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SCSI vs IDE

J

joji john

Jan 1, 1970
0
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)

Thanx,
Joji
 
M

Mike

Jan 1, 1970
0
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.

Mike
 
D

Daniel Kelly \(AKA Jack\)

Jan 1, 1970
0
I think serial-ATA has better support for hot-swapping compared with
parallel-ATA.

Thanks,
Jack
 
L

Lord Garth

Jan 1, 1970
0
joji john said:
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)

Thanx,
Joji


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: http://www.highpoint-tech.com
 
R

Rich Grise

Jan 1, 1970
0
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)

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.

Sorry.
Rich
 
L

Lord Garth

Jan 1, 1970
0
Rich Grise said:
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.

Sorry.
Rich


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

Rich Grise

Jan 1, 1970
0
Rich, the RocketRAID board has its own BIOS and can be hotswapped....
I use it with removable drive trays to replace tape drives.
Thanks for the clarification. As far as RAID, I'm pretty sure that
the "R" is for "Redundant," but that's about it. :)

Cheers!
Rich
 
J

James T. White

Jan 1, 1970
0
Rich Grise said:
Thanks for the clarification. As far as RAID, I'm pretty sure that
the "R" is for "Redundant," but that's about it. :)


RAID = Redundant Array of Inexpensive Disks
 
K

Kevin Kilzer

Jan 1, 1970
0
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)

It is easier if the drive is behind a RAID controller:
SCSI: http://www.adtron.com/family_detail.html?prod=SC6M
IDE: http://www.adtron.com/family_detail.html?prod=IC6MB

Kevin
 
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