Half Rack exadata with DBFS_DG having normal redundancy ?
My understanding was that the one command installation scripts automatically set the redundancy level for the DBFS_DG diskgroup.I believe I had actually foud this in the onecommand code in gridsteps.pm function CreateASMDiskgroups() . For eighth and quarter racks it is Normal and for half and full it is high. This is to ensure that the critical OCR and vote files are safeguarded to the maximum extent possible. However recently I came across several half rack installations with the DBFS_DG redundancy as normal. Is there any way to override this or does this mean that the grid software was manually reinstalled at some point ?
This is on x2-2 half racks. Appreciate it if anyone know whether there is any way this might have happened through a standard onecommand implementation.
onecommand will create DBFS_DG in normal redundancy every time. If you're on a half or full rack with a high redundancy diskgroup, it will relocate the OCR and voting files to that diskgroup. This happens in the CreateASMDiskgroups step of onecommand.
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What is the usable space of normal redundancy disk group with two uneven capacity fail groups
Hi,
I have a normal redundancy disk group (DATA) with two uneven capacity fail groups (FG1 and FG2). FG1 size is 10GB and FG2 size is 100GB.
In this case what will be the usable space of the disk group (DATA)? is it 10G or 55G?
Thanks,
MahiPlease, don't duplicate post with same matter.
This question was answered in your previous thread.
Re: ASM normal redundancy disk group -
Is this normal in 'Normal Redundancy' ?
GI version: 11.2.0.4 (3-Node RAC)
OS : Oracle Linux 6.4
Storage from EMC Symmetrix VMAX
I created a diskgroup with normal redundancy as shown below.
10 LUNs of 500GB each = 5000GB
CREATE DISKGROUP DATA_DG1
NORMAL REDUNDANCY
DISK
'ORCL:DATA_D1',
'ORCL:DATA_D2',
'ORCL:DATA_D3',
'ORCL:DATA_D4',
'ORCL:DATA_D5',
'ORCL:DATA_D6',
'ORCL:DATA_D7',
'ORCL:DATA_D8',
'ORCL:DATA_D9',
'ORCL:DATA_D10'
ATTRIBUTE 'au_size' = '4M';
Diskgroup created.
Since it was normal I was expecting half of the Raw space 5000GB = 2.5 Terabyte of usable space. But, the below query output shows I got only 2.19 TeraBytes of Usable space (2249.86 GB). Around 250GB short of what I was expecting.So, where is my 250GB gone ?
SQL> select name, TYPE, TOTAL_MB/1024/1024, FREE_MB/1024/1024, USABLE_FILE_MB/1024/1024 from v$asm_diskgroup where name = 'DATA_DG1';
NAME TYPE TOTAL_MB/1024/1024 FREE_MB/1024/1024 USABLE_FILE_MB/1024/1024
DATA_DG1 NORMAL 4.8828125 4.8825531 2.19713593The amount of usable file space is equal to the amount of free disk space subtracted by the amount of disk space that is required to restore redundancy after a failure divided by the redundancy level of the disk group which is two in your case.
Run:
select trunc((free_mb - required_mirror_free_mb) / 2) as useable from v$asm_diskgroup where name='DATA_DG1';
Source: http://prutser.wordpress.com/2013/01/03/demystifying-asm-required_mirror_free_mb-and-usable_file_mb/ -
ASM normal redundancy disk group
Hi,
One of my collegues created an ASM disk group with normal redundancy using 2 disks. But the disks are not of same size, one disk is 100GB and another one is 10GB.
Now the usable space out of diskgroup is showing 55GB. When I checked the diskgroup properties it is showing 2 fail groups one is DATA1_0000 with 10GB and other is DATA_0001 with 100GB.
My question is why it is showing 55GB as usable space?
My assumption is as it is having 2 fail groups with different disks of different sizes. For the failgroup 2 even it is of 100GB size, in order to maintain the redundancy with other small FG(10G) it will consider only 10GB out of 100GB.
So, the 2nd FG size also should be 10GB. So that the usable space should show as 10GB as opposed to 55GB (not (100+10)/2).
Please clarify me.
Thanks,
MahiHi,
Please see the below output, I am talking about DATA1 disk group with number 2.
SQL> select group_number,name, type,total_mb, free_mb, required_mirror_free_mb, usable_file_mb from v$asm_diskgroup;
GROUP_NUMBER NAME TYPE TOTAL_MB FREE_MB
REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB
1 DATA NORMAL 6144 5344
2048 1648
2 DATA1 NORMAL 112640 108604
SQL> select group_number, name, mount_status, state, redundancy, failgroup, failgroup_type, os_mb, total_mb, free_mb from v$asm_disk;
GROUP_NUMBER NAME MOUNT_S STATE REDUNDA
FAILGROUP FAILGRO OS_MB TOTAL_MB FREE_MB
1 DATA_0000 CACHED NORMAL UNKNOWN
DATA_0000 REGULAR 2048 2048 1781
1 DATA_0001 CACHED NORMAL UNKNOWN
DATA_0001 REGULAR 2048 2048 1782
1 DATA_0002 CACHED NORMAL UNKNOWN
DATA_0002 REGULAR 2048 2048 1781
GROUP_NUMBER NAME MOUNT_S STATE REDUNDA
FAILGROUP FAILGRO OS_MB TOTAL_MB FREE_MB
2 DATA1_0000 CACHED NORMAL UNKNOWN
DATA1_0000 REGULAR 10240 10240 8222
2 DATA1_0001 CACHED NORMAL UNKNOWN
DATA1_0001 REGULAR 102400 102400 100382
Thanks,
Mahipal -
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OCR Disk - change from external to normal redundancy
Hey, I am using grid 11.2.0.3
I have one +OCR Disk in ASM configured. unfortunately with external redundancy.
I have two storages - each storage is representing 2 disks á 500 MB
But I think that my cluster will break down, in a case of a storage failure. Is that right ?
Can I switch to normal redundancy ? If not, how to modify the configuration.
I could create two new disks, and could create a new diskgroup for OCR. But how to switch ?
Is it the ocrconfig replace command ? Or with a backup ?
ocrcheck
Status of Oracle Cluster Registry is as follows :
Version : 3
Total space (kbytes) : 262120
Used space (kbytes) : 3032
Available space (kbytes) : 259088
ID : 419542868
Device/File Name : +OCR
Device/File integrity check succeeded
Device/File not configured
Device/File not configured
Device/File not configured
Device/File not configured
Cluster registry integrity check succeeded
Logical corruption check succeeded
ocrconfig -showbackup
2011/11/04 05:48:57 /crs/cdata/bfkoe/backup00.ocr
2011/11/04 01:48:57 /crs/cdata/bfkoe/backup01.ocr
2011/11/03 21:48:57 /crs/cdata/bfkoe/backup02.ocr
2011/11/03 17:48:56 /crs/cdata/bfkoe/day.ocr
2011/11/03 17:48:56 /crs/cdata/bfkoe/week.ocr
PROT-25: Manual backups for the Oracle Cluster Registry are not availableChristian wrote:
Hi, would this the way to replace my diskgroup
srvctl stop database -d <database>
ocrconfig -manualbackup
ocrconfig -showbackup manual
crsctl stop crs [-f] on all nodes
ocrconfig -delete +OCR
#Remove ASM Diskgroup
oracleasm deletedisk OCR1
oracleasm deletedisk OCR2
oracleasm deletedisk OCR3
oracleasm deletedisk OCR4
#Remove ASM Header
dd if=/dev/zero of=/dev/mapper/vot1_agg01_part1 bs=1024k count=200
dd if=/dev/zero of=/dev/mapper/vot3_agg01_part1 bs=1024k count=200
dd if=/dev/zero of=/dev/mapper/vot2_agg02_part1 bs=1024k count=200
dd if=/dev/zero of=/dev/mapper/vot4_agg02_part1 bs=1024k count=200
#Re-Create ASM Diskgroup
oracleasm createdisk OCR1 /dev/mapper/vot1_agg01_part1
oracleasm createdisk OCR2 /dev/mapper/vot3_agg01_part1
oracleasm createdisk OCR3 /dev/mapper/vot2_agg02_part1
oracleasm createdisk OCR4 /dev/mapper/vot4_agg02_part1
Recreate +OCR Diskgroup via asmca with normal redundancy and mount diskgroup on all nodes
ON node 1:
crsctl start crs -excl -nocrs
ocrconfig -add +OCR
ocrconfig -restore <file_name>
ocrcheck
On node1:
crsctl stop crs -f
On node2:
ocrconfig -repair -replace
On node1+node2
crsctl start crs
cluvfy comp ocr -n all -verbose
Does this look right ?
Christian
Looks complicated, I would suggest have a read http://download.oracle.com/docs/cd/E11882_01/rac.112/e16794/votocr.htm#CWADD91099
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