How do I turn on XFC caching?

How do I turn on XFC caching?

Post by Alfred Fal » Sun, 29 Jun 2003 01:31:01



The VMS 7.3 System Manager's Manual says about Extended File Cache
(XFC):
  This data cache is available on OpenVMS Alpha Version 7.3 and later,
  and is available only on OpenVMS Alpha. It provides better performance
  and more capability than VIOC. XFC is the default cache on OpenVMS
  Alpha Version 7.3 and later.  

However SHOW MEMORY/CACHE shows the following:
  Vols in Full XFC mode     0    Vols in VIOC Compatible mode      13
  Vols in No Caching mode   0    Vols in Perm. No Caching mode      0

Until a few months ago, the cluster included a VAX at 7.2, so this was
expected.  Now the VAX is gone, but the caching mode is still VIOC.  
Anybody got any idea why?  Or should I even care?

The cluster is
   AS DS20 6/500 running OVMS 7.3
      (with SCSI controllers and disks)
   AS 800 5/500 running OVMS 7.3
      (with SCSI controllers and disks)
   DSSI bus with two HSD05's.

   Sysgen parameter VCC_FLAGS is 2 (default, select XFC) on both
systems.

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How do I turn on XFC caching?

Post by Craig A. Berr » Sun, 29 Jun 2003 02:21:28




Quote:> The VMS 7.3 System Manager's Manual says about Extended File Cache
> (XFC):

> However SHOW MEMORY/CACHE shows the following:
>   Vols in Full XFC mode     0    Vols in VIOC Compatible mode      13
>   Vols in No Caching mode   0    Vols in Perm. No Caching mode      0

> Until a few months ago, the cluster included a VAX at 7.2, so this was
> expected.  Now the VAX is gone, but the caching mode is still VIOC.  

No it's not.  It's VIOC "compatible" mode, which I'm pretty sure is the
only XFC mode available at present.  There will probably be a "full XFC
mode" sometime in the future.  Be sure to be up-to-date on ECOs; the
initial XFC in v7.3 had some serious problems, as did the first ECO for
it.

 
 
 

How do I turn on XFC caching?

Post by Beach Run.. » Sun, 29 Jun 2003 04:26:09


Make sure you have the latest XFC ECO and set vcc_flag 2

That turns it on.

Beach Runner....




> > The VMS 7.3 System Manager's Manual says about Extended File Cache
> > (XFC):

> > However SHOW MEMORY/CACHE shows the following:
> >   Vols in Full XFC mode     0    Vols in VIOC Compatible mode      13
> >   Vols in No Caching mode   0    Vols in Perm. No Caching mode      0

> > Until a few months ago, the cluster included a VAX at 7.2, so this was
> > expected.  Now the VAX is gone, but the caching mode is still VIOC.

> No it's not.  It's VIOC "compatible" mode, which I'm pretty sure is the
> only XFC mode available at present.  There will probably be a "full XFC
> mode" sometime in the future.  Be sure to be up-to-date on ECOs; the
> initial XFC in v7.3 had some serious problems, as did the first ECO for
> it.

 
 
 

1. How do I turn on XFC caching?

Folks:

I can't get XFC to work either.  Is there a 7.3 patch?  I haven't been able
to locate it online.

dave.

$ write sys$output f$getsyi("arch_name")
VAX

$ write sys$output f$getsyi("version")
V7.3

$ mc sysgen sho vcc_flag
Parameter
Name            Current    Default     Min.     Max.     Unit  Dynamic
--------------  -------    -------    -------  -------   ---- -------
VCC_FLAGS_D        2          0         0       255 Bitmask    D

$ sho mem/cache/full
               System Memory Resources on 28-JUN-2003 15:04:29.76

Virtual I/O Cache
     Total Size (pages)               0    Read IO Count
3949
     Free Pages                       0    Read Hit Count
0
     Pages in Use                     0    Read Hit Rate
0%
     Maximum Size (SPTEs)             0    Write IO Count
34
     Files Retained                   0    IO Bypassing the Cache
318

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