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OpenVMS Hobbyist Program | Alpha Systems Forums | Emulated Alpha Forum
Author Where are my free blocks ???

Posts: 28
Joined: 01.04.12
Posted on February 25 2015 01:47

I'm running freeaxp with two disk images mounted:
on disk0.0 I have an image of 3,99 Go containing openvms 7.1 system
on disk0.1 I have an image of 3,99 Go containing applications

I just face a problem of "disk full" on my application disk but I do not understand why
If i do a show device I got:
$>show device

Device Device Error Volume Free Trans Mnt
Name Status Count Label Blocks Count Cnt
DSA0: Mounted 0 AXPVMSSYS 6243948 361 1
DSA1: Mounted 0 DISKAPPLI 0 182 1
$1$DKA0: (ALPHA1) ShadowSetMember 0 (member of DSA0smiley
$1$DKA100: (ALPHA1) ShadowSetMember 0 (member of DSA1smiley
so that tell me that the application disk is full, but doing on one side
$> dir dsa1:[...]/size/grand_total

Grand total of 454 directories, 24791 files, 8239810 blocks.
and on the other side
$> show device dsa1/full

Disk DSA1:, device type RZ29B, is online, mounted, file-oriented device,
shareable, available to cluster, error logging is enabled.

Error count 0 Operations completed 6270010
Owner process "" Owner UIC [SYSTEM]
Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W
Reference count 315 Default buffer size 512
Total blocks 8380080 Sectors per track 206
Total cylinders 180 Tracks per cylinder 226

Volume label "DISKAPPLI" Relative volume number 0
Cluster size 9 Transaction count 178
Free blocks 0 Maximum files allowed 419004
Extend quantity 5 Mount count 1
Mount status System Cache name "_DSA0:XQPCACHE"
Extent cache size 64 Maximum blocks in extent cache 0
File ID cache size 64 Blocks currently in extent cache 0
Quota cache size 0 Maximum buffers in FCP cache 450

Volume Status: subject to mount verification, file high-water marking, write-
back caching enabled.

Disk $1$DKA100:, device type RZ29B, is online, member of shadow set DSA1:, error
logging is enabled.

Error count 0 Shadow member operation count 6269544
Allocation class 1

So I got 8380080 total blocks - 8239810 used blocks = 0 blocks left

Could some one explain where are gone the 8380080- 8239810=140270 blocks i.e more than 70Mb that disapear!!

Thanks for your help.

Author RE: Where are my free blocks ???
Bruce Claremont

Posts: 506
Joined: 07.01.10
Posted on February 25 2015 02:20
Try a DIR/SIZE=ALL on each volume. The "missing" blocks are probably allocated to various files, but not yet used.
Author RE: Where are my free blocks ???

Posts: 28
Joined: 01.04.12
Posted on February 25 2015 03:13
thanks for the reply.

doing this I got the difference, now I have to understand why so much space is allocated for nothing.
Author RE: Where are my free blocks ???
Bruce Claremont

Posts: 506
Joined: 07.01.10
Posted on February 26 2015 06:42
Take a look at the file FDL's. Allocation and extent sizes are stored there. They can be modified using EDIT/FDL and the CONVERT utility.

In addition to general clean-up to recover space, you could also do an image backup to a new disk. This will make the files contiguous and recover some space, particularly if you have lots of large, fragmented files. However, if your disks are nearly full, then this is just a stop gap, Time for some more disks and/or larger disks.

Since you are running FreeAXP, you could also compress the disk file from the Windows side to create space for a larger virtual volume. As with any software, there is a very small I/O penalty when accessing compressed volumes with FreeAXP. I use this technique often on archive volumes that see little activity.
Author RE: Where are my free blocks ???

Posts: 28
Joined: 01.04.12
Posted on March 16 2015 22:34
THanks for all the help, I've a clear view now.

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