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Discussion in 'Electronic Basics' started by joji john, Oct 19, 2004.

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  1. joji john

    joji john Guest

    Hi all,
    I've all read the descriptions of these 2 bus specifications. Nowhere have I
    seen electrical specification particularly regarding hot swap cabability.Can
    anyone drop me pointers regarding:
    a) Electrical signals in SCSI that makes hot-swap(level 4) a possibility.
    b) What can be done (externally) to make ATA/IDE hot swappable (level 4)

  2. Mike

    Mike Guest

    The ability for SCSI to be hot-swappable is functionality of a RAID
    controller. Most levels of RAID can endure the failure of a disk and not be
    compromised. Try looking at some RAID controller docs....

    The purpose of having a disk hot-swappable is to allow the system to
    continue running as if there was a disk there to compensate for the bad
    disk. If you have only one disk drive, that can't be achieved.

  3. I think serial-ATA has better support for hot-swapping compared with

  4. Lord Garth

    Lord Garth Guest

    I've used the Rocket Raid 133 product for hot swapping IDE drives...

    Here is a quote from the Highpoint-tech product literature:

    Data Security
    For RAID 1 and 0+1, the RocketRAID 133 provides disk mirroring, hot-spare
    options for automatic array-rebuilds, hot-swap support for swapping failed
    disks on the fly (works with Hot-Swap capable mobile racks such as Rocket
    Mate), and disk failure notification (audible alarms, visual warning
    messages). These features provide a high level of security and data
    protection against hard disk failure.

    Here is their url:
  5. Rich Grise

    Rich Grise Guest

    Design a hot-swappable interface for the IDE or SCSI to plug into. I think
    that even if you could make them hot-pluggable, it still wouldn't work
    because of the intimate device/processor connection that has to be all
    configured and stuff at boot time.

    They might be "plug and play," but that really only applies to stuff
    that's plugged in while power is off; it means that the S/W can detect
    the ports and stuff.

  6. Lord Garth

    Lord Garth Guest

    Rich, the RocketRAID board has its own BIOS and can be hotswapped....
    I use it with removable drive trays to replace tape drives.
  7. Rich Grise

    Rich Grise Guest

    Thanks for the clarification. As far as RAID, I'm pretty sure that
    the "R" is for "Redundant," but that's about it. :)


  8. RAID = Redundant Array of Inexpensive Disks
  9. Kevin Kilzer

    Kevin Kilzer Guest

    It is easier if the drive is behind a RAID controller:

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