I don't think this is off topic since I want to use JBOD mode so that Linux can do the RAID. I'm going to hopefully run this in CentOS 5 and Ubuntu 12.04 on a Sunfire x2250
Hard to get answers I can trust out of vendors :-)
I have a Sun RAID card which I am pretty sure is LSI OEM. It is a 3G/s SAS1 with 2 external connectors like the one on the right here :
http://www.cablesondemand.com/images/products/CS-SAS1MUKBCM.jpg
And I have 2 x Sun J4400 JBOD cabinets each with 24 disks.
If I buy a new card that is 6G/s SAS2 with the same connector, can I connect my cabinets to it and have them work? Even if they only work at 3G/s I don't care.
I've also hit an issue with the number of logical devices allowed, and am wondering whether this might be a HW, FW or SW limitation if anyone knows.
I want to run everything in JBOD mode and let Linux do the RAID. So for the first cabinet I ran this command 24 times to create a logical drive for each physical one
/usr/StorMan/arcconf create 1 logicaldrive max volume 0,X noprompt
Where X goes from 0 to 23
Went great, created /dev/sd[c-z] and I was able to use those with mdadm to create 4 x RAID6 arrays and then a big RAID0 out of the 4 x RAID6. Works great!
Then I try to connect the 2nd cabinet and when I run the above arcconf command it tells me there are already 24 logical devices, and this is the max.
Anyone know whether that is HW, FW or SW?
Would a new card fix this problem? Anyone know for sure of a card with above connectors that has a JBOD mode that will support 48 drives and expose them all to Linux?