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13514 discussions

Curiosity killed the NetApp admin: Empty lun not empty
by Peta Thames 30 May '12

30 May '12

Hi all, I have a question born mostly out of curiosity but also slight paranoia. I don't know VMware very well so forgive me if I'm missing something obvious. I have a VMware lun that is thin-provisioned and presented via FC. vSphere reports that the lun has no VMs in it, and yesterday I deleted the datastore from VMware. It was only mapped to one cluster. The lun is currently offline and no-one's complained (yet). On the filer, it reports that the lun occupies 962.9gb of its 1tb. Surely it should be empty? There are no snapshots. We don't use snapmirror. Fractional reserve was set to 100 but I've since set it to 0 and it made no difference. I haven't been here long so I don't know any more history I'm afraid. Any ideas? Thanks, Peta P.S. If anyone was curious about my last email sent to this list re reallocation and de-duped volumes, I can't get a detailed answer from NetApp support aside from "generally, don't reallocate de-duped volumes". So that's what I'm doing (or not, so to speak).

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Poor NFS 10GbE performance on NetApp 6080s
by Dan Burkland 29 May '12

29 May '12

Hi all, My company just bought some Intel x520 10GbE cards which I recently installed into our Oracle EBS database servers (IBM 3850 X5s running RHEL 5.8). As the "linux guy" I have been tasked with getting these servers to communicate with our NetApp 6080s via NFS over the new 10GbE links. I have got everything working however ever after tuning the RHEL kernel I am only getting 160MB/s writes using the "dd if=/dev/zero of=/mnt/testfile bs=1024 count=5242880" command. For you folks that run 10GbE to your toasters, what write speeds are you seeing from your 10GbE connected servers? Did you have to do any tuning in order to get the best results possible? If so what did you change? Thanks! Dan

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ONTAP & IPv6?
by Fredrik Pettai 29 May '12

29 May '12

Hi, IPv6 support in ONTAP has be there for a while, but is anyone really using it? and in production? I asked NetApp (the local Swedish office in Stockholm) and they tried to asked both their integrators and internally in NetApp worldwide to see if anyone knew about any customers running ONTAP and IPv6 enabled, but only got "no" as answer or no feedback at all. That was disappointing... So does anyone on the list run IPv6 on their NetApp(s)? or know of any other NetApp customer that enabled IPv6? We're starting to use it (on ONTAP 8.1 GA), but it would be comforting if we where not the only ones using it... Thx, /P

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Diagnosing outage on FAS6040 running 8.0.1 7-mode
by Steve Losen 25 May '12

25 May '12

Hello Toasters, We had an incident where a FAS6040 running 8.0.1 gave very slow response to a variety of requests. This resulted in a bunch of Linux VMs experiencing failed disk I/O requests, which resulted in corrupted local Linux filesystems. One Linux VM logged that it waited 180 sec. for a disk I/O to complete. The filer did not reboot, and recovered on its own, but we are very interested in figuring out what happened and if we can avoid it (known bug?, should we upgrade ONTAP?) This 6040 does a variety of jobs -- NFS server for a Communigate Pro email system, NFS volumes for VMWARE, and it even has a few FC SAN LUNs used by sharepoint. In general it does not appear to be overloaded. It's been up for over 300 days with no problems. The CF partner filer experienced no problems at that time and it also holds VMWARE volumes and mail volumes. At the time of the outage the /etc/messages file indicated a slow NFS response (93 sec) to one of the Communigate servers. It also indicated that a FC LUN was reset by the sharepoint server. I'm guessing due to delayed response. The mail and sharepoint volumes are in the same aggregate. I see three resets for the LUN in /etc/messages. I looked in /etc/log/ems at about the time of the outage (Tue May 22 17:30 EDT) I see that a raid scrub of a raid group in the mail/sharepoint aggregate completed with no errors. I also see wafl_cp_toolong_warning_1 and wafl_cp_slovol_warning_1 for a different aggregate (which contains VMs). I see several of these, which I presume are caused by slow completion of CPs. I don't know if these caused the problem or were caused by the problem. Anyone have any suggestions for further investigation or diagnosis? Any other logs to look at? Everything is fine now and has been running fine since the outage. Thanks, Steve Losen scl(a)virginia.edu phone: 434-924-0640 University of Virginia ITC Unix Support

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Two semi-related questions - Adding a shelf, and FC config
by Justin Popa 24 May '12

24 May '12

I put in a FAS2020HA last year, and we're looking to do a little expansion. We currently just have the base unit, with 600GB SAS drives. We'd like to add a shelf for our testing environment. We asked for a quote from our reseller but it was astronomical, so we've looked into the used market. Other than the added equipment not being covered by my service & support contract, is there any issue buying a ds14mk4 and installing it? Assuming I do add it, I need some help figuring out my fiber connections. We're currently NFS, but I've recently procured some HBA's, as well as switches. To make things more interesting, we currently do our backup over fiber to an HP Autoloader connected directly to the first filer. Here are my concerns: 1) I've been told that you can't put a tape backup on a fiber switch with a netapp. True? If so, can I just leave it connected to filer A, and then only connect the second FC port to the switch? I know I'm looking at a point of failure there, but that would be temporary until we change our backup infrastructure. 2) Can you hang a shelf off a fiber switch as well? Is there any concern of doing that given question 1?

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encrypted SMB traffic?
by Randy Rue 23 May '12

23 May '12

We've had a request to consider providing encrypted access to a CIFS filer. From the quick search I've done so far it appears that SMB itself doesn't provide any encryption options so instead we'd need to use IPSec at the filer and workstation ends. I've found NetApp man entries for the commands to manage this. Before I dig too deep into this, I'm hoping to get a feeling of whether anyone is using this in the real world. If so, how hard is it to set up? Is there a significant performance overhead? Any other gotchas? Hope to hear from you, rrue

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Im Hiring!
by Jeff Mohler 22 May '12

22 May '12

If you are a high end, super skilled, deductive reasoning data and storage guy overflowing with awesome, I may have an interesting opportunity for you in Field Performance. SF Bay Area Location. Please do NOT contact me thru the list, but Pvt Email at jmohler(a)netapp.com So lang und Dank für alle Fische --- I drank what?

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Cluster Notification from filer-a (SCHEDULED SNAPSHOT CREATE FAILED) CRITICAL
by Randy Rue 18 May '12

18 May '12

Hello All, Got this autosupport from our FAS3020 running 7.2.4. We use the "vol options VOLXX schedsnapname create_time" so that snapshot names reflect when the snapshot was taken, and the autosupport email contains the line: VOLXX - hourly.2012-05-16_1200 : Snapshot already exists. Trying to take a snapshot twice? Failing to roll off an old one? Just noise? I've STFW'd a little but I'm not finding anything like this. Hope to hear from you, Randy

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LUN migration and consolidation
by Milazzo Giacomo 18 May '12

18 May '12

Hi all, I have the following situation. Source file system: an AIX volume created on hundreds of very small LUNs (HDS storage array, something like 15 GB each!) Destination file system: a "mirrored" one to online migrate using LVM with no disruption on services but at the same time consolidating on a single LUN on NetApp (as you know the geometry is completely different!) In the past I did it but on a 1:1 relationship between source and destination LUNs. Not there's somebody stating that on AIX this is not possible... ?!? But this is possibile on any distribution of Linux too!!! My idea in other words is to map the new space to the same AIX host that will use to create a sort of R1 between file systems (Veritas Volume Manager also doed this i.e) regards

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Rate Limiting an NFS client
by Steven Kreuzer 18 May '12

18 May '12

Offhand, does anyone know if 8.1 has the ability to do rate limiting for nfs traffic? I have been asked to configure a filer so that nfs traffic from a certain ip addresses will not be able to exceed a maximum transfer rate while other clients will not be subjected to a maximum transfer rate I am aware that this can be done with ACLs on a switch, but management's would prefer to do it on the filer side if possible. Many Thanks -- Steven Kreuzer

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