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In place upgrade of RAID1 to RAID5 - Page 3

post #21 of 32
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Quote:
Originally Posted by levontraut View Post
this...

and also how did you get them to raid..... all my mobos never wanted to set them up as raid.........
I dunno what you guys are talking about... I have 2 WD Green drives in a RAID1 array plugged into my mobo right now. They've been running without any problems whatsoever for the last 2 months. I've never experienced any drive dropout or errors.
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post #22 of 32
I didn't have to buy it, but if I did....

Handful of these

http://www.newegg.com/Product/Produc...82E16822332062

With the raid card

http://www.provantage.com/hewlett-pa...1~7HPP93LC.htm
Edited by rpm666 - 4/16/11 at 10:26am
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post #23 of 32
Quote:
Originally Posted by rpm666 View Post
In the 4 bay storage box I have 3 250's in RAID 5 Striped, and a single 1TB for additional non critical. Eventually I will put 4x 2TB drives in it, but I have not had the need just yet. The eSata port will be able to transfer as fast as the disks can read/write - I see absolutely no performance issues with it (for the price).

CHEAP RAID 5 (3x250GB 7200 RPM eSata)



Expensive RAID 5

Why are we takling about read when the biggest difference in a dedicated raid card and an on-board raid5 solution is the write speed?

With my current setup I get:

HP SA p410 controller (512mb BBWC) - 4x 2tb Seagate Green (5900rpm)

Sequential read: 150 mb/s
Sequential write: 130mb/s

My old setup:

nVidia nForce 8300 controller (on-board) - 4x 2tb Seagate Green (5900rpm)

Sequential read: 90 mb/s
Sequential write: 30mb/s

Both in raid5 for a 6tb effective array.
post #24 of 32
Because I just downloaded HDTune, opened it, and clicked start.

My bad?

....and I don't think I'll be doing any write tests lol


Edited by rpm666 - 4/16/11 at 9:52am
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post #25 of 32
Quote:
Originally Posted by shinigamibob View Post
I dunno what you guys are talking about... I have 2 WD Green drives in a RAID1 array plugged into my mobo right now. They've been running without any problems whatsoever for the last 2 months. I've never experienced any drive dropout or errors.
PLS CHECK AND MAKE SURE THAY ARE RUNNING AT RAID 1.....


IF THE ONE DISK DROPPS oops caps... the araid will continue running... so pls check...

i do not hitnk you are running raid one with the greens at all and if you are.... you have a golden batch and would like to know what batch you are running pls...
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post #26 of 32
Quote:
Originally Posted by rpm666 View Post
Because I just downloaded HDTune, opened it, and clicked start.

My bad?

....and I don't think I'll be doing any write tests lol

Yes, write testing is only possible on a non-partitioned drive with HDTune.

But yeah, it is important to know what will the OP use the array for. As mentioned, raid5 does not like writing on the array if you are running it from a on-board raid controller because of parity calculation being performed by the CPU.

While you will see percentual increase in read speeds switcing to a dedicated card, the increase in write speeds will be in multitudes of what it was.
post #27 of 32
Tomaskir, 4x 2TB's in RAID 5 should show a 8TB drive - Do you have it setup as a single disk parity for 6TB effective?
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post #28 of 32
Quote:
Originally Posted by rpm666 View Post
Tomaskir, 4x 2TB's in RAID 5 should show a 8TB drive - Do you have it setup as a single disk parity for 6TB effective?
Nope, in raid5 parity is distributed across all drives in the fallowing way:



Therefore, no matter what you do, in raid5 the final capacity of the array is always n-1. You can not assign a single drive as a parity disk.
post #29 of 32
My understanding was single disk parity = loss of one drive, and single point of failure.
While striped parity allows no disk loss and no individual points of failure.

Edit:No sleep = mixing RAID4 and 5.
Edited by rpm666 - 4/16/11 at 10:28am
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post #30 of 32
Quote:
Originally Posted by rpm666 View Post
My understanding was single disk parity = loss of one drive, and single point of failure.
While striped parity allows no disk loss and no individual points of failure.
I do not understand what you are trying to say, sry man

But instead of typing 2 pages worth of explanation, in all good spirits, go read up on raid5 and parity distribution and data recovery from parity blocks. (not flaming or trolling, just that I dont feel like typing a whole lot) Saves me the typing
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