wonderboy1953
banned
It's my understanding that RAID is useful in backing up files. Is RAID a hardware component? Is it in the form of software? What are its pros and cons?
RAID questions
- Thread starter wonderboy1953
- Start date
wolfeking
banned
I think it is a hardware component since it requires a driver.
RAID has several flavors.
RAID 0
-Faster than a standard hard drive. Slits data into 2 streams sending one to each drive. The advantage being speed nearly if not completely doubles. The disadvantage is you have no redundancy, and if one drive fails, then you loose all the data on both drives. Needs to be set up on matching pairs to work, and the computer reads it is one massive drive (called an array). The reason you loose all your data when 1 drive dies is because the computer can only read half the info. It would be like saying I ____ 35 ___ miles _ ago, and trying to finish the exact sentence with no clues to help you.
RAID 1
- Redundancy with no increase in speed at all. Just like when you sign a paper with a carbon sheet in between you sign both at real speed, the HDD does the same thing. If you lose one drive, then you can still run with a the single drive without losing a beat, or any downtime either. Requires two mirror drives, and you only get the capacity of one drive.
RAID 5:
I think this is the one that combines speed and redundancy, needing like 4 drives. Basically if you had 4 1TB drives in raid, you would have a double speed 2TB array with complete backups.
RAID has several flavors.
RAID 0
-Faster than a standard hard drive. Slits data into 2 streams sending one to each drive. The advantage being speed nearly if not completely doubles. The disadvantage is you have no redundancy, and if one drive fails, then you loose all the data on both drives. Needs to be set up on matching pairs to work, and the computer reads it is one massive drive (called an array). The reason you loose all your data when 1 drive dies is because the computer can only read half the info. It would be like saying I ____ 35 ___ miles _ ago, and trying to finish the exact sentence with no clues to help you.
RAID 1
- Redundancy with no increase in speed at all. Just like when you sign a paper with a carbon sheet in between you sign both at real speed, the HDD does the same thing. If you lose one drive, then you can still run with a the single drive without losing a beat, or any downtime either. Requires two mirror drives, and you only get the capacity of one drive.
RAID 5:
I think this is the one that combines speed and redundancy, needing like 4 drives. Basically if you had 4 1TB drives in raid, you would have a double speed 2TB array with complete backups.
RAID (redundant array of independent disks) is a form of hard disk drive management. It's hardware related, but controlled by software. There are only a few that are most common on standard user computers.
RAID0 is used for performance. Data is "stripped" along two drives. However if one drive fails, you will lose everything.
RAID1 is mirror backup. What it does is use two drives (Must be same size) and they will both be written simultaneously. That way, if one drive dies you have a regular backup.
RAID5 offers the best of both worlds. RAID 5 distributes parity along with the data and requires all drives but one to be present to operate; the array is not destroyed by a single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity such that the drive failure is masked from the end user. However, a single drive failure results in reduced performance of the entire array until the failed drive has been replaced and the associated data rebuilt.
RAID0 is used for performance. Data is "stripped" along two drives. However if one drive fails, you will lose everything.
RAID1 is mirror backup. What it does is use two drives (Must be same size) and they will both be written simultaneously. That way, if one drive dies you have a regular backup.
RAID5 offers the best of both worlds. RAID 5 distributes parity along with the data and requires all drives but one to be present to operate; the array is not destroyed by a single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity such that the drive failure is masked from the end user. However, a single drive failure results in reduced performance of the entire array until the failed drive has been replaced and the associated data rebuilt.
wonderboy1953
banned
Thank you
Even though voyagerfan99 doesn't like responses in titles, you have been helpful.
Is RAID simultaneously compatible with SSD and HDD? Also what happened to RAID 2-4? Now I have to thank voyagerfan99 too.
Even though voyagerfan99 doesn't like responses in titles, you have been helpful.
Is RAID simultaneously compatible with SSD and HDD? Also what happened to RAID 2-4? Now I have to thank voyagerfan99 too.
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Troncoso
VIP Member
To be honest, no one likes it.
If you mean, can you RAID an SSD with an HDD, then no. The hard drives must be matching. Ideally, you should use the same model.
You can RAID 2 or more SSD's or 2 or more HDD's but, not a mix.
I haven't seen any positives from a search. If you put a HDD and SSD in RAID together you'd lose performance.
wolfeking
banned
I think they dies in development. Pretty much offered little to no advantage to 0,1, and 5. There is a 10 and 15, but I haven't really searched them too much.
In RAID 2 (bit-level striping with dedicated Hamming-code parity), all disk spindle rotation is synchronized, and data is striped such that each sequential bit is on a different drive. Hamming-code parity is calculated across corresponding bits and stored on at least one parity drive.
In RAID 3 (byte-level striping with dedicated parity), all disk spindle rotation is synchronized, and data is striped so each sequential byte is on a different drive. Parity is calculated across corresponding bytes and stored on a dedicated parity drive.
RAID 4 (block-level striping with dedicated parity) is identical to RAID 5 (see below), but confines all parity data to a single drive. In this setup, files may be distributed between multiple drives. Each drive operates independently, allowing I/O requests to be performed in parallel. However, the use of a dedicated parity drive could create a performance bottleneck; because the parity data must be written to a single, dedicated parity drive for each block of non-parity data, the overall write performance may depend a great deal on the performance of this parity drive.
RAID 6 (block-level striping with double distributed parity) provides fault tolerance of two drive failures; the array continues to operate with up to two failed drives. This makes larger RAID groups more practical, especially for high-availability systems. This becomes increasingly important as large-capacity drives lengthen the time needed to recover from the failure of a single drive. Single-parity RAID levels are as vulnerable to data loss as a RAID 0 array until the failed drive is replaced and its data rebuilt; the larger the drive, the longer the rebuild takes. Double parity gives additional time to rebuild the array without the data being at risk if a single additional drive fails before the rebuild is complete.
In RAID 3 (byte-level striping with dedicated parity), all disk spindle rotation is synchronized, and data is striped so each sequential byte is on a different drive. Parity is calculated across corresponding bytes and stored on a dedicated parity drive.
RAID 4 (block-level striping with dedicated parity) is identical to RAID 5 (see below), but confines all parity data to a single drive. In this setup, files may be distributed between multiple drives. Each drive operates independently, allowing I/O requests to be performed in parallel. However, the use of a dedicated parity drive could create a performance bottleneck; because the parity data must be written to a single, dedicated parity drive for each block of non-parity data, the overall write performance may depend a great deal on the performance of this parity drive.
RAID 6 (block-level striping with double distributed parity) provides fault tolerance of two drive failures; the array continues to operate with up to two failed drives. This makes larger RAID groups more practical, especially for high-availability systems. This becomes increasingly important as large-capacity drives lengthen the time needed to recover from the failure of a single drive. Single-parity RAID levels are as vulnerable to data loss as a RAID 0 array until the failed drive is replaced and its data rebuilt; the larger the drive, the longer the rebuild takes. Double parity gives additional time to rebuild the array without the data being at risk if a single additional drive fails before the rebuild is complete.
paulcheung
Active Member
Raid 10 is the combination of Raid 0 and Raid 1. Two set of the drives, Best performance and best redundance, also the most expensive setup.
http://www.cyberciti.biz/tips/raid5-vs-raid-10-safety-performance.html
http://www.acronis.com/resource/tips-tricks/2005/whats-raid-10.html
http://www.cyberciti.biz/tips/raid5-vs-raid-10-safety-performance.html
http://www.acronis.com/resource/tips-tricks/2005/whats-raid-10.html
zombine210
New Member
i didn't notice anybody else mentioning this, or if they did, i don't think it was clear enough:
RAID is not a substitute for backups.
the main purpose for RAID is high availability. the more common RAID levels used in industry are RAID 1 and RAID 5 for higher capacity servers like file sharing. all those other fancy raid levels are too expensive and add complexity to an operation.
i once saw a server, which my department inherited, that came with RAID 1-0 or something weird like that. you could tell right away whoever built it had no idea what they were doing.
you can get by with a software raid controller card for a home server, but for best performance and features, hardware raid is the way to go, albeit more expensive.
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1: Enable RAID in BIOS
2: Reboot computer. When the RAID configure keystoke appears, press it and configure it.
3: Configure RAID in the utility
If it's a newer Vista or 7 computer, you can put the RAID driver on a flash drive. When the drive select/format window appears, install the RAID driver and continue with the installation.
XP and older uses the RAID driver on a floppy disk.