What is the difference between spanned and striped volume?

Question

Hi,
I read about this subject and I can make conclusion that this is almost the same thing. Spaned volumes are created up to 32 disk and I presume with empty one but in OS it looks like single disk.
Striped volumes (RAID-0) are created from multiple disk. Unlike a spanned volume, however, data is written to all physical disks in the volume at the same rate.
Does this mean that with sppaned volumes data is written to first disk, when this one is full than will data be written to second one and so on. Is this the main difference ?

Answer 1

No, it is not the main diffrerence, here's why...

Spanned Volume - A dynamic spanned volume consists of two or more subdisks (contiguous disk regions) on one or more disks. With a spanned volume, you can combine sections of unallocated space from multiple dynamic disks into one large volume. The areas of unallocated space used to create spanned volumes can be different sizes. Spanned volumes are organized sequentially—that is, Array Manager sequentially allocates space on each disk until that disk is full and then continues with the next disk until the volume size is reached.

Spanned volumes can be extended. After a volume is extended, no portion of it can be deleted without deleting the entire spanned volume. Spanned volumes by themselves are not fault tolerant, but you can add data redundancy to a spanned volume by mirroring it to another disk.

NOTE: Spanning volumes across multiple disk controllers is not recommended.

Striped - Striped volumes are created by combining areas of free space on two or more disks into one logical volume. Data is divided into blocks and spread in a fixed order among all the disks in the volume. With a striped volume, data is written to multiple disks, similar to spanned volumes. However, striping writes files across all disks so that data is added to all disks at the same rate.

Striped volumes offer the best performance of all the disk management strategies. However, striped volumes do not provide fault tolerance. If a disk in a striped volume fails, the data in the entire volume is lost. You cannot mirror or extend a striped volume.

Slightly off topic, but FYI...
Concatenated Volumes - When you create a dynamic volume, simple and spanned dynamic volumes are combined together in an option called concatenated. In Array Manager, concatenation refers to storing data on either one array disk or on disk space that spans multiple array disks. When spanning more than one disk, concatenation enables the operating system to view multiple array disks as a single disk.

Data stored on a single disk can be considered a simple volume. This disk could also be defined as a virtual disk that comprises only a single array disk. Data that spans more than one array disk can be considered a spanned volume. Multiple concatenated disks can also be defined as a virtual disk that comprises more than one array disk.

In Array Manager, a dynamic volume that spans to separate areas of the same disk is also considered concatenated.

When an array disk in a concatenated or spanned volume fails, the entire volume becomes unavailable. Because the data is not redundant, it cannot be restored by rebuilding from a mirrored disk or parity information. Restoring from a backup is the only option.

Because concatenated volumes do not use disk space to maintain redundant data, they are more cost-efficient than volumes that use mirrors or parity information. A concatenated volume may be a good choice for data that is temporary, easily reproduced, or that does not justify the cost of data redundancy. In addition, a concatenated volume can easily be expanded by adding an additional array disk.

Answer 2

Spanned Volume

Answer 3

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RE:
What is the difference between spanned and striped volume?
Hi,
I read about this subject and I can make conclusion that this is almost the same thing. Spaned volumes are created up to 32 disk and I presume with empty one but in OS it looks like single disk.
Striped volumes (RAID-0) are created from multiple disk. Unlike a spanned volume, however, data...

Answer 4

Striped Volume

Answer 5

A spanned volume is created from free disk space that is linked together from multiple disks. You can extend a spanned volume onto a maximum of 32 disks. A spanned volume cannot be mirrored and is not fault-tolerant.

A striped volume is a volume whose data is interleaved across two or more physical disks. The data on this type of volume is allocated alternately and evenly to each of the physical disks. A striped volume cannot be mirrored or extended and is not fault-tolerant. Striping is also known as RAID-0.

http://www.microsoft.com/technet/prodtechnol/windows2000serv/maintain/optimize/c11w2kad.mspx

http://www.theeldergeek.com/hard_drives_10.htm

Answer 6

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Answer 7

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Fun fun Striped, also known as raid 0. this is where you take two or more hard drives and raid them together. the computer sees their volumes as one fused hard drive. so if I had three 500gb hard drives and I striped them, I would end up with 1.5tb in a raid 0 format. this is for performance. that is it's main advantage. the hard drives split data up evenly among themselves and you get the bennigfeit of multiple seakers looking for information. it's about %75 faster than a single hard drive. The disadvantage to this set up is that there is no back up in this set up. your operating system is split evenly on all the hard drive sin a raid 0 set up and if one disk dies, oyu loose everyhting. So, I use raid 0 for my oepratign system only and i put all of my data n a raid 1 or mirroered set up so I can't loose any of my data. Spanned is also known as jbod, or just a bunch of disks. this is essentially where you have those three hard drives, and the computer ignores any relationship between them and uses them as single drives. so you'd have hard drive a hard drive b and hard drive c, your operating system would be on one of them and if one fails, the other two can't help nor are they affected by it. The simple volume is similar to a jbod, but it only concerns the behavior of one drive. there are no partitions o it and this is usually referred as a simple hard drive storage solution. if you have one hard drive in oyur computer, this is the set up you have. There is also raid 1, raid 5, raid 0+1 and Raid 1+0 also raid 5+0. all of these have completely different characteristics pros and cons, but if oyu want to know more, email me, I will be happy to go into mor edetail for oyu. Hope this helps

Answer 8

Stripped data access is faster because you are writing data to multiple physical devices while you fill it up.