Converting Storedge 3310 RAID unit to act as JBOD?
Hello, I have been struggling with this configuration, any advice is appreciated.
I have 4 x Storedge 3310 RAID units each with it own controller. I have 1 x Linux host and 1 x HBA in the host, with ch0 and ch1. I want to be able access to all 4 Storedge 3310s. Normally if this were 2 x Storedge 3310 RAID + 2 x JBOD then I just connect each RAID unit to a JBOD then each RAID to ch0 and ch1 respectively to the host. Instead what I have is 4 x Storedge 3310 RAID units, is there a way to convert two of the Storedge 3310 unit to make it act exactly like a JBOD? So that I can daisy-chain them to make them all accessible to the host?
Or adding another HBA card to the host is the only option?
thank you.
[730 byte] By [
sysbota] at [2007-11-26 12:21:40]
# 1
Not 100% sure, but looking at the system handbook there are two distinct part numbers for the RAID backplane versus the JBOD backplane, which implies a difference between the two units that would prevent getting JBOD IO modules to convert the chassis.
# 2
I haven't though about trying that but that's a good point, can a RAID unit be physically converted to JBOD? I know that JBOD can be converted to RAID unit with modular RAID controller but haven't seen anything vice versa.
My question was more concerning with remapping the channels in the RAID units so that two RAID units sitting on a host channel will look like it's on a single backplane, each is accessible by by the host by its ID, so the question is can 1 host channel act as a backplane so that it can see two RAID units?
But i'll take any advice on how to make this work.
thanks,
# 3
I haven't though about trying that but that's a good point, can a RAID unit be physically converted to JBOD? I know that JBOD can be converted to RAID unit with modular RAID controller but haven't seen anything vice versa.
My question was more concerning with remapping the channels in the RAID units so that two RAID units sitting on a host channel will look like it's on a single backplane, each is accessible by by the host by its ID, so the question is can 1 host channel act as a backplane so that it can see two RAID units?
But i'll take any advice on how to make this work.
thanks,
# 4
I don't have a 3310 to test, but you should be able to change target ID's on the host channels, which would allow them to appear on the same bus. On the menu it would be under the host channel and host lun sections.
# 5
What is the difference between the host/drive channel? Besides the fact that they are their for connecting to disk drive or to host. Because lets say I connect the first RAID controller to the second one, host-to-host configuration from one RAID to another, will the host see this transparently?
By the way, I tried the JBOD method you mention so basically just connect one of the RAID unit to the other one just as a JBOD and the RAID controller can see the disks on a difference channel but only half of the disk because the RAID I/O actually have internal conneciton to half of the disk, while the other half is jumper.
