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Posted on 2007-11-25
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Hi,

I received my F-250 NetApp storage device, I am very new to this system, and I never used them before. I have the following questions and your help is much appreciated:

1- I will host many applications file to the netapp (oracle database files, control files, windows users files, linux files), the guy who installed the netapp for us used one aggregate with RAID4, one spare disk and one parity. Is this setup good for my case?
2- Which is better for Oracle, NFS mount or Iscsi? I am running RedHat 4E.
3- What is the best practice to use snapshots? Any documenation? What is the best size?
4- Does the snapshot make an exact copy of the volume or only delta version? Is 20% enough?
5- How I can configure multipath for linux? Which means I have my oracle database files hosted in netapp volume, I need to be able to reach these files from different paths, in case on path went down I can go to other path (system will automatically)? how I can do that?

6- Can I share a lun with multiple Windows servers using ISCSI?

7- Why should I get Snap Manger for Oracle since I have snapshot?

Thanks
Rami
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Question by:nammari
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by:omarfarid
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1. How many disks are there in the system ? Depending on this, RAID-DP may be a better solution that RAID4, because RAID-DP has a much higher fault tolerance, but it requires 2 parity disks.

2. You should definetely choose for Oracle on NFS, this will guarantee better performance and is more fault tolerant than iSCSI.

3. You can take snapshots every hour, day or week and keep up to 255 snapshots online. This doesn't affect performance but this will require more storage. We typically keep 1 week of hourly snapshots online, 30 days of daily snapshots and 3 to 12 months of weekly snapshots depending on the application, but you can do whatever you want.

You'll find background documentation on www.netapp.com->library->technical reports and the manuals on the webinterface of the FAS.

4. Snapshots on a NetApp don't make a copy of the data, but store only changed blocks. The "snapshot reserve" is only a placekeeper to make sure you don't run out of place to take snapshots, but you can set this to zero without any serious consequences.

5. If you use NFS, all you need to do is build a fault tolerant network connection, e.g. by using network adapter teaming on your server and virtual interfaces (= also teaming) on the Netapp. Configure your switches for teaming and failover.

6. LUNs can only be "shared" in very special circumstances, e.g. for clustering, because by nature a LUN is dedicated to one server only. If you want to share files between Windows servers, use the NetApp CIFS to export file shares to the servers.

7. To create consistent snapshots, you'll need to do some scripting on your host (see the Whitepapers for Oracle on Netapp) . If you're not comfortable with this, you can buy Snap manager for Oracle, which manages the taking and restoring of snapshots.





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