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Home > Archive > Server + > September 2002 > Pople,the server+ needs you! :D
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Pople,the server+ needs you! :D
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| twister166 2002-09-09, 6:26 pm |
| Well, one more before I hit the books for my exam tomorrow. I will be back later, may be, if I finish studying... 
C'on, people the server+ needs you!
Tech Ranger's server has four 9-GB drives that are hardware mirrored on an Ultra SCSI RAID controller. Using the same drives, he wants 63 GB of storage space. Which of the following would offer a solution with the highest performance?
A. RAID 5 with 4 additional drives
B. RAID 5 with 10 additional drives
C. RAID 0/1 with 4 additional drives
D. RAID 0/1 with 10 additional drives | |
| Supertech 2002-09-09, 7:48 pm |
| D. RAID 0/1 w/10 additional drives.
Set up a RAID-0 array across 7 disks for performance benefits. RAID-0 is ideal for high bandwidth applications, such as video production, editing, pre-press applications or any environment where read/write performance is paramount. A duplicate of the first stripe set is then mirrored on another 7-disk array for fault tolerance. RAID-1 should be used where cost and overall capacity are not as important as overall performance and fault tolerance. While this configuration provides all of the performance benefits of RAID-0 and the redundancy of RAID-1, this level is very costly to implement because a minimum of 14 disks are necessary to create a RAID 0/1 configuration of this capacity.
A RAiD 0/1 configuration can continue operations even when two disks have failed, provided that the two disks are not part of the same RAID-1 mirror set.
You should choose a stripe size relative to both the I/O segment size and the number of drives in the array, so that most I/O operations either:
* Do not cross stripes and involve only a single drive.
OR
* Cross many stripes and involve all drives in the array.
Typically, an I\O subsystem will be responding to requests to read data approx. 80% of the time. When read operations are the predominat type of I/O request, there is little difference among the three RAID levels available with a RAID controller. The primary consideration will be a compromise between the need for fault tolerance and the need for capacity and scalability. | |
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| Supertech 2002-09-09, 8:32 pm |
| For every write request, a RAID 5 array must perform two reads, two writes and two XOR operations to complete the original write operation. The cost of calculating and storing parity, rather than redundant data, is the extra time taken during write operations to regenerate parity info. A RAID 5 write operation is 33% to 60% slower than a RAID 1 write operation. | |
| twister166 2002-09-09, 9:09 pm |
| I guess, that is the FINAL Answer... | |
| Supertech 2002-09-09, 9:17 pm |
| I am cramming for my Adaptec Certified Storage Professional (ACSP) so this is good practice. Thx. | |
| namrak 2002-09-09, 9:17 pm |
| Okay this stuff is starting to worry me now. My server experience hasn't been in such a high, enterprise level environment needing multiple drives. Its all been on a smaller scale such as one to two servers, set tape backups scheme from previous jobs. Ack! I'm starting to go through the self-doubts now for Server+. What do you guys think? | |
| Supertech 2002-09-09, 9:22 pm |
| Think BIG. Be BIG.
Demand for storage is gonna be HUGE.
My plan is to get as far away from the desktop as I can.
and I'm getting deep into Convergence, too. | |
| twister166 2002-09-09, 9:31 pm |
| quote:
Originally posted by namrak
Okay this stuff is starting to worry me now. My server experience hasn't been in such a high, enterprise level environment needing multiple drives. Its all been on a smaller scale such as one to two servers, set tape backups scheme from previous jobs. Ack! I'm starting to go through the self-doubts now for Server+. What do you guys think?
The answer is really straight forward, SuperTech had gone into every single detail to provide un-mistakable answer and give no chance of anyone else to tell him that he is wrong... He made it look much harder than it is... | |
| namrak 2002-09-09, 9:58 pm |
| quote:
Originally posted by Supertech
Think BIG. Be BIG.
Demand for storage is gonna be HUGE.
My plan is to get as far away from the desktop as I can.
and I'm getting deep into Convergence, too.
Thanks guys! Methinks Supertech is scaring off people so he can get 6 digit salary figures all alone in area of storage and convergence. | |
| azimuth40 2002-09-09, 10:35 pm |
| Gee I ditched class yesterday when the teacher gave that question. Supertech can I borrow you notes. please can I can i huh |
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