Pythian Blog: Technical Track

How To Resize Oracle ACFS Volume

by Michael Dinh on Jul 31, 2019 12:00:00 AM

There may be many reasons as to why Oracle ACFS volume would need to be resized. Current Filesystem for ACFS is 299G. [code] Filesystem Size Used Avail Use% Mounted on /dev/asm/acfs_vol-177 299G 2.6G 248G 2% /ggdata02 [/code] Free_MB is 872 which causes paging due to insufficient FREE space from ASM Disk Group ACFS_DATA. [code] $ 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/ [/code] 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: [code] $ 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 [/code] Resize /ggdata02 to 250G: [code] $ acfsutil size 250G /ggdata02 acfsutil size: new file system size: 268435456000 (256000MB) [/code] Review results: [code] $ 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 [/code] In conclusion, acfsutil can be used to resize ACFS volume either by increasing or decreasing size.

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