The world of RAID-0, 0-1how tos ???????

taken · 21-07-2005, 02:50 PM

hi,

i have got 2 80 GB SATA HDD. well, what i want now is to configure them in RAID (??? ) this numbering am a bit confused. so, anyone out there who would help me to solve this problem???

heard that this set up SPEEEEEEEEEEDs up the computer performance.and i would like to explore it.

do hlp

digen · 21-07-2005, 03:08 PM

I would like to ask you to read the various RAID levels possible with 2 disks & then decide upon your requirement.
RAID Levels

Though each level has its own mertis & demerits like for say RAID 0 is striping,& if one disk fails you loose all your data irrespective whether the second disk is working or not.

Also to gain performance in certain RAID level scenarios you need a real hardware RAID PCI card.
Does your motherboard have onboard RAID? Which motherboard you got there?
I would suggest read up a bit on RAID levels,its pros & cons & then set it up practically.

siriusb · 21-07-2005, 03:57 PM

Raid-0 can't be called a raid. Maybe as AID, coz there's no redundancy.
To raid, u will need atleast 2 hard disks and a good raid hardware.
Even if u don't have the h/w, you can emulate it in s/w. Software raid works but is OS dependent and you cannot have the OS partition on the raided partitions. So it kinda loses its value since the OS boot time remains the same.

To raid in XP, here's a good how-to. Here's a very good article on Raid.

Keith Sebastian · 21-07-2005, 07:47 PM

Search for an article at Anandtech which concludes that Raid 0 doesn't do much w.r.t. real world performance and is really not worth the effort unless you're running disk I/O intensive server applications.

I almost went for 2 SATA in Raid 0 before I read this.

-Keith

hcp006sl · 21-07-2005, 08:51 PM

Short for Redundant Array of Independent (or Inexpensive) Disks, a category of disk drives that employ two or more drives in combination for fault tolerance and performance. RAID disk drives are used frequently on servers but aren't generally necessary for personal computers.

There are number of different RAID levels:
Level 0 -- Striped Disk Array without Fault Tolerance: Provides data striping (spreading out blocks of each file across multiple disk drives) but no redundancy. This improves performance but does not deliver fault tolerance. If one drive fails then all data in the array is lost.
Level 1 -- Mirroring and Duplexing: Provides disk mirroring. Level 1 provides twice the read transaction rate of single disks and the same write transaction rate as single disks.
Level 2 -- Error-Correcting Coding: Not a typical implementation and rarely used, Level 2 stripes data at the bit level rather than the block level.
Level 3 -- Bit-Interleaved Parity: Provides byte-level striping with a dedicated parity disk. Level 3, which cannot service simultaneous multiple requests, also is rarely used.
Level 4 -- Dedicated Parity Drive: A commonly used implementation of RAID, Level 4 provides block-level striping (like Level 0) with a parity disk. If a data disk fails, the parity data is used to create a replacement disk. A disadvantage to Level 4 is that the parity disk can create write bottlenecks.
Level 5 -- Block Interleaved Distributed Parity: Provides data striping at the byte level and also stripe error correction information. This results in excellent performance and good fault tolerance. Level 5 is one of the most popular implementations of RAID.
Level 6 -- Independent Data Disks with Double Parity: Provides block-level striping with parity data distributed across all disks.
Level 0+1 – A Mirror of Stripes: Not one of the original RAID levels, two RAID 0 stripes are created, and a RAID 1 mirror is created over them. Used for both replicating and sharing data among disks.
Level 10 – A Stripe of Mirrors: Not one of the original RAID levels, multiple RAID 1 mirrors are created, and a RAID 0 stripe is created over these.
Level 7: A trademark of Storage Computer Corporation that adds caching to Levels 3 or 4.
RAID S: EMC Corporation's proprietary striped pairty RAID system used in its Symmetrix storage systems.
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Source:http://www.webopedia.com
Some informations also here: http://www.staff.uni-mainz.de

mohit · 24-07-2005, 08:09 PM

@digen
hey does the Intel® Desktop Board D955XBK support true hardware raid or ill need another PCI RAID Card ?

Also i wanna know about Intel's RAID technology (Intel Matrix Storage) which allows for a combination of two RAID Levels such as 0+1 so that the user can benefit from the perfomance boost of the 0 level and the safety offered by level 1 ... how do u do this ? and is it good ?

hcp006sl · 24-07-2005, 10:09 PM

Quote:

Originally Posted by mohit

@digen
hey does the Intel® Desktop Board D955XBK support true hardware raid or ill need another PCI RAID Card ?

Serial ATA interfaces with RAID support:
8 x SATA (Serial ATA) for 4 SATA300 devices and 4 SATA150 devices — four of them are based on the chipset and support transfer rates of up to 300 MB/sec as well as other SATA-II functions; connected disks can form RAID 0, 1, 0+1 (10), and 5; the other four are based on an additional controller Silicon Image, supporting 150 MB/s transfer rates; connected disks can form RAID 0, 1, and 0+1.
Integrated Controller for RAID:
SATA RAID controller, based on Silicon Image 3114 chip, supporting 4 SATA150 devices that can form RAID 0, 1, and 0+1.
Source:http://www.digit-life.com/