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Reptar
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Posted - 2004.05.18 13:19:00 -
[1]
After much confusion i was wondering if anybody knows how RAID 5 works (Striped with Parity), does it work in a simliar way to Norton Ghost? Im stumped can somebody please point me to some resources as ive searched but found no answers. |
DeathBunny
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Posted - 2004.05.18 16:28:00 -
[2]
RAID 5
Think on the lines of RAID 1 (speed) and RAID 0 (security) with the hot swap option if a drive goes down.
For instance having needing a min of 3 drives to start you only get 2 Drives worth of true storage. Theres a little more overhead in having this due to if a file is created its still created on 2 drives. Its a nice setup to have security and speed though. The more drives you add the faster it is.
If not mistaken its similar to another RAID setup. Can't remember the number but All drives are in a RAID and 1 drive is the parity drive. With RAID 5 it eliminates the parity only drive and spreads it across the actual drives in use.
Hope this helps if not sign up on this site Linky and ask some questions about it. There very helpful.
Fear The Bunny
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Rafe Waddo
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Posted - 2004.05.18 20:04:00 -
[3]
Edited by: Rafe Waddo on 18/05/2004 20:08:41
You can try this article on Ars Technica: http://arstechnica.com/paedia/r/raid-1.html
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Reptar
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Posted - 2004.05.23 14:44:00 -
[4]
cool thanks guys im starting to get it 
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Domalais
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Posted - 2004.06.05 02:42:00 -
[5]
 Originally by: DeathBunny
Think on the lines of RAID 1 (speed) and RAID 0 (security) with the hot swap option if a drive goes down.
I think you flip flopped those. RAID 1 is mirroring (security), RAID 0 is striping (speed).
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Necronomicon
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Posted - 2004.06.28 09:59:00 -
[6]
Edited by: Necronomicon on 28/06/2004 10:02:35
Edited by: Necronomicon on 28/06/2004 10:01:31
RAID5 is actually distributed parity, RAID3 uses a single drive to store the parity information, whereas RAID5 stipes the parity across all drives in the array along with the data. Both RAID3&5 have a single drive overhead and a minimum of 3 drives in the array.
RAID0 is drive striping, and has no resilience, RAID1 is drive mirroring and has 50% redundacy overhead.
For the best performance, a hybrid RAID 1+0 uses both striping and mirroring, again has a 50% redundancy overhead.
(BTW, letting software do this causes a HUGE cpu overhead, always use a RAID controller, they are very cheap now)
Starsi dont make Eve Pilots, but if they did, i wouldnt be one of them. |
Adalente
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Posted - 2004.07.08 16:45:00 -
[7]
If your knowledge of RAID is limited to what you learned on an EVE forum, don't even attempt to play with it. No offence meant.
/2 cents
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Adalente
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Posted - 2004.07.08 16:45:00 -
[8]
If your knowledge of RAID is limited to what you learned on an EVE forum, don't even attempt to play with it. No offence meant.
/2 cents
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Reptar
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Posted - 2004.07.10 20:44:00 -
[9]
lol well i got it now the idea of the forumlas for a server 2003 manual, not going to play with it, just intrested
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Reptar
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Posted - 2004.07.10 20:44:00 -
[10]
lol well i got it now the idea of the forumlas for a server 2003 manual, not going to play with it, just intrested
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Rhombus
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Posted - 2004.07.15 18:40:00 -
[11]
Edited by: Rhombus on 15/07/2004 18:49:02
Hi,
RAID 0 (Disk striping)
Building an array from multiple drives. No security - if one drive fails, all is lost. 
RAID 1+2 (Disk mirroring)
Provides a mirror of 1 drive by using one or two channels of the RAID-controller. Secure but 50% loss of capacity. Such a system can not be expanded dynamically by plugging in more disks, it is handled as 1 drive by the OS!! 
RAID 3+4 (Disk striping with parity disk)
Can be expanded by adding drives to the stripe. Secure if a drive fails, because the parity-disk keeps the system running. But, the parity drive is always working on every write to any of the disks and so this setup is not really good. It should be used for fileservers with large files (like video-servers for streaming or such), not for OSes with directories like /windows . 
RAID 5 (Stripe with distributed parity)
Best setup for small and medium size servers. Can be expanded as needed by adding drives and offers 33% of the total capacity. The distributed parity is optimal for performance and the system will work without a difference if a drive fails. 
RAID 10
Combination of RAID 0 and RAID 1 are called RAID 10. These can be horribly fast, but have a bad capacity. As you may think, loosing 1 drive means to build up the whole broken RAID 0 stipeset again, what could be some work for the system. Minimumof 4 drives needed. 
RAID 50
Combination of RAID 0 and RAID 5.... Minimum of 6 drives needed.
Hope this helps.
Regards,
Rhombus
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Rhombus
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Posted - 2004.07.15 18:40:00 -
[12]
Edited by: Rhombus on 15/07/2004 18:49:02
Hi,
RAID 0 (Disk striping)
Building an array from multiple drives. No security - if one drive fails, all is lost.
RAID 1+2 (Disk mirroring)
Provides a mirror of 1 drive by using one or two channels of the RAID-controller. Secure but 50% loss of capacity. Such a system can not be expanded dynamically by plugging in more disks, it is handled as 1 drive by the OS!!
RAID 3+4 (Disk striping with parity disk)
Can be expanded by adding drives to the stripe. Secure if a drive fails, because the parity-disk keeps the system running. But, the parity drive is always working on every write to any of the disks and so this setup is not really good. It should be used for fileservers with large files (like video-servers for streaming or such), not for OSes with directories like /windows .
RAID 5 (Stripe with distributed parity)
Best setup for small and medium size servers. Can be expanded as needed by adding drives and offers 33% of the total capacity. The distributed parity is optimal for performance and the system will work without a difference if a drive fails.
RAID 10
Combination of RAID 0 and RAID 1 are called RAID 10. These can be horribly fast, but have a bad capacity. As you may think, loosing 1 drive means to build up the whole broken RAID 0 stipeset again, what could be some work for the system. Minimumof 4 drives needed.
RAID 50
Combination of RAID 0 and RAID 5.... Minimum of 6 drives needed.
Hope this helps.
Regards,
Rhombus
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cmaxx
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Posted - 2004.07.22 20:50:00 -
[13]
If you really want to know, find a copy of Garth Gibson's thesis, it's published in book form.
Also The RAID Book has excellent information.
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cmaxx
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Posted - 2004.07.22 20:50:00 -
[14]
If you really want to know, find a copy of Garth Gibson's thesis, it's published in book form.
Also The RAID Book has excellent information.
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Qwakrz
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Posted - 2004.07.24 12:05:00 -
[15]
Another good place is storagereview.
Goto here and click on the raid section. They also have very good info on anything to do with HDD's and there development.
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Qwakrz
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Posted - 2004.07.24 12:05:00 -
[16]
Another good place is storagereview.
Goto here and click on the raid section. They also have very good info on anything to do with HDD's and there development.
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Arkaine
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Posted - 2004.07.29 04:29:00 -
[17]
If you're asking if RAID 5 works like norton ghost, this is something you REALLY dont want to get yourself into at this point.
Just my two cents.
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Arkaine
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Posted - 2004.07.29 04:29:00 -
[18]
If you're asking if RAID 5 works like norton ghost, this is something you REALLY dont want to get yourself into at this point.
Just my two cents.
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ruro
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Posted - 2004.08.02 10:55:00 -
[19]
Edited by: ruro on 02/08/2004 10:56:39
Originally by: Necronomicon
Edited by: Necronomicon on 28/06/2004 10:02:35
(BTW, letting software do this causes a HUGE cpu overhead, always use a RAID controller, they are very cheap now)
You'll find that cheap RAID cards don't have an onboard processor for parity creation etc (and thus they use the system CPU).
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ruro
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Posted - 2004.08.02 10:55:00 -
[20]
Edited by: ruro on 02/08/2004 10:56:39
Originally by: Necronomicon
Edited by: Necronomicon on 28/06/2004 10:02:35
(BTW, letting software do this causes a HUGE cpu overhead, always use a RAID controller, they are very cheap now)
You'll find that cheap RAID cards don't have an onboard processor for parity creation etc (and thus they use the system CPU).
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