220-901 question 11 discussion

answered

You would like to build a PC for storage redundancy. Select the appropriate IDE drives and
build the PC for MAXIMUM performance, while using the MINIMUM amount of drives.


Created 6 months ago by 501teconss

aaronbailey

RAID 1 is NOT MAXIMUM Performance. RAID 5 is the correct answer. OR, reword the question so that we know we are only allowed to use 2 drives in the 3 bays that are shown available.

Sarturas

It says use the MINIMUM number of drives

iverzc

Don't assume 2 drives = RAID 1, you are forgetting RAID 0 which will yield maximum performance in this scenario.

grizzly557

Why wouldn't it be two 15,000 HDDs?

JonR

It asks for the IDE drives. The 15,000 and 10,000 are SATA.

PIT_boy

Actually the top 2 look more like SCSI drives. I've been viewing various pics online, and the top 2 don't have the typical horizontal "L" shaped SATA connectors.

PIT_boy

I recant my statement. I thought the images above were cut off.

anthony1978

my confusion is based on there only being one "Hard Drive 3" 7200 RPM to choose from on the right, but the answer shows its two of them. it says "drives can be reused" but that contradicts my understanding of storage redundancy. perhaps i need 2 study this topic again.

Crumpy3

Took the exam 2 weeks ago and this was on there.

garnettkevin2123

RAID 5 is no longer using the minimum amount of drives (requires 3 drives) in comparison to the other RAIDs, so it will not meet the minimum drive requirement presented in the question. Although RAID 0 meets the requirement of "minimum drives", it has "ZERO" redundancy (one drive fails, then you have to start over), so it will definitely not work. RAID 1+0 (RAID 10) will not work because it doesn't meet the requirement of "minimum drives" (minimum for RAID 10 is 4 discs or 2 arrays). Out of all RAIDs, RAID 1 is the logical answer because it only requires 2 drives (the minimum in comparison to the other RAIDs), and it has redundancy (mirroring presents one drive as a backup if the other were to fail, you can still continue without starting over). RAID 1 still achieves maximum performance because the processor and memory doesn't have to work extra hard to rebuild the other drive. RAID 5 doesn't achieve the maximum performance because it has to work extra hard to rebuild the failed drive using the parity data from the 2 drives that are still running, which can slow the system down. I believe Comptia's purpose behind this question is because they want to test the test-taker to see if they know what type of RAID needs to be applied in this simulation. The reason why they put the third drive slot there is to provide room for error. It'll tempt the test-taker to "assume" that if there are three slots, that must mean we need to use all of it. NOT TRUE!

xxXD_dankkushsniper_DXxx

The question is worded properly, it tells you to use the maximum performance IDE drives, in this case it's the 7,200 RPM IDE drive, and it asks for you to use the minimum amount of drives, which you should know the minimum for is 2.

mjacklich

"Maximum Performance". If you mean "Maximum Performance IDE drives, the exam question should be worded to say that. Just sayin'. I agree, the way it is worded, Raid 5 would be appear to be correct.

Slaven

If RAID 5 is correct answer, then minimum amount of drives in RAID 5 is three. RAID 5 to works need minimum of 3 drives?

LunchBox007

In the first part of the question it asks for redundancy, with minimum hardware in turn would allow for Maximum Performance.

dnelson44

Can anyone explain why it would be the 7200 RPM Hard Drive and not one of the others?

mfahadjalil

Its clearly mention to use IDE drives, if you look closer then first two are not IDE drives so you can easily eliminate first two options.

Mwilk27

It mentions in the question that you have to use IDE drives. The other two drives are SATA.

Bender

^^ what they said. It's tricky if you don't look at the connectors lol.

annieriomaze07

Hard drive 3-7,200 RPM Hard Drive 3-7,200 RPM

Lanai

HDD operating at speeds 5400 RPM and 7200 RPM are used primarily for greater speed/performance. However HDD at speeds 10000 and 15000 RPM are mainly for greater storage capabilities. The question wants that we use minimum drives which is 2 because a RAID requires at least 2 drives, and as mentioned earlier 5400 RPM and 7200 RPM are used primarily for greater speed/performance, so we would use 7200 RPM seeing that it offers greater speed/performance than RPM.

orocubano77

BAY 1 = HDD3 BAY 2 = HDD3

need2know

I understood this question like this 1.you would like to build a PC for storage redundancy.--- could be RAID 1, 5 , OR 10. 2.Select the appropriate IDE drives --- The top two drives are SATA so they do not fit for this question. 3.build the PC for MAXIMUM performance, while using the MINIMUM amount of drives.--- Maximum performance should be RAID 10 based on my understanding, but it requires at least four drives, RAID 5 requires at least three drives, and RAID 1 requires at least two drives. So my answer is using two HDD 3 - 7200 RPM, 7200 RPM is faster than 5400 RPM HDD.

anonynoob1

Aaron Bailey, you are incorrect. Volume spanning IS max perf, but ofers NO redundancy. RAID 5 is striping and offers MAX redundancy but not max perf. This is a TRICK question...ALL OF THE higher RPM disks are SATA drives. Question asks for IDE disks!

pfountotos

Great question! Only issue is "drag line" feature doesn't seem to work.

theta-sigma

I was wrong as well... It asks for "Redundancy" NOT "Parity" Therefor a raid 5 is unnecessary. The Raid 1 with the higher RPMs would be correct. I missed the IDE when reading it.