Minimum Flash requirement for IOS image

Discussion in 'Cisco' started by realdreams, May 18, 2010.

  1. realdreams

    realdreams Guest

    image:
    IP
    c3620-i-mz.123-26.bin
    Release Date: 18/Mar/2008
    Size: 8031.25 KB (8223996 bytes)
    Minimum Memory: DRAM:48 MB Flash:32 MB

    This image is only 8MB,why it requires 32MB Flash since basically
    Flash is used to store IOS image?
    Is it true that generally I can copy an image to a Flash a little bit
    larger than the image?As long as I can copy it to flash,I can run
    it,right?

    In flash requirement,I never see sizes like 24MB.Is it because the
    Flash requirement only has 8,16,32 and so on and those irregular sizes
    are not considered but I can still run a image smaller than my
    Flash.For example,run this image with 8MB+4MB SIMM Flash.

    Thanks.
     
    realdreams, May 18, 2010
    #1
    1. Advertising

  2. realdreams

    bod43 Guest

    On 18 May, 07:08, realdreams <> wrote:
    > image:
    > IP
    > c3620-i-mz.123-26.bin
    > Release Date: 18/Mar/2008
    > Size: 8031.25 KB  (8223996 bytes)
    > Minimum Memory: DRAM:48 MB  Flash:32 MB
    >
    > This image is only 8MB,why it requires 32MB Flash since basically
    > Flash is used to store IOS image?
    > Is it true that generally I can copy an image to a Flash a little bit
    > larger than the image?As long as I can copy it to flash,I can run
    > it,right?


    Yes.

    In my experience if the image will fit the flash it will boot,
    always.

    Some platforms use flash for config storage and there is a
    small formatting overhead so you need to check the actual
    free space with sh flash.

    8223996 is awfully close to 8M and so it may well not fit
    into 8M or it might:) Also depends on whether
    1M is 1,000 x 1,000 or 1,000 * 1,024 or 1,024 x 1,024:-(

    If you want to use the on board web interface thingy
    then you need more flash. The stated flash requirements
    for modern routers includes the web thing (ah yes SDM -
    I finally recalled).
     
    bod43, May 18, 2010
    #2
    1. Advertising

  3. realdreams

    bod43 Guest

    Also worth remembering that you can do a network boot.
    Not exactly a good idea for production but for a lab
    it would be worth considering.
     
    bod43, May 18, 2010
    #3
    1. Advertising

Want to reply to this thread or ask your own question?

It takes just 2 minutes to sign up (and it's free!). Just click the sign up button to choose a username and then you can ask your own questions on the forum.
Similar Threads
  1. Chris
    Replies:
    16
    Views:
    516
    Chris
    Apr 18, 2004
  2. mark.worthington

    Minimum PC requirement

    mark.worthington, Apr 15, 2004, in forum: Digital Photography
    Replies:
    10
    Views:
    576
    Andrew
    Apr 16, 2004
  3. Arawak
    Replies:
    6
    Views:
    474
    Arawak
    Dec 23, 2005
  4. Rachana

    What is minimum hardware requirement for VS2008?

    Rachana, Jan 8, 2008, in forum: Computer Support
    Replies:
    3
    Views:
    1,945
  5. Giuen
    Replies:
    0
    Views:
    1,261
    Giuen
    Sep 12, 2008
Loading...

Share This Page