Hi all,Iam using RHEL6.4 32 bit.I have connected 5 hard drives to my PC.After I boot the system in disk utility i see all the 5 drives connected to it.But when i hotunplug any drive this does not show any effect in Disk utility.This means Disk utility still displys my unplugged drive.Iam not able to understand whats happening.

Regards,

Please explain in a bit more detail.

- Are these usb disks?
- What do you mean by "connected"? Are they (automatically) mounted or do they show up as being detected (but not mounted)?

In general: You need to unmount a disk before physically disconnecting it (assuming you do not have specialized equipment [do you??]).

These are not USB disks.I have connected 5 drives to Expander.Disk utility at GUI displays all the available drives.But when we remove them it does not updates in GUI

So, no specialized equipment that allows hot-swapping.

That sounds correct.

As stated before: You need to unmount the disk(s) before removing them. Not doing so might damage the content of the disk(s).

But it gets updated in /proc/scsi/scsi right...

Yes, it does. It will also show up in /dev/disk/by-id.

Neither of those will show if something is mounted, it just tells that a device is connected and, in the case of /dev/disk/by-id, which partitions (if any) are available.

If you unplug a mounted device, it will not (immediately) show as being disconnected. In time the system will notice this.

So What you mean to say is The disk utility will have only information when any drive is inserted but not with removing..!!!!

No, I'm not. When a device is WRONGFULLY removed it will stay visible.

I'm assuming the following happens (in short):

1 - You insert a device.
2 - Device is picked up by the system.
3 - Device is (auto) mounted.
4 - Device is removed (without unmounting it).
5 - Device is still present according to the system due to not unmounting it.
6 - After time passes, system might pick up the missing device and remove it.

You should ALWAYS unmount a device before removing it. Not doing so might get you into trouble:
- devices are shown while they aren't there any more,
- data might get corrupted,
- disk might get corrupted.

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