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philbishop
Contributor

QlikView Cluster Requirements/Experience of NAS/SAN storage configurations

I have a customer moving to a Qluster solution. I am getting mixed signals from QlikTech about if the shared storage should be NAS or just SAN directly attached to the primary server box. According to the V10 reference manual, a NAS is preferred, but it does not say required. According to the release notes, a non-Windows NAS is not supported, but nothing about a Windows based SAN connected to the one of the servers.

Can anyone comment on experiences with either of these configurations?

Thanks.

5 Replies
Not applicable

QlikView Cluster Requirements/Experience of NAS/SAN storage configurations

We have spent over two weeks trying to configure a cluster using QV10 SR2 (yes I know SR3 is now available).  We have two cluster nodes, with the shared root node located on a Windows network share.  This Windows server uses a replicated SAN for backing store.  The cluster nodes are geographically distributed (for disaster recovery purposes).

This configuration has been very unstable, with the QVS services restarting randomly and QDS (publisher) failing to reload.

The most prominent QVS errors have been "PGO: Failed to open" errors and "Warning    File: Shared File Disappeared: \\<some_server>\<some_file>.qvw.Meta.".  The latter error is most disruptive, as it is always followed by a server restart with this error:  "Error    Restart: Server aborted trying to recover by restart. Reason for restart: Internal inconsistency, general exception detected."

Recently, QV support has suggested that the problem might be related to the geographically distributed QVS servers.  They suggested that we relocate the root folder to a drive local to one of the two cluster nodes.  We did this, and it reduced the number of errors, but did not eliminate them entirely.

Note that our actual QVWs are also located on the aforementioned Windows share, albeit in different directories.  These folders were not moved to the local drive.

All errors also cease when we disable the QVS on one of the cluster nodes, and the errors return when the second QVS service is re-enabled.

Not applicable

QlikView Cluster Requirements/Experience of NAS/SAN storage configurations

Where is your physical SAN LUN? I suspect the you're trying to use this server is neither hosted on windows clustered OS nor veritas clusterd SAN. Even I came across the same challenge. I am trying to implement the deployment and see.

Not applicable

Re: QlikView Cluster Requirements/Experience of NAS/SAN storage configurations

We are using IPStor, not Veritas, and the LUNs are actually served through a Windows 2003 server, so they are presented as actual windows shares; i.e. no clients access the SAN directly, they all go through the Windows 2003 server.

I'm not sure what you mean by hosted on the windows clustered OS.  The official response from QV is that clustered QVS servers cannot be geographically dispersed, and there is no plan to support this in the foreseeable future.

It is not clear how this topological distance is measured (our SAN storage is fairly low latency, on the order of <50ms on average, regardless of client location on the network), nor is it clear whether the problem-causing distance is the distance between QVS servers, or the distance between the QVS server(s) and the Windows server sharing the common root folder.

It is the shared root folder that is causing the problem, according to QV.  We have even tried putting the shared root folder on the local C: drive of one of the geographically-dispersed QVS servers, but this does not resolve the problem.

Not applicable

Re: QlikView Cluster Requirements/Experience of NAS/SAN storage configurations

Hello neoteric,

Do you have found a sollution to the issue about pgo file errors and shared file desappearing ? I have a simularly issue in my plaform built as cluster composed of 2 qvs nodes.

if you have find recomandations about shared storage configuration for qv cluster, please share it.

thank you a lot,

Employee
Employee

Re: QlikView Cluster Requirements/Experience of NAS/SAN storage configurations

QlikTech only support one thing, a true Windows share.  Behind the Windows share could be a SAN or whatever but it needs to be presented via a real Windows box.