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Author Topic: 3rd hard drive or replace hd  (Read 12466 times)

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thiemeje



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    Re: 3rd hard drive or replace hd
    « Reply #45 on: July 17, 2011, 12:21:39 PM »
    and goes on to say this.. which is the major debate about hot swapping HD's..

    Quote
    System/Operational designThere are two slightly differing meanings of the term hot swapping. It may refer only to the ability to add or remove hardware without powering down the system, while the system software may have to be notified by the user of the event in order to cope with it. Examples include RS-232 and lower-end SCSI devices. This is sometimes called cold plugging. However, if the system can detect and respond to addition or removal of hardware, it is referred to as true hot plugging. Examples include USB, FireWire and higher-end SCSI devices.

    Some implementations require a component shutdown procedure prior to removal. This simplifies the design, but such devices are not robust in the case of component failure. If a component is removed while it is being used, the operations to that device fail and the user is responsible for retrying if necessary, although this is not usually considered to be a problem.

    More complex implementations may recommend but do not require that the component be shut down, with sufficient redundancy in the system to allow operation to continue if a component is removed without being shut down. In these systems hot swap is normally used for regular maintenance to the computer, or to replace a broken component.

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    patio

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    Re: 3rd hard drive or replace hd
    « Reply #46 on: July 17, 2011, 02:32:01 PM »
    I'll stick by my statements...
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    rthompson80819



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    Re: 3rd hard drive or replace hd
    « Reply #47 on: July 17, 2011, 02:56:50 PM »
    The term hot swapable goes back several years and was originally designed for severs used in RAID configurations with both the drive and chassis specifically designed so that a drive could be changed with no loss of data.  These are commercial units with commercial prices.
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    patio

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    Re: 3rd hard drive or replace hd
    « Reply #48 on: July 17, 2011, 03:07:15 PM »
    Finally some semblance of reason...
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    BC_Programmer


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    Re: 3rd hard drive or replace hd
    « Reply #49 on: July 18, 2011, 02:40:47 AM »
    Somebody ought to correct the article than, for some reason they have this silly idea that USB was designed for hot swapping. Somebody ought to correct the USB specifications which make several references to that intended functionality.

    Or we can all put the blinders on and pretend that it's not hot-swappable to make Patio feel better.
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    thiemeje



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      Re: 3rd hard drive or replace hd
      « Reply #50 on: July 18, 2011, 06:39:13 PM »
      Well let him keep powering down his system to plug in a Hard drive, mouse, keyboard, phone, camera, etc,etc,etc,etc, not my problem... how ever i stick to my statement: hotspawable simply in all lamens terms means that you can plug and unplug an item into a system that is powered on.
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      BC_Programmer


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      Re: 3rd hard drive or replace hd
      « Reply #51 on: July 18, 2011, 07:05:54 PM »
      Quote from: rthompson80819 on July 17, 2011, 02:56:50 PM
      The term hot swapable goes back several years and was originally designed for severs used in RAID configurations with both the drive and chassis specifically designed so that a drive could be changed with no loss of data.  These are commercial units with commercial prices.
      Terms aren't "designed" and how a term was originally used has absolutely no bearing on what it means now. Also, the term in the context of RAID meant you could replace the drive while the system was on, and the array was in use. Warm swap meant you had to stop the computer from using the drive (by dismounting the RAID array) Cold swap meant you could power down, replace, power up, and the RAID array would work just fine with the new drive.

      Going by that terminology, a USB drive would be a Warm swappable device. So would a eSATA drive, which has the exact same issues with requiring the "safely remove" option, the only difference is that all eSATA drives are going to be recognized as fixed disks, and so they won't have any write-caching by default, but this is also the case for removable fixed Hard disks that connect via USB, so whatever term applies to one applies to the other.

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      Computer_Commando



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      Re: 3rd hard drive or replace hd
      « Reply #52 on: July 18, 2011, 07:15:00 PM »
      Quote from: rthompson80819 on July 17, 2011, 02:56:50 PM
      The term hot swapable goes back several years and was originally designed for severs used in RAID configurations with both the drive and chassis specifically designed so that a drive could be changed with no loss of data.  These are commercial units with commercial prices.
      Telcon switches in particular have had hot swappable CPU boards, etc for many years as do many commercial servers.  They now call them "blade servers" when used for internet applications.  http://en.wikipedia.org/wiki/Blade_server
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