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Fixing LUN Misalignment on Physical Machines
by Philbert Rupkins 08 Jun '13

08 Jun '13

Hello Toasters, I found a ton of information regarding fixing misalignment issues in virtual environments. However, I am interested in how to resolve misalignment on a physical machine. The only way I am aware of is to create a new LUN and perform a host based copy of the data to the new LUN. Is this my only option or are there any other methods that require less overhead/downtime? Here is the situation: Server OS = Windows 2008 Server LUN Type = Windows 2008 Partition Type = MBR (W2K3) How did we get a W2K3 MBR partition out of a Windows 2008 server? We didnt. The LUN was originally created by a W2K3 machine while using an EMC storage array. The W2K3 server was eventually retired and the LUN was presented to the W2K8 machine. The LUN was then migrated to a NetApp array using a block for block mirror of the data from the EMC LUN to the NetApp LUN. Unfortunately, the NetApp LUN was created as a windows_2008 lun type because it was going to be used by a Windows 2008 server - this is where the mistake was made. So now, we have a Windows Server 2008 box with a disk using a 2003-MBR partition type on windows_2008 lun type. Again, I'd like to fix the misalignment issue in the easiest way possible. Creating a new lun and performing a host based copy of the data is doable but requires a fair amount of overhead. Just wondering if there is a more efficient way to resolve lun alignment issues with physical machines. Thanks! -Phil

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SAS port speeds
by Jeff Cleverley 07 Jun '13

07 Jun '13

Greetings, We have a stack of DS4243 shelves for a NearStore running SATA/BSAS drives. We will be getting some DS4246 with the 4TB FSAS drives. I know it is supported to put them in the same stack, my understanding is everything in the stack will drop to 3 GB/s speed. Since the HBAs run 2 ports on one chip, does that one chip control the speed for both ports A/B, or are they separate? Thanks, Jeff -- Jeff Cleverley Unix Systems Administrator 4380 Ziegler Road Fort Collins, Colorado 80525 970-288-4611

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growing a vol on vFiler that is a source in Vfiler DR relationship
by Iluhes 05 Jun '13

05 Jun '13

Hello Toasters, What is the best procedure to grow a volume on the vFiler that is a source in VFiler DR setup. Is there a need to break / queues replication somehow

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Performance Advisor Reporting on V-Series Initiator Ports?
by Philbert Rupkins 24 May '13

24 May '13

Hello, Anybody know if there is any way to report on a V-Series initiator ports from Performance Advisor? Looks like Performance Advisor only captures metrics for target ports on the NetApp. The best I can find is enabling the "hostadapter" metrics in a custom view. Would be nice if PA included an object for V-Series initiators out of the box along with some expanded counters. Hopefully I am just missing something. Thanks, Phil

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Boot version info.
by Jeff Cleverley 24 May '13

24 May '13

Greetings, I'm replacing a 3140 with a 3270 stand-alone NearStore replacement. The current 3140 OS is 8.1.2P3 and the new head shipped with 8.1.2. Is that going to be close enough for the system to boot from the old system root disk, or does it have to be an exact match? If there is a way to modify the boot config from the command line instead of pulling the compact flash, I'd be OK with that also. Thanks, Jeff -- Jeff Cleverley Unix Systems Administrator 4380 Ziegler Road Fort Collins, Colorado 80525 970-288-4611

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VM Virtual Disk Latency Versus NFS Latency on Filer
by Philbert Rupkins 22 May '13

22 May '13

Hello, This may be more of a VMWare question. From within Data Fabric Manager, I am seeing a spike in latency on a NetApp volume used as an NFS datastore. DFM shows a spike in NFS latency of 50 ms on the volume. However, a virtual machine's performance counters in vSphere show a spike in Virtual Disk latency upwards of 700ms for the same "latency event". Any idea what might account for this difference in latency reporting between the NetApp (DFM) and ESXi? I expected there to be some difference for obvious reasons but I didnt expect to see a difference of this magnitude. Thanks, Phil

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Hot adding DS14MK4 trays to existing loop
by Fletcher Cocquyt 22 May '13

22 May '13

This is something I've never had reason to attempt until now. We have a 3270 cluster (8.1.2) Head 2 aggr1 consists of these two multipathed DS14MK4 trays (IDs 1,2): http://i.imgur.com/821iN35.jpg We want to hot add another DS14MK4 trays racked right above (IDs 3,4): http://imgur.com/FlMxpyz I've read the 2011 DS14MK4 guide and verified the loop speeds are all set consistently and IDs are all unique. (note: trays IDs are 1-4 from bottom to top) Can I simply: 1 - remove the top two pairs of fiber and transceivers (these go to head 1 (partner)) 2 - daisy chain up from those vacated ports to new trays (3,4) 3 - plug the fiber and tranceivers back in on the top tray? We would then grow (effectively double) this aggr1's capacity What are the risks ? (2011 guide mentions panic's are possible with loop misconfig) (we have 60 VMs running on head 2 on a separate loop and aggregate) Any other tips appreciated thanks

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Oracle RAC on Netapp unstable under load
by Fletcher Cocquyt 20 May '13

20 May '13

Recently we have seen our Oracle RAC VMs reboot during netowkr and Netapp (Ontap 8.1.2 NFS) load correlated to our Friday 8pm full backup window start time. Initial strategies to prevent this include distributing RAC voting disks on different Netapp volumes, but I'd like to hear if others who have seen this have better solutions in practice? thanks, Fletcher

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Delaying 64 bit aggregate upgrades
by Jeff Cleverley 17 May '13

17 May '13

Greetings, Is there a way to go from 7.3.5 to 8.1.2 without having all the aggregates start doing automatic conversions to 64 bit? Our current filers are getting hit pretty hard. I think the OS upgrade will help, but I'm afraid the aggregate upgrades will generate too much disk activity and slow things down for a day or two. We have ~9 aggregates per head that are 10T or larger. Most of these only have one volume in them. The shared ones have a few volumes with 40M+ inodes in use. If I can upgrade the aggregates selectively it will make it less noticeable to the users. Thanks, Jeff -- Jeff Cleverley Unix Systems Administrator 4380 Ziegler Road Fort Collins, Colorado 80525 970-288-4611

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ONTAP 8.1.2P4 / Spike in Latency After Storage vMotion
by Philbert Rupkins 16 May '13

16 May '13

Hello, We were experiencing issues with large file deletes and spikes in latency from our Netapp filers. We run v3240's and FAS2240's. All are running 8.1.2GA or 8.1.1GA. The problem was only observed on those filers running 8.1.2GA. One operation that was observed to causing the problem consistently was Storage vMotions from an NFS datastore. In particular, the tail end of the Storage vMotion when the guest machine's files were deleted from the datastore seemed to trigger the problem. It looks like other people were experiencing the same issue. NetApp confirmed that a bug existed related to the deleting of large files. That issue was addressed in 8.1.2P3. We decided to deploy 8.1.2P4 as it included additional fixes related to deleting large files. Has anybody else deployed 8.1.2P4 yet? We just completed our deploy of 8.1.2P4 and it seems to have resolved the issue with large file deletes. We've tested a few Storage vMotions and removals of VM's with no issues thus far. If you are using 8.1.2P4, have you observed other issues? Thanks, Phil

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