Re: What is DKA100:XQPCACHE, Extent cache, etc., from SH DEV D/FU?
From: AEF (spamsink2001_at_yahoo.com)
Date: 07/29/05
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Date: 29 Jul 2005 09:09:08 -0700
AEF wrote:
> Hello cov readers!
>
> There is something below with cache name _xxxxx$DKA100:XQPCACHE. Why is
> the system disk name there? All disks on a given system are named this
> way. I guess there is only one "XQP cache" for each system. (What
> happens to this with disks shared in VMSclusters?)
>
> What is this cache? Where is it? Why is it so large? (There appears to
> be no room at all for this in memory.) Why is the "maximum number of
> blocks in cache (96734) larger than its own size (64)? Where is it in
> the docs (I did look and I could not find it).
>
> And any other words that would clear up what all these caches are.
>
> Note: I'm not trying to address any problem. I just want to know what
> this is.
>
> Hardware: MicroVAX 3100
> Software: VMS v6.1 VAX (I see the same on my v6.2 systems)
>
> Thanks!
>
[...]
Better version of SH DEV/FU
Disk xxxxx$DKA200:, device type RZ28, is online, mounted, file-oriented
device,
shareable, error logging is enabled.
Error count 0 Operations completed 5206866
Owner process "" Owner UIC [SYSTEM]
Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W
Reference count 2 Default buffer size 512
Total blocks 4110480 Sectors per track 86
Total cylinders 2988 Tracks per cylinder 16
Volume label "DATA1" Relative volume number 0
Cluster size 4 Transaction count 2
Free blocks 966088 Maximum files allowed 411048
Extend quantity 5 Mount count 1
Mount status System Cache name "_xxxxx$DKA100:XQPCACHE"
Extent cache size 64 Maximum blocks in extent cache 96608
File ID cache size 64 Blocks currently in extent cache 51772
Quota cache size 0 Maximum buffers in FCP cache 980
Volume owner UIC [SYSTEM] Vol Prot S:RWCD,O:RWCD,G:RWCD,W:RWCD
Volume status: subject to mount verification, write-back caching
enabled.
Sorry to respond to my own post in this manner, but I just discovered
that this has to do with the ACP system params. Apparently, extents
refer here to free space.
Anyway, I still have a question (saving grace!):
If ACP_DIRCACHE caches directory blocks, does it not then contain
mappings of filenames to FID's? In which case, what is ACP_FIDCACHE
for?
Again, my apologies for jumping the gun in posting to soon.
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