Ronny,
What percentage full is the 10GB flexvolume?
If it is more than 85% full then you might be suffering from this bug
detailed on the Netapp support website....
http://now.netapp.com/NOW/cgi-bin/bol?Type=Detail&Display=156577
We were affected by this, but the upgrade to DataOntap 7.0.1.1 fixed it.
Cheers,
Stephen
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
Sent: 21 November 2005 10:50
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Poor performance backing up netapp filer via FC to
LTO-3
OK. Here are some more information:
We are using a FAS920 with ONTAP 7.0.0.1P7.
There are 28 disks with 73 GB and 28 disks with 146 GB capacity.
The disks are split up into two aggregates: 26 disks (73 GB) with
double parity are "aggr1" and 26 disks (146 GB) with double parity
are "aggr2". The flex-volumes are created within the aggregates.
The left over disks are spare disks (two for each aggregate).
I´ve dumped a 10 GB flex-volume and measured the system load this
morning. The tape writes up to 25 MB/s and the system load was approx
20%. The disks are nearly idle compared to the maximum of 130 MB/s i´ve
seen on the same volume.
And i am using brand new lto-3 tapes as well. And they have new
labels,too.
I will now open a case at netapp.... Perhaps this is a bug in
ONTAP 7.0.0.1P7....
> I've been out of the loop for sometime, spending most of my time on the
> other side of netapp filers.
> But somewhere in the back of my mind I seem to remember that lto3 uses a
> different type of tape compared to lto-2.
> If this is true then it could be the source of your problem.
>
> On the otherhand: what makes you believe that the backup performance
should
> increase when you replace the tape drive ?
> If the combination filer/filesystem can only supply 25MB/sec then it won't
> make a difference if you replace the drive with an lto4/5/6/7/whatever.
>
> You did not tell us the type of filer, the ontap version, the size of the
> volume, the raidsize, the raidtype,
> and the number of files/average size of the files being backed up. This
> would give a lot of information required to see if the filer is really
> performing badly or if the situation is normal.
>
> You should not forget that a tape drive is like a hose pipe, the larger
the
> diameter the more water can be transported, but it is your task to pump
> sufficient water into the hose pipe. ;-)
>
> Bye
> Ernie
>
> -----Original Message-----
> From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT
> EDU]
On
> Behalf Of Ronny Egner
> Sent: Saturday, November 19, 2005 11:11 AM
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> Subject: [Networker] Poor performance backing up netapp filer via FC to
> LTO-3
>
>
> Hi list,
>
> we are backing up our netapp filer by ndmp. The tape drive
> is connected via fibre channel. We upgraded the drive from lto-2 to lto-3
> recently. However: the backup performance havent changed since then
(approx
> 25 mb/s). The new lto-3 drive should come up with more than 50 mb/s....
>
> Any help ?
>
>
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