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Re: Technical deepdive documentation on Snapshot Technology

March 9, 2018, 4:31 am
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Sure. We are seeing 2 things:

 

 

1) When we upgraded from 7 mode to C-Dot, the size of our daily snapshots for our biggest volumes increased by a factor of 10, a huge increase (hence an oversized snapshots issue). We've yet to understand why.

 

2) On other volumes, we are seeing deletions that don't tally with snapshot sizes. eg 100GB+ of data deleted, but resulting in a 100MB snapshot (so an undersized snapshot issue).

 

I won't go into too much detail at this point, as we are still undergoing testing, especially with the second issue that has only recently come to light.

 

This is why we are looking for some deepdive documentation to cement our understanding of snapshots at a technical level, so we can better engage support.

 

 

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Re: Technical deepdive documentation on Snapshot Technology

March 9, 2018, 5:05 am
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When you say upgrade, did you to a Copy Free transition or use TDP mirrors to migration or use a client side tool to do migrations

 

And is the data just file system data or Vms or databases.

 

Netapps snaps have been around forever, so you as for a deep dive, it's simple change blocks get put to snaps, and should be 4k increments

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Re: Technical deepdive documentation on Snapshot Technology

March 9, 2018, 5:53 am
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Re: How many IOPS can FAS8080 handle

March 9, 2018, 5:59 am
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Re: Following Symbolic Links which are outside a CIFS share

March 9, 2018, 6:04 am
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I didn’t get an answer, but I did find a resolution to my problem

 

When creating the symlink I needed to use the freelink option.

The freelink option is not available via the GUI so use the cifs symlink create command with the -locality freelink

This gave me the symbolic link functionality I required within a CIFS mounted drive

 

Example

 

cifs symlink create -unix-path /rel/ -cifs-path /vol/release/rel/ -locality freelink

 

where the /rel NFS mount point resolves to /vol/release/rel

 

Note :  I also believe the share ( in this case pc_rel )  has to be modified as follows

 

cifs share modify -share-name pc_rel -symlink-properties symlinks-and-widelinks no-strict-security

 

The above information should provide you the information for you to resolve your problem

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Re: How many IOPS can FAS8080 handle

March 9, 2018, 6:20 am
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Guys.

 

this is not straight forward. sit with your SE on their sizing tools and do the calculation with them.

 

 

in https://www.netapp.com/us/media/tr-3838.pdf  page 21 is saying a 15K SAS disk can do 176 IOPS on the back-end.

we don't know how you building your system with these 72 disks (spares?, raid type? ,raid groups count?, root aggregate?)... 

 

the calculation you'll get from that is your bottleneck on the back-end. but the front end activity can look completely different with caching, dedup. compression, in-memory activity (especially for NAS use),background activities...

 

Gidi

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Re: Technical deepdive documentation on Snapshot Technology

March 9, 2018, 7:40 am
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JGPSHNTAP,

 

We did a copy free transisition using the 7MTT tool.

 

Yes this is NAS filesystem data, no VMs no databases.

 

Whilst snapshots may be simple "in theory", there is a lot more to snapshots than just recording changed blocks. For example how space utilization is calculated, when it is calculated, what is classed as a changed block, and system content that exists in a snapshot that you can't even see e.g. /.copy_offload/.tokens etc.

 

That's why we're looking for documentation to gain a better understanding of how this works at a lower level, if it exists

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Re: Technical deepdive documentation on Snapshot Technology

March 9, 2018, 7:46 am
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GidonMarcus,

 

Thanks unfortunately this is just generic content. The section on "working with snapshots copies in Ontap 9.x" only covers configuring policies, managing snap reserve and snapshot recovery.

 

There's nothing there concerning technical "deepdive" documentation.

 

I'm really looking for a TR-*  type document I guess. I couldn't find one on snapshots, so thought i'd ask here in case anyone can point me to one!

 

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Re: .snapshot directory not visible in Windows Explorer, but it is in Command Prompt

March 9, 2018, 9:14 am
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Have you tried looking at the "snapdir-access" option on the volume? 

 

volume show -fields snapdir-access

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Re: Ontap 9.1 Upgraded 2240 upgrade not complete ?

March 11, 2018, 11:44 pm
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Re: How many IOPS can FAS8080 handle

March 11, 2018, 11:48 pm
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As Gideon says - it is not a straight forward answer, nor a straight forward question - there are literally more than 50 different variables that goes into sizing, including read/write sizes, random vs sequential read vs write, concurrency of workloads, access protocols, version of ONTAP, etc. Depending on this data, it could be 400MB/sec to 950MB/sec, with 11,000 to 130,000 IOPS or more.

 

If you are concerned that your existing system is running slow, please open a support case and we will investigate.

 

If you are looking for a sizing for a workload as part of a potential purchase, you need to work with a solutions engineer from NetApp directly as part of the sales process. 

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Perfstat 8.4 hang during gethering data.

March 11, 2018, 11:51 pm
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Hi.

 

I run perfstat8 (GUI, CMD, Linux CLI) at 9.0P2 AFF8080 system. but everytimes perfstat hang during on command "netstat -BMn" , one or two times it (netstat -BMn) passed well but two or three times processing this command (netstat -Bmn)

 

I tried more than 10 times , but always hang on "netstat -BMn"

 

sometimes perfstat8 hang during this processing " No Profile domain is provided at commandline hence skipping the command"

 

Host system OS is windows2008 R2 and Windows2012 server and CentOS Linux 6.

 

should I try on windows 7 or windows 10?

 

I can't find the reason. is there somebody have an experiance this? or is there somebody know the reason?

 

Help~ Me ~~~

Smiley Happy
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Re: Perfstat 8.4 hang during gethering data.

March 12, 2018, 4:50 am
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Hi savander,

have you tried setting up a preset file to exclude "netstat" commands from collection? Please check KB https://kb.netapp.com/app/answers/answer_view/a_id/1014577/ for how to do that.

Also pay attention that the collection host should be on the same network as the cluster, avoid a lot of network hops or latency between host and cluster.

 

Lorenzo.

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Re: Multiple EMS Events : None of the LSA servers configured for Vserver are currently acessible

March 12, 2018, 4:57 am
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Hi krishna556 and Dr_Goldman,

what version of ONTAP are you currently using? This might be an instance of BURT 1041972, in which case it is an internal ONTAP issue which is addressed starting with ONTAP 9.1.

If you confirm that there is no issue accessing the data from the clients, then it can also be safe to ignore those messages.

For further information please see https://kb.netapp.com/app/answers/answer_view/a_id/1005337.

 

Lorenzo

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Re: Multiple EMS Events : None of the LSA servers configured for Vserver are currently acessible

March 12, 2018, 7:07 am
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Re: picdat v0.2: now supports cdot perfstat data collections

March 12, 2018, 8:21 am
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Hi everybody,

 

the tool PicDat developed further. Now it supports also ASUP Performance data for ontap 9.1.

Just have a look at GitHub...

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Epsilon and root move from an aggregate to anoter

March 12, 2018, 10:31 am
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Hi everybody,

 

past friday during an operation given as NDO we've had a service interruption on NAS component.

We had to move the root aggregate from some old disks to new ones and we've literally followed the procedure reported here (our cDOT is 8.3.2P9)

 

https://kb.netapp.com/app/answers/answer_view/a_id/1030179

 

In a very simple way it says:

 

  1. Check for epsilon on the node you've to migrate and move it to another node
    • there's a warining about SAN protocols interruptions but we DID NOT have SAN protocols running, only NFS/CIFS.
  2. Lif migration after the aggregate relocation

Well, NFS was restarted and all servers and apps belonging to it went down! I let you imagine customer reaction...

Also console after this command:

             system node modify -node node01 -eligibility false

give us a warning about SAN disruption. As I wrote it did not matter us.

 

Only after that we've found on manual this, but as usual manuals are always less updated than knowledgebase so it could be the last place where to find fresh informations!

https://library.netapp.com/ecmdocs/ECMP1367947/html/GUID-AB52F821-3A25-4E02-B1EF-1B09EBE4009D.html


Moving epsilon for certain manually initiated takeovers

 

Note: Although cluster formation voting can be modified by using the cluster modify -eligibility false command, you should avoid this except for situations such as restoring the node configuration or prolonged node maintenance. If you set a node to be ineligible, it stops serving SAN data until the node is reset to eligible and rebooted. NAS data access to the node might also be affected when the node is ineligible.

And, what does it mean "might be". I translate that as a "nobody knows, try..." Smiley Sad

Now the most important question (we must migrate other three nodes!) is this:

Assuming that we've well understood that 1. migrate lif and only 2. epsilon false, it there an official answer/doc with updated information that ensure that is this the right procedure to avoid also NAS protocols interruption?

Thank you very much,


 

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Re: No Oncammand System Manager after upgrade 9.3

March 12, 2018, 11:20 am
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I am also having the same issue but it appears to be new requirements on the Netapp side that IE must match because it works from some Windows 2012 R2 servers' IE but not from others. Also if I try to access the logs area through the SPI URL (i.e. https://<clusterIP>/spi/) IE just hangs and never completes but I can get to teh SPI logs area though https for each node, just not the if using the cluster ip. I have a ticket open and a session scheduled with tech support tomorrow, but any other insights before could be helpful.

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Re: No Oncammand System Manager after upgrade 9.3

March 12, 2018, 11:23 am
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one thing i did notice is that third-party extensions allowed is enabled on the server that works but not the server that doesnt work; got a question out to tech support to see if that is now required in IE when 9.3 is installed.

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Re: No Oncammand System Manager after upgrade 9.3

March 12, 2018, 1:13 pm
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We had the issue when updating to 9.3 on a test array.  I didn't actually perform the upgrade, but my partner who did, said he saw an error as ONTAP was upgrading.  Of course, he didn't write it down.

 

OnCommand System Manager allowed the sign-on screen, and then failed.  We recovered by force re-installing ONTAP.  (Call Support first)

 

As to the browsers, I've found that Firefox 48 64-bit is the best to use on the newere versions of NetApp software.  DO NOT GO later than 48 at this time.

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