Expected NetApp NDMP Restore speeds from tape through NRS
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> Thanks for taking the time to reply.
I should have included in the original email that I turned DAR off for the restore.
-Jon
From: Luke <kaneda.san.sec < at > gmail.com>
Sender: commvault < at > yahoogroups.com
Date: Thu, 16 Dec 2010 12:22:35 +1100
To: <commvault < at > yahoogroups.com>
ReplyTo: commvault < at > yahoogroups.com
Subject: Re: [commvault] Expected NetApp NDMP Restore speeds from tape through NRS
Hi Jon,
Haven't tried this with NRS, but have you tried running the restore with
Direct Access Restore disabled?
I know when I'm performing large volume restores with Netapp filers (tape shared between CommVault MA's and Netapp filer) that DAR is only fast for smaller restores (generally 20-30% size of the volume) ... once I want to restore large blocks, say, the entire volume, then non-DAR restores are the way to go.
Supporting documentation here:
http://documentation.commvault.com/commvault/release_8_0_0/books_online_1/english_us/features/restore/nas_ndmp.htm#Direct%20Access%20Restore
Kind Regards,
Luke
On 16/12/2010, at 11:20 AM, Jonathan Studer wrote:
I'm testing a restore of a very large volume (1.9TB with 6.6 Million files).
We use NDMP Remote Server (NRS) on our MediaAgent (MA) to backup our filers over our lan.
I'm performing a restore from tape directly to a temporary volume on my filers FC aggregate.
This means the data is traveling from tape through NRS on the MediaAgent and to the volume.
Our tapes are LTO-3.
The only place I can think to get an idea of transfer rates is my expanding my library (In commcell console), right click the drive, select 'Show Throughput'.
The throughput is showing 5.0 MB/sec (17.5781 GB/hr)
Our filers have 2 bonded gig links for 2Gbps connection. MA has 4 bonded gig links for 4Gbps. None of these links are saturated, they actually see very little utilization of around 5% on filer and less during the day on our MA.
the MA and the filer have plenty of available CPU and memory. Filer IOPS are really low. Disk read/writes on MA are low.
Basically, none of my resources are taxed and the job is running very slowly. I performed the same restore last week from the maglib on the MA and the job completed in ~2 days.
At the current rate the job will take ~5 days.
Is this throughput to be expected?
Can anyone point me to CommVault Documentation that explains the throughput for restore in my scenario.
Hope this all made sense.
-Jon
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