Two issues on Exadata

Question1.

In our 3-2 quarter X Rack ASM, I noticed that all of the ASM disks belong to such or such starts. That is to say. There is no spare parts I can use ASM disks

to create a new ASM diskgroup, and add an existing diskgroup.

In standard CARS (non-Exadata), I use the following query to find the ASM disks that are not part of any starts. Here at exadata when I run the same query, it does not return all records that

means there is no available spare disks ASM part

SQL > select name, path of v$ asm_disk where group_number = 0;

no selected line

-Example of output v$ asm_disk

SQL > select group_number, name, path of the order of v$ asm_disk group_number in CSA;

PATH NAME GROUP_NUMBER

------------ ------------------------------ -------------------------------------------------------

1 DATA_DM01_CD_01_DM01CELADM01 o/192.168.10.13/DATA_DM01_CD_01_dm01celadm01

1 DATA_DM01_CD_05_DM01CELADM02 o/192.168.10.14/DATA_DM01_CD_05_dm01celadm02

1 DATA_DM01_CD_02_DM01CELADM02 o/192.168.10.14/DATA_DM01_CD_02_dm01celadm02

1 DATA_DM01_CD_00_DM01CELADM02 o/192.168.10.14/DATA_DM01_CD_00_dm01celadm02

1 DATA_DM01_CD_00_DM01CELADM01 o/192.168.10.13/DATA_DM01_CD_00_dm01celadm01

.

.

< snipped >

When the Oracle ACS team built an Exadata machine based on the excel workbook that provides to the customer, they don't let not the spare ASM disks to use for the future ?

Question2.

In a configuration of Exadata X 3 - 2 (full, half-board or 1/4), how can I determine the raw storage from the command line?

For example: for a half rack X 3-2, there are 7 storage servers. Each with 12 disks each a 3 to in size. That is to say 12 x 3 = 36 TB per server. But I know only from reading the specification. How can I determine this command line?

Hi J.Kiechle,

(1) the 12 drives in each cell are divided into 3 sections.

On the first two discs of that internal 30 GB is used for the operating system. the rest is used for the RECO (20%) and groups of disks of DATA (80%) (DATA is on the outer part of the disk).

On the other ten drives the internal 30 GB is used to DBFS and the rest is used for the RECO (20%) and groups of disks of DATA (80%). (If you opt for local backups RECO and the DATA will be distributed at 40%, 60%)

So in all the cells of the disks in the Group of DATA disks will be an equal size and location on all disks by avoiding an imbalance of IO. That there is no hot spare, you wouldn't be able to thus generate an imbalance of IO.

(2) raw disk capacity is can be found in the total_mb column in v$ asm_diskgroup, but as part of it is used to reflect the ASM data I think more useful to ask for net capacity.

Please log in to your preferred as a DBA Exadata database and run the SQL next and after the release.

Guest "details of volume of the DSO."

Select the name,

Round (TOTAL_MB/decode(type,'NORMAL',2,'HIGH',3,1)/1024) total_GB,.

Round(usable_FILE_mb/1024) usable_free_GB.

Round ((HOT_USED_MB+COLD_USED_MB) /decode(type,'NORMAL',2,'HIGH',3,1)/1024) data_use_GB,.

Round (REQUIRED_MIRROR_FREE_MB, decode(type,'NORMAL',2,'HIGH',3,1), 1024) Req_free_redun_GB,

type

v $ asm_diskgroup

where total_mb! = 0

/

HTH,

Tycho

Tags: Database

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