Gather Disk I/O statistics on Read and Write I/O

[comtec17]

Looking for some guidance on gathering performance stats on an RH server.

I have ran SAR but the output comes back as follows:

Linux 2.4.21-20.ELsmp



12:00:00 AM tps rtps wtps bread/s bwrtn/s

12:10:00 AM 2097.94 2038.20 59.74 35285.37 1003.61

12:20:00 AM 834.05 799.81 34.24 13481.50 555.33

12:30:00 AM 10.02 5.06 4.96 68.59 112.58

12:40:00 AM 2066.14 178.15 1887.99 2187.76 26870.98

12:50:00 AM 6511.72 1154.84 5356.89 16460.21 77194.94

01:00:00 AM 8236.61 2772.76 5463.85 40216.03 76536.61

01:10:00 AM 5338.67 4011.53 1327.14 57645.04 18752.32

01:20:01 AM 3950.33 1909.42 2040.91 26375.26 27123.16

01:30:00 AM 10245.00 4480.67 5764.33 57791.83 73917.12

01:40:00 AM 12004.93 5148.45 6856.49 66150.53 87776.81

01:50:00 AM 11784.39 6096.82 5687.56 78923.12 71582.84

02:00:01 AM 13944.95 8896.60 5048.35 113853.21 62605.53

02:10:01 AM 10257.70 5326.42 4931.28 66706.89 60245.89

02:20:01 AM 14687.58 8487.15 6200.44 107899.29 75586.26

Now I want to determine how many read I/O's and Write I/O's are being done but the above stats are in blocks. How can I determine what the actual numbers are.

100000 IOPS is crazy...

I am interested in converting bread/s (Block Reads/sec) and Bwrtn/s (Block Written/sec) into actual I/O. I have been told to divide this number by 512 as that is the size of each block.

What is the actual way of doing this???

 

[TrojanWarBlade]

Yyep, 512 looks right.
So you simply divide the number in half for K bytes so, for example, the 1003.61 is realistically about 500K/s.


Trojan.

 

[Chacalinc]

Actually, tps are IOPS (transactions per second).

Chacal, Inc.