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Can RAID Controllers act as non RAID controllers?
On Sun, 28 Sep 2008 09:52:27 -0500, "Peter Olcott"
wrote: "~misfit~" wrote in message ... Somewhere on teh intarwebs "kony" typed: On Fri, 19 Sep 2008 06:29:18 -0500, "Peter Olcott" wrote: A single-drive span is one that only has one member in it, is typically how a drive is used on any non-raid controller. I must keep the drives separate, yet not in any RAID configuration. What I must end up with is drive letters "C" through "Z". If the card supports 24 single drive spans, you would end up with drive letters C through Z. If the manual does not make both the factor of using single drive spans, AND supporting 24 of them clear, contact the manufacturer. Is this feature not what they call "JBOD" (Just a Bunch Of Disks)? I don't think so. I think that JBOD links the disks together into a single virtual drive. http://www.pcguide.com/ref/hdd/perf/...evels/jbod.htm Some people wholeheartedly disagree about this terminology :-) Spanning is spanning (and usually a bad idea for harddisks). JBOD is 'just a bunch of disks'. Meaning, that you should be able to add or remove just any of them, if you whish to do so. I for one have never seen a good argument for calling a spanned diskset JBOD. Nor do I know of a (more) proper term to describe a bunch of independant disks that happend to end up in a single enclusure :-) -- Kind regards, Gerard Bok |
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Can RAID Controllers act as non RAID controllers?
On Sun, 28 Sep 2008 09:52:27 -0500, "Peter Olcott"
wrote: "~misfit~" wrote in message ... Somewhere on teh intarwebs "kony" typed: On Fri, 19 Sep 2008 06:29:18 -0500, "Peter Olcott" wrote: A single-drive span is one that only has one member in it, is typically how a drive is used on any non-raid controller. I must keep the drives separate, yet not in any RAID configuration. What I must end up with is drive letters "C" through "Z". If the card supports 24 single drive spans, you would end up with drive letters C through Z. If the manual does not make both the factor of using single drive spans, AND supporting 24 of them clear, contact the manufacturer. Is this feature not what they call "JBOD" (Just a Bunch Of Disks)? I don't think so. I think that JBOD links the disks together into a single virtual drive. http://www.pcguide.com/ref/hdd/perf/...evels/jbod.htm With JBOD, the number of discs linked is determined by the user. You could indeed link 2, 4 or more... up to as many as the controller supports like this. On the other hand, with JBOD you can also choose to only have one drive per *array*, up to the maximum number of *arrays* (I actually mean logical volumes when array was written) that the controller supports. With this type of JBOD it is called a single drive span and is the same configuration as if the drive were connected to a motherboard with as many ports for each drive, not even hooked up to a raid controller at all. The question is one of what the specific controller card you are considering, actually supports... not the feature but how many separate volumes it supports using that feature. |
#13
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Can RAID Controllers act as non RAID controllers?
Somewhere on teh intarwebs "Gerard Bok" typed:
On Sun, 28 Sep 2008 09:52:27 -0500, "Peter Olcott" wrote: "~misfit~" wrote in message ... Somewhere on teh intarwebs "kony" typed: On Fri, 19 Sep 2008 06:29:18 -0500, "Peter Olcott" wrote: A single-drive span is one that only has one member in it, is typically how a drive is used on any non-raid controller. I must keep the drives separate, yet not in any RAID configuration. What I must end up with is drive letters "C" through "Z". If the card supports 24 single drive spans, you would end up with drive letters C through Z. If the manual does not make both the factor of using single drive spans, AND supporting 24 of them clear, contact the manufacturer. Is this feature not what they call "JBOD" (Just a Bunch Of Disks)? I don't think so. I think that JBOD links the disks together into a single virtual drive. http://www.pcguide.com/ref/hdd/perf/...evels/jbod.htm Some people wholeheartedly disagree about this terminology :-) Spanning is spanning (and usually a bad idea for harddisks). JBOD is 'just a bunch of disks'. Meaning, that you should be able to add or remove just any of them, if you whish to do so. I for one have never seen a good argument for calling a spanned diskset JBOD. Nor do I know of a (more) proper term to describe a bunch of independant disks that happend to end up in a single enclusure :-) I have to agree with you Gerard. Why would you call a spanned set of disks "just a bunch of disks"? It is what it is, just a bunch of disks. Cheers, -- Shaun. DISCLAIMER: If you find a posting or message from me offensive, inappropriate, or disruptive, please ignore it. If you don't know how to ignore a posting, complain to me and I will be only too happy to demonstrate... ;-) |
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