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Hard drive capacity and performance

Rohit Khatri
Intellectual 990 points

Hi,

Is there any affect on overall performance if capacity of hard disk increased to 8TB or 16TB from 6TB?

Processor is DM8168 for Digital Video Recorder and file system used is EXT4.

Regards

Rohit Khatri

  • 0
    TI__Guru**** 170625 points
    Hi Rohit,

    The performance should be impacted on the speed of the hard disk. So I would suggest you to check the speed of these 6/8/16TB disks. You can also double check with the hard disk supplier.

    See also the below wiki pages, which discuss SATA performance:
    processors.wiki.ti.com/.../TI_SATA_FAQ
    processors.wiki.ti.com/.../TI81XX_PSP_04.04.00.02_Feature_Performance_Guide
    processors.wiki.ti.com/.../Sitara_PSP_Test_Setup

    Regards,
    Pavel
  • 0 in reply to Pavel Botev
    Intellectual 990 points
    Hi Pavel,

    Thanks.........for the reply.

    I understand that ultimate speed of read/write will depend on speed of hard disk.
    But, my question is. If i attach 8TB or 16TB hard disk than is there any effect on system's performance in terms of memory(ram) requirement and in terms of CPU usage??

    Currently, we are supporting upto 6TB hard disk. And we are planning to increase maximum supported hard disk size to 8TB.

    Regards,
    Rohit Khatri
  • 0 in reply to Rohit Khatri
    TI__Guru**** 170625 points

    Rohit,

    The performance depends on: CPU speed, DDR/memory speed, filesystem used, cache size, linux lernel version, HDD disk.

    If only HDD disk is different (larger in size), you can check the data rate (throughput number) in these HDD disks datasheets to compare.

    We can improve performance by tuning filesystem (in example VFAT) parameters during filesystem creation. The two parameters which could be considered are, number of sectors per cluster and logical sector size. Modifying these parameters will vary the disk usage space and disk space wastage. Hence tradeoff has to be made between disk size and performance.

    1. Sectors per cluster - 8, Logical sector size (bytes) - 512 : Improvement 1X      (mkfs.vfat –F 32 /dev/sda1)

    2. Sectors per cluster - 32, Logical sector size (bytes) - 512 : Improvement 2X    (mkfs.vfat -F 32 -s 32 -S 512 -v /dev/sda1)

    3. Sectors per cluster - 16, Logical sector size (bytes) - 4096 : Improvement 3X  (mkfs.vfat -F 32 -s 16 -S 4096 -v /dev/sda1)

    You can also run performance test on these 3 HDD disks to compare the results:

    Regards,

    Pavel

  • 0 in reply to Pavel Botev
    Intellectual 990 points
    Hi Pavel,

    I got the point that data read/write speed depends on all above parameter.

    But I am not much worried about data read/write speed. I have concern of system performance(RAM and CPU usage).

    Suppose if i connect 6TB hard disk and created 6TB EXT4 partition than my system is taking some amount of RAM and CPU usage for reading and writing data. Now if i connect 8TB hard disk and make partition of 8TB EXT4 and reading /writing same amount of data than will amount of RAM and CPU usage required by system change? ??

    Regards,
    Rohit Khatri
  • 0 in reply to Rohit Khatri
    TI__Guru**** 170625 points
    Rohit,

    I do not expect the CPU/RAM usage to change in this case (read/write the same amount of data), but this test case is not tested and not verified.

    Regards,
    Pavel