Hi,
I'm pulling my hair trying to figure out where the problem is. Here is the setup:
- Dell T7400 Workstation (Intel 5400 Chipset)
- 2 physical x Intel Xeon X5482 @ 3.2Ghz
- 64GB DDR2-5300F 667mhz ram (8x8GB)
- [Disabled] Onboard Perc 6/i (LSI 1068e SAS/SATA 3.0Gb)
- Dell Perc H700 Integrated, 6.0 Gb/s, 512MB, Has functional Battery, Forced Write back enabled, FW 12.10.3 (plugged to 16x PCIe 2.0) - Salvaged from a Dell T710 Server
- [Raid-0 on H700] 2 x Seagate Constellation ES 1 TB 7200 RPM SAS 2.0 6 GB/s (ST31000424SS) - Stripe size: 64KB
- 1 x Crucial M550 240GB SSD connected to onboard Sata AHCI @ 3.0Gb/s
The problem: If boot to a disk that has Win7x64 on it, I get disk speeds around 270MB/s from SAS Raid-0 to SSD or other way around. If I boot to ESXi 6.0/5.5/5.0 on the same machine without changing anything, I get disk speeds 100-110MB/s inside the VMs (ALL Thick disks, eager zeroed, Win2008R2 and Win2012R2). Copying between the datastores seems to have same speeds. I have tried various LSI drivers, flashed the H700 multiple times, Installed ESXi to different disks but nothing substantially changed. I played with Disk Share value on the VMs and increased to 4000 max, which resulted in extra 15MB/s increase in speed. I read numerous articles regarding disk queue depth, disk latency but the fact that Win7x64 gets the proper speeds pointing to non-hardware issue. Any help will be highly appreciated.
I'm pulling my hair trying to figure out where the problem is. Here is the setup:
- Dell T7400 Workstation (Intel 5400 Chipset)
- 2 physical x Intel Xeon X5482 @ 3.2Ghz
- 64GB DDR2-5300F 667mhz ram (8x8GB)
- [Disabled] Onboard Perc 6/i (LSI 1068e SAS/SATA 3.0Gb)
- Dell Perc H700 Integrated, 6.0 Gb/s, 512MB, Has functional Battery, Forced Write back enabled, FW 12.10.3 (plugged to 16x PCIe 2.0) - Salvaged from a Dell T710 Server
- [Raid-0 on H700] 2 x Seagate Constellation ES 1 TB 7200 RPM SAS 2.0 6 GB/s (ST31000424SS) - Stripe size: 64KB
- 1 x Crucial M550 240GB SSD connected to onboard Sata AHCI @ 3.0Gb/s
The problem: If boot to a disk that has Win7x64 on it, I get disk speeds around 270MB/s from SAS Raid-0 to SSD or other way around. If I boot to ESXi 6.0/5.5/5.0 on the same machine without changing anything, I get disk speeds 100-110MB/s inside the VMs (ALL Thick disks, eager zeroed, Win2008R2 and Win2012R2). Copying between the datastores seems to have same speeds. I have tried various LSI drivers, flashed the H700 multiple times, Installed ESXi to different disks but nothing substantially changed. I played with Disk Share value on the VMs and increased to 4000 max, which resulted in extra 15MB/s increase in speed. I read numerous articles regarding disk queue depth, disk latency but the fact that Win7x64 gets the proper speeds pointing to non-hardware issue. Any help will be highly appreciated.