Read performance PERC H710 on R720

Question

Hi I have a server R720 (64Gb RAM) with PERC H710 mini and 2x600GB SAS in RAID 1 (Rent in hetzner.de) OS: Vmware ESXi 5.5 U2 Dell Edition My application use MS SQL sevrer. After a few days of use, I realized that there are performance issues. I copied the virtual machines on a cheap server with disk SATA (2x2Tb Raid1, LSI 9260-4i). This server performance is much higher than Dell. After reading this www.brentozar.com/archive/2008/09/finding-your-san-bottlenecks-with-sqlio  I ran some tests the disk system using SQLIO. Four tests: sqlio -kW -t8 -s120 -o8 -frandom -b8 -BH -LS E:\TestFile.datsqlio -kR -t8 -s120 -o8 -frandom -b8 -BH -LS E:\TestFile.datsqlio -kW -t8 -s120 -o8 -fsequential -b64 -BH -LS E:\TestFile.datsqlio -kR -t8 -s120 -o8 -fsequential -b64 -BH -LS E:\TestFile.dat In the write mode Dell has a better performance. In the read mode (my application often uses this mode): DELL (SAS disks): IOs/sec:  2916.24MBs/sec:   182.26latency metrics:Min_Latency(ms): 0Avg_Latency(ms): 21Max_Latency(ms): 1515 Noname server (SATA disks): IOs/sec:  4079.51MBs/sec:   254.96latency metrics:Min_Latency(ms): 0Avg_Latency(ms): 15Max_Latency(ms): 403 My virtual disk in dell have a read policy: adaptive read ahead write policy: force write back Can you advise on how to improve the read performance? Thanks a lot.

kiribool · Answer

Controller firmware version: 21.3.1-0004 Controller driver version: 06.803.52.00 SAS Disk ProductID : ST3600057SS SAS Disk Revision : ES66

PowerEdge HDD/SCSI/RAID

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