sql disk io

short reblogged from http://www.mssqltips.com/sqlservertip/2127/benchmarking-sql-server-io-with-sqlio/ 1) change param.txt to bigger testfile (10Gb) and correct drive: param.txt c:\testfile.dat 8 0x0 10240 #name threads cpuaffinity sizeInMB 2) create testfile: sqlio -kW -s5 -fsequential -o4 -b64 -Fparam.txt C:\Program Files (x86)\SQLIO>sqlio -kW -s5 -fsequential -o4 -b64 -Fparam.txt sqlio v1.5.SG parameter file used: param.txt file c:\testfile.dat with 8 threads (0-7) using mask 0x0 (0) 8 threads writing for 5 secs to file c:\testfile.dat using 64KB sequential IOs enabling multiple I/Os per thread with 4 outstanding size of file c:\testfile.dat needs to be: 10737418240 bytes current file size: 0 bytes need to expand by: 10737418240 bytes expanding c:\testfile.dat ... done. using specified size: 10240 MB for file: c:\testfile.dat initialization done CUMULATIVE DATA: throughput metrics: IOs/sec: 1327.03 MBs/sec: 82.93 VM on HyperV on SSD Raid,other examples: Al: IOs/sec: 3862.24 MBs/sec: 241.39 3) RANDOM WRITE TEST: (-d ... Drive -s seconds -t threads simultan) sqlio -dC -BH -kW -frandom -t1 -o1 -s60 -b64 \testfile.dat sqlio -dC -BH -kW -frandom -t2 -o1 -s60 -b64 \testfile.dat sqlio -dC -BH -kW -frandom -t4 -o1 -s60 -b64 \testfile.dat sqlio -dC -BH -kW -frandom -t8 -o1 -s60 -b64 \testfile.dat C:\Program Files (x86)\SQLIO>sqlio -dC -BH -kW -frandom -t1 -o1 -s90 -b64 \testfile.dat sqlio v1.5.SG 1 thread writing for 90 secs to file C:\testfile.dat using 64KB random IOs enabling multiple I/Os per thread with 1 outstanding buffering set to use hardware disk cache (but not file cache) using current size: 10240 MB for file: C:\testfile.dat initialization done CUMULATIVE DATA: throughput metrics: IOs/sec: 1082.02 MBs/sec: 67.62 Al -t1: IOs/sec: 915.90 MBs/sec: 57.24 4)RANDOM READ TEST: sqlio -dC -BH -kR -frandom -t1 -o1 -s60 -b64 \testfile.dat sqlio -dC -BH -kR -frandom -t2 -o1 -s60 -b64 \testfile.dat sqlio -dC -BH -kR -frandom -t4 -o1 -s60 -b64 \testfile.dat sqlio -dC -BH -kR -frandom -t8 -o1 -s60 -b64 \testfile.dat C:\Program Files (x86)\SQLIO>sqlio -dC -BH -kR -frandom -t1 -o1 -s30 -b64 \testfile.dat sqlio v1.5.SG 1 thread reading for 30 secs from file C:\testfile.dat using 64KB random IOs enabling multiple I/Os per thread with 1 outstanding buffering set to use hardware disk cache (but not file cache) using current size: 10240 MB for file: C:\testfile.dat initialization done CUMULATIVE DATA: throughput metrics: IOs/sec: 2409.36 MBs/sec: 150.58 Al: IOs/sec: 278.00 MBs/sec: 17.37