I/O Performance issue
Posted: 4. Jul 2008, 02:13
Hello,
I'm using VirtualBox 1.6 (closed source version) on an AMD64 host running Linux. I created a guest with a VDI hard disk that I converted from a raw dd image and attached it to the virtual SATA controller.
Inside the guest, Linux is also the OS and it perfectly recognizes the disk using AHCI.
However, when I test the read and write speed to the disk, the results are very poor (read with hdparm -t at about 20 mb/s even after the third time...) and write speed at 10-13 mb/s using dd to overwrite an existing file with zeros (I chose an existing huge file that I created before to avoid penalties caused by a possible VDI resizing).
Are there any known issues that lead to such poor I/O performance? If you need additional information, I'll be glad to supply it.
Thanks in advance and best regards,
Chris
I'm using VirtualBox 1.6 (closed source version) on an AMD64 host running Linux. I created a guest with a VDI hard disk that I converted from a raw dd image and attached it to the virtual SATA controller.
Inside the guest, Linux is also the OS and it perfectly recognizes the disk using AHCI.
However, when I test the read and write speed to the disk, the results are very poor (read with hdparm -t at about 20 mb/s even after the third time...) and write speed at 10-13 mb/s using dd to overwrite an existing file with zeros (I chose an existing huge file that I created before to avoid penalties caused by a possible VDI resizing).
Are there any known issues that lead to such poor I/O performance? If you need additional information, I'll be glad to supply it.
Thanks in advance and best regards,
Chris