min. If i connect the same tape to some other windows m/c and do the backup, the throughput rises to 116 MB/min and keeps increasing thereon. Now, i tried both local and remote backups to the tape. I did a backup of data from the disk on the filer to a tape locally connected to it. Also, i tried a remote backup of data from a remote m/c to the tape. The throughput in the 1st case was 13 MB/min while for the second, it was 6 MB/min. I have considered any network congestion that might cause a low throughput, but a remote backup to a tape on a windows m/c was pretty high (116 MB/min), which only leads to that probably the filer's is reducing the throughput.
I need help in figuring out where the problem lies. To my conjecture, i believe it is the filer thats somehow spending a lot of time reading and writing from/to the tape.
Any suggestions are welcome. I look forward to a lot of replies.
Thanks a lot, Sonia.
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did you tried to make a sysstat during the operation ? sysstat 1 would give you CPU consuption of the Filer if it reach 100% then, your Filer is not powerfull enought what about the version of your Ontap ? version and how the netapp see the tape ? sysconfig -t sysconfig -m what device do you use ? ie what is the dump command you execute ?
Harbhajan Julka wrote:
Hi everyone, I have encountered a problem with a NetApp filer F720. I get a very very low throughput from the filer when i try a backup to a StorageTek tape connected to it, the throughput being 6 MB/min. And, i have known from some other NetApp users that the filer can give a max of 45 MB/min. If i connect the same tape to some other windows m/c and do the backup, the throughput rises to 116 MB/min and keeps increasing thereon. Now, i tried both local and remote backups to the tape. I did a backup of data from the disk on the filer to a tape locally connected to it. Also, i tried a remote backup of data from a remote m/c to the tape. The throughput in the 1st case was 13 MB/min while for the second, it was 6 MB/min. I have considered any network congestion that might cause a low throughput, but a remote backup to a tape on a windows m/c was pretty high (116 MB/min), which only leads to that probably the filer's is reducing the throughput.
I need help in figuring out where the problem lies. To my conjecture, i believe it is the filer thats somehow spending a lot of time reading and writing from/to the tape.
Any suggestions are welcome. I look forward to a lot of replies.
Thanks a lot, Sonia.
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