How to validate the performance of I/o using calibrate_io

Dear Experts,

I ran the calibrate_io as recommended by the expert, but now, I am not able it analysed.

01:38:29 SQL> declare
01:38:55 2 l_latency integer;
01:38:55 3 l_iops integer;
01:38:55 4 l_mbps integer;
01:38:55 5 begin
01:38:55 6 dbms_resource_manager.calibrate_io (
01:38:55 7 4,
01:38:55 8 10,
01:38:55 9 l_iops,
01:38:55 10 l_mbps,
01:38:55 11 l_latency
01:38:55 12 );
01:38:55 13 dbms_output.put_line ( l_iops);
01:38:55 14 dbms_output.put_line (l_latency);
01:38:55 15 dbms_output.put_line( l_mbps);
01:38:55 16 end;
01:38:55 17 /

.START_TIME : 09-MAR-14 01.38.58.619000 AM
.END_TIME : 09-MAR-14 01.43.35.354000 AM
.MAX_IOPS : 87
.MAX_MBPS : 54
.MAX_PMBPS : 9
.LATENCY : 10

.NUM_PHYSICAL_DISKS : 4

select * from v$io_calibration_status

.FILE_NO : 139 
.FILETYPE_ID : 2 
.FILETYPE_NAME : Data File 
.SMALL_READ_MEGABYTES : 2119 
.SMALL_WRITE_MEGABYTES : 5559 
.LARGE_READ_MEGABYTES : 293883 
.LARGE_WRITE_MEGABYTES : 20828 
.SMALL_READ_REQS : 66028 
.SMALL_WRITE_REQS : 390746 
.SMALL_SYNC_READ_REQS : 35648 
.LARGE_READ_REQS : 295787 
.LARGE_WRITE_REQS : 84528 
.SMALL_READ_SERVICETIME : 13955851631 
.SMALL_WRITE_SERVICETIME : 413902932 

.SMALL_SYNC_READ_LATENCY : 7610803738 

.LARGE_READ_SERVICETIME : 1385363733 
.LARGE_WRITE_SERVICETIME : 7769742 
.ASYNCH_IO : ASYNC_ON 
.ACCESS_METHOD : OS_LIB 
.RETRIES_ON_ERROR : 0 
----------------- 

I have 40G RAM wndows 2012 os 11 GR 2 database

I have 4 2 TB drives, but I think that my IO is slow.

I have table of 500G and I need to create 20 indexes (each 10 GB) on it, and it's very slow.

Each index is 2.5 hours and running more to create indexes in parallel session is not to reduce the time spent together.

Question : Is my disk IO slow?

Ok

For now, I'm going to assume there is a paging file (pagefile.sys) and it's on C:

I will assume you also do not have RAID, or you have RAID-5.

Your data, it is clear that you have a bottleneck of e/s on the D drive.

More than 40 applications for e/s in the queue is considered to be the IO bottleneck.

Refer to

Disk Avg. QUEUE length 51,000 51,000 0

Disk AVG READ TAIL length 51,000 51,000 0

The i/o bottleneck is caused by having everything on one disc.

This also translates single Point of failure.

(If this breaks your database is ready for the funeral, if you do not have a backup).

Oracle recommends to use RAID 1 + 0 (= SAME band and the mirror). To aid that it would be no more important where the files are.

A SAN or a NAS would be a good RAID 1 + 0 configuration.

You might want to consider also buying conventional additional disks and separate data and indices.

However using RAID technology good should not be necessary.

-----------

Sybrand Bakker

Senior Oracle DBA

Tags: Database

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