How To Resize Oracle ACFS Volume

There may be many reasons as to why Oracle ACFS volume would need to be resized. Current Filesystem for ACFS is 299G.

Filesystem Size Used Avail Use% Mounted on 
/dev/asm/acfs_vol-177 299G 2.6G 248G 2% /ggdata02

Free_MB is 872 which causes paging due to insufficient FREE space from ASM Disk Group ACFS_DATA.

$ asmcmd lsdg -g ACFS_DATA 
Inst_ID State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name 
1 MOUNTED EXTERN N 512 4096 4194304 307184 872 0 872 0 N ACFS_DATA/ 
2 MOUNTED EXTERN N 512 4096 4194304 307184 874 0 872 0 N ACFS_DATA/

Evaluating resizing options

Option 1 is to exclude monitoring for ASM Disk Group ACFS_DATA to fully utilize allocated storage. Option 2 is to resize ACFS to have sufficient free space for ASM Disk Group ACFS_DATA to prevent paging. In this case, it was decided to resize ACFS volume to a smaller size to prevent paging for free space alert for ASM Disk Group.

Review attributes for ASM Disk Group ACFS_DATA:

$ asmcmd lsattr -l -G ACFS_DATA 
Name Value 
access_control.enabled FALSE 
access_control.umask 066 
au_size 4194304 
cell.smart_scan_capable FALSE 
compatible.advm 12.1.0.0.0 
compatible.asm 12.1.0.0.0 
compatible.rdbms 12.1.0.0.0 
content.check FALSE 
content.type data 
disk_repair_time 3.6h 
failgroup_repair_time 24.0h 
idp.boundary auto 
idp.type dynamic 
phys_meta_replicated true 
sector_size 512 
thin_provisioned FALSE

Executing the acfs resize

Resize /ggdata02 to 250G:

$ acfsutil size 250G /ggdata02 
acfsutil size: new file system size: 268435456000 (256000MB)

Verifying the resized volume

Review results:

$ asmcmd lsdg -g ACFS_DATA 
Inst_ID State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name 
1 MOUNTED EXTERN N 512 4096 4194304 307184 51044 0 51044 0 N ACFS_DATA/ 
2 MOUNTED EXTERN N 512 4096 4194304 307184 51044 0 51044 0 N ACFS_DATA/ 

$ df -h /ggdata02 
Filesystem Size Used Avail Use% Mounted on 
/dev/asm/acfs_vol-177 250G 2.6G 248G 2% /ggdata02 

$ asmcmd volinfo --all 
Diskgroup Name: ACFS_DATA 
Volume Name: ACFS_VOL 
Volume Device: /dev/asm/acfs_vol-177 
State: ENABLED 
Size (MB): 256000 
Resize Unit (MB): 512 
Redundancy: UNPROT 
Stripe Columns: 8 
Stripe Width (K): 1024 
Usage: ACFS 
Mountpath: /ggdata02

Conclusion

In conclusion, acfsutil can be used to resize ACFS volume either by increasing or decreasing size.

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