RAID 0 in X99 a

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azadjannati

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Sep 4, 2013
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Hi everybody
I tried to make a RAID with these Modules I have ,
ssd corsair 240 G
2* 1T western HDD
Motherboard : X99
I RAID all of them RAID 0 , but all of it shows 670 G instead of 2.6 T
and after that , when installing Windows 7 it says unable to create a new system partition or locate an existing system partition..
Sorry to ask this but I am new in RAID ,
thank you so much to guide me what should i do?
 
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Should be no problem. You can do it either through hardware (through the Intel Chipset on the motherboard), or through software (disk management which is a software based RAID built into windows).

Probably the easiest way is the software raid. Link here for 'how to'.

http://www.howtogeek.com/howto/36504/how-to-create-a-software-raid-array-in-windows-7/

Some notes. If I'm not mistaken, 'spanned' is the equivalent of JBOD. It has no striping to improve performance, and no redundancy. It just fuses all the drives into a single big blob of storage. 'striped' is RAID0 (performance, no...
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Rookie_MIB

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RAID 0 is striping, which spreads writes out across all drives and increases speeds with no redundancy. The way that works is that if the drives are all different sizes, it takes the SMALLEST of the three drives, creates the same partitions on all three drives, and tosses any extraneous space on the larger drives.

Thus, you have three drives, the smallest is 240GB, so it will use 240GB each on the other two drives, then stripe them for a total space of 3 x 240 = 720GB, or, as you see, 670GB usable, and you're wasting 1.3TB as 'dead space'.

You're better off getting matching drives when creating RAID sets, that eliminates wasted space.

Best thing to do? Leave the SSD as a single drive. Tests have shown that RAIDed SSDs don't really have much of a benefit. Then if you want you can RAID 0 the two WD 1TB drives, that would give you 2TB of space.

For reference:

RAID 0 - stripe. Splits the reads/writes to different drives to utilize both channels. Combines both (or more) drives into a single array. Has no redundancy. If a drive fails, all data is gone.

RAID 1 - mirror. Duplicates reads/writes to different drives to utilize both channels and provides redundancy. Writes are same speed, reads however can increase as it can utilize both channels (read part from d1, other part from d2). Provides redundancy, if a drive fails, the other drive is readable and data is safe until a replacement drive can be installed and data copied over.

RAID 5/6 - stripe with parity. Spreads data across multiple drives including a parity check. Requires 3 drive minimum. Writing data is a bit slower, as the parity (for integrity) has to be calculated, then extra data is written. Read speed is increased, as data can be read through multiple channels. RAID 5 can survive 1 drive failure, RAID 6 has an extra parity calculation (requires min 4 drives) and can survive two simultaneous failures.

RAID 10 (stripe of mirrors or mirrored stripes). Combines a minimum of 4 drives, imagine taking a RAID 0, then combining it with another pair of drives to create a mirror of that RAID 0. Hence, RAID 10. Can survive two drive failures. Increases speed of reading, writing has extra data to be written so no increase there.
 
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azadjannati

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Thank you so much to explain in details , is it possible to RAID two HHD with 1T the same size and stay SSD with different size in AHCI ?


 
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Rookie_MIB

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Should be no problem. You can do it either through hardware (through the Intel Chipset on the motherboard), or through software (disk management which is a software based RAID built into windows).

Probably the easiest way is the software raid. Link here for 'how to'.

http://www.howtogeek.com/howto/36504/how-to-create-a-software-raid-array-in-windows-7/

Some notes. If I'm not mistaken, 'spanned' is the equivalent of JBOD. It has no striping to improve performance, and no redundancy. It just fuses all the drives into a single big blob of storage. 'striped' is RAID0 (performance, no redundancy), 'mirrored' RAID1 (read performance and redundancy). If you're running WIn 8/10 - you have 'parity' - equivalent to RAID5. Win 7 has no RAID5 option (which sucks balls).
 
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