Thanks Tim!
The thought here was that NDMP was "built for speed" and should be taking all it can get from the 10GbE pipe. I was wondering if I was missing some hidden setting that was capping or throttling or "nice"-ing the NDMP process.
From: tmac [mailto:tmacmd@gmail.com] Sent: Wednesday, February 20, 2013 9:31 AM To: Christopher S Eno Cc: toasters@teaparty.net Subject: Re: NDMP speed question
DUMPing data is historically a slow process. There is much more involved than simply
FTP'ing data to the NetApp.
The filesystem is walked inode by inode and archive bits are set among other things.
--> A highly fragmented data set will also slow down any potential dumps.
--> Wide directories (large file counts in a single directory) significantly slow down dumps
--> Small files slow down dumps.
*--> qtree dumps seem to be a little better for dump speed
--tmac
Tim McCarthy
Principal Consultant
http://dl.dropbox.com/u/6874230/na_cert_dma_2c.jpg http://dl.dropbox.com/u/6874230/rhce.jpeg http://dl.dropbox.com/u/6874230/na_cert_ie-san_2c.jpg
Clustered ONTAP Clustered ONTAP
NCDA ID: XK7R3GEKC1QQ2LVD RHCE5 805007643429572 NCSIE ID: C14QPHE21FR4YWD4
Expires: 08 November 2014 Expires w/release of RHEL7 Expires: 08 November 2014
On Wed, Feb 20, 2013 at 9:03 AM, Christopher S Eno s.eno@me.com wrote:
Hi,
In testing NDMP dumps over 10GbE, I am seeing it max out at 1.5Gb/s. Some here are thinking that NDMP should be using more of that pipe. Anyone know about, or have numbers of NDMP transfer rates over 10GbE? Any caps or thresholds in OnTap that keep NDMP from gobbling up resources on the controller? I have run tests over the 10GbE connection from controller to controller, 10k drives to 10k drives, sata drives to sata drives, and always 1.5Gb/s is the ceiling. FTP'ing data from server to server across the same 10GbE network shows rates of 2.5Gb/s or higher.
My NDMP options:
ndmpd.access all ndmpd.authtype challenge ndmpd.connectlog.enabled off ndmpd.data_port_range all ndmpd.enable on ndmpd.fh_node_retry_interval 250 ndmpd.ignore_ctime.enabled off ndmpd.maxversion 4 ndmpd.offset_map.enable on ndmpd.password_length 16 ndmpd.preferred_interface e1a (value might be overwritten in takeover) ndmpd.tcpnodelay.enable on ndmpd.tcpwinsize 65534
IF e1a configuration:
e1a: flags=0x5f4e867<UP,BROADCAST,RUNNING,MULTICAST,TCPCKSUM,NOWINS> mtu 1500 inet x.x.x.x netmask 0xffffff00 broadcast x.x.x.x partner e1a (not in use) ether 00:07:43:08:98:ae (auto-10g_sr-fd-up) flowcontrol none
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