Posts Tagged ‘ SAS 9.1 I/O Errors ’

SAS 9.1, Windows 2003, I/O and 32 bit limitations

Sep
29

Over the lastest year or two we have had ongoing issues running SAS 9.1 on 32 bit windows.

Main two issues that constantly arise are:

  • Metadata server exceeding addressable memory in 32 bit windows and crashing
  • I/O errors intermittently reading/writing SAS datasets

We have tried all the SAS “support” tools to reduce the size of our metadata server.  The final answer seems to be we will have to create a new one from scratch and export/import the object we need to retain.

We have also “tweaked” the windows file cache to reduce the I/O errors due to the windows file buffers being written faster than they can be cleared.  On that note I found this tech support note the other day:

Problem Note 36664: Potential issues with heavy SAS® I/O workloads on Windows 2003, 32- or 64-bit operating systems

Which I paraphrase as saying dont use Windows 2003 if you want to actually process any reasonable amount of data.

Of course the real answer it seems is to move to SAS 9.2 and 64 bit Windows 2008, but it does make me wonder how long it would take before you blew the limits of that operating system?

And shouldn’t the SAS environment at least tell you when it was experiencing these issues, rather than just abending so rudely?

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SAS 9.1.3 I/O Errors on a Windows 2003 server

Oct
19

A while ago we had a major problem as a result of upgrading our Windows servers and operating system, where we started to get a large number of I/O errors when running our batch schedule.

In the end we fixed it by changing the Paged Pool Usage Maximum set from 80% to 40% on the servers as our Windows guru’s worked out that SAS was filling the Windows cache faster than Windows could clear it, causing the I/O errors.

SAS support also suggested we follow this instrauctions in this tech support note:

http://support.sas.com/resources/papers/IOthruSGIO.pdf

If you have struck another fix then let me know.

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