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Multiple SCSI Raid Arrays on same channel?

post #1 of 3
Thread Starter 
Been considering purchasing 2 of the new Maxtor Atlas 146gb 15kII SCSI drives for another raid array. I want to have windows booting off my 2 36gb 15k drives in raid-1 and have the new drives operate in raid-0. I want this new raid-0 array to work on the same channel as the raid-1 array. Problem is I am not 100% sure if I can have 2 different raid arrays sharing a single U320 SCSI channel. I was hoping someone could tell me for sure if I can do this before I run out and purchase these drives.

Is it possible for 2 raid arrays to operate on the same U320 channel? How about 1 array + multiple single volumes?
post #2 of 3
No, you would have to run it on a seperate channel. There is no possible way to run two different RAID arrays on the same line.
    
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post #3 of 3
Thread Starter 
Actually I found out from adaptec that I can. I found this surprising since I was assuming I couldn't, and that I couldn't put additional single volumes on the channel outside of the array. Great to know I can run 2 small arrays (or one large) per channel and have additional single volumes. Great PCI-X SCSI card this Adaptec 29320LP-R is turning out to be. Time to throw out my Raptor 150gb drive

I will post what adaptec sent me below.

Question:
Is there any limit as to the number of drives allowed on each channel under HostRAID setup for RAID 0, 1 or RAID 10?
Is there any limit as to the size of an RAID array under HostRAID?

This information applies to the following Product(s):
- This information is not Operating System specific
- Adaptec SCSI Card 29320A-R
- Adaptec SCSI Card 29320ALP-R
- Adaptec SCSI Card 39320A-R
- Adaptec SCSI Card 29320-R
- Adaptec SCSI Card 29320LP-R
- Adaptec SCSI Card 39320-R
- Adaptec SCSI Card 39320D-R
- Adaptec Serial Attached SCSI 44300
- Adaptec Serial Attached SCSI 48300
- Adaptec Serial Attached SCSI 58300


Answer:
There is a limit to the number of drives that can be used for HostRAID setup as well as for the size of an array. The total size of an array cannot exceed 2TB (two terrabytes). The maximum number of drives in arrays per channel is 4. All the drives included in the array must be on the same channel.

Choose “only one” of the following per channel:

A.) One RAID 0 with 2 or 3 or 4 drives.
B.) Two RAID 0s with 2 drives each.
C.) One RAID 0 with 2 drives and one RAID 1.
D.) Two RAID 1s with 2 global spare drives.
E.) One RAID 10 with 2 global spare drives.

RAID 1 is build with two drives always.

Under non-HostRAID setup, you can have up to:
- 15 SCSI devices per channel on the Ultra320 SCSI Cards
- 4 direct attached SAS/SATA drives on the Adaptec Serial Attached SCSI 44300 if no expander is used.
- 8 direct attached SAS/SATA drives on the Adaptec Serial Attached SCSI 48300 and 58300 if no expander is used.

Note 1: Additional drives not being setup for RAID will appear as single volumes.
Note 2: RAID 10 is a supported feature set on the Adaptec SCSI Cards 29320-R, 29320LP-R, 39320-R, 39320D-R with BIOS revision 4.30.0 or later.
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