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Exadata Database Compute Node Volume Is Smaller Than Expected (Doc ID 1525286.1)

Last updated on JANUARY 31, 2020

Applies to:

Exadata X3-2 Half Rack - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.


The standard size of VGExaDb volume group is much smaller and has less free space then same standard VDG group:


root@####db01 ~]# vgdisplay
 --- Volume group ---
 VG Name               VGExaDb
 System ID
 Format                lvm2
 Metadata Areas        1
 Metadata Sequence No  5
 VG Access             read/write
 VG Status             resizable
 MAX LV                0
 Cur LV                4
 Open LV               3
 Max PV                0
 Cur PV                1
 Act PV                1
 VG Size               277.96 GB
 PE Size               4.00 MB
 Total PE              71158
 Alloc PE / Size       47104 / 184.00 GB
 Free  PE / Size       24054 / 93.96 GB  ->>> This free space seems small

[root@####db04 ~]# /opt/oracle.SupportTools/ -check
[INFO] This is SUN FIRE X4170 M3 machine
[INFO] Number of LSI controllers: 1
[INFO] Physical disks found: 4 (252:0 252:1 252:2 252:3)
[INFO] Logical drives found: 1
[INFO] Dual boot installation: no
[INFO] Linux logical drive: 0
[INFO] RAID Level for the Linux logical drive: 5
[INFO] Physical disks in the Linux logical drive: 4 (252:0 252:1 252:2 252:3)
[INFO] Dedicated Hot Spares for the Linux logical drive: 0
[INFO] Global Hot Spares: 0
[INFO] Valid single boot configuration found for Linux: RAID5 from 4 disks with no global and dedicated hot spare disks

[root@####db04 ~]# /opt/MegaRAID/MegaCli/MegaCli64 -LDInfo -Lall -Aall

Adapter 0 -- Virtual Drive Information:
Virtual Drive: 0 (Target Id: 0)
Name                :DBSYS
RAID Level          : Primary-5, Secondary-0, RAID Level Qualifier-3
Size                : 835.394 GB
Parity Size         : 278.464 GB
State               : Optimal
Strip Size          : 1.0 MB
Number Of Drives    : 4
Span Depth          : 1
Default Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU
Default Access Policy: Read/Write
Current Access Policy: Read/Write
Disk Cache Policy   : Disabled
Encryption Type     : None

Is VD Cached: No 



 We can see the reclaimed space reflected in the total space available, but the extra free space is not visible in vgdisplay.


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