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02-03-2003 01:34 PM
02-03-2003 01:34 PM
Solved! Go to Solution.
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02-03-2003 02:57 PM
02-03-2003 02:57 PM
Re: RAID 4Si RAID controller & DS2100
For what you are describing, use standard UltraSCSI LVD cards, and use either mirrordisk/ux to do LVM mirroring across the two halves of the DS2100, or across two seperate DS2100s (for higher availability and no single point of failure). Or, on 11i, use the "light" version of Veritas Volume Manager that is included, to mirror across the two SCSI buses for free.
From your question, you seem to be approaching mirroring or RAID-5 protection from a different direction than the designers intended. What I have described is the way that most people would do RAID or mirroring, or at least much more in line with the intended use of each of these different cards.
Hope it helps. --bmr
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02-03-2003 03:02 PM
02-03-2003 03:02 PM
SolutionI seem to recall that there are issues with dual-initiating with the DS2100, however, and I'm not sure that seperatly initiating each half from one card is supported. I don't know why it wouldn't be, but I don't really think you gain anything until you actually mirror to a drive in a different chassis.
If you're just looking for cheap mirrored storage, like I said, use standard UltraSCSI LVD cards and do OS mirroring (free, on 11i, if you use the VVM "lite" product).
--bmr
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02-03-2003 07:08 PM
02-03-2003 07:08 PM
Re: RAID 4Si RAID controller & DS2100
In either case, RAID4Si cards can only have one connection to a given SCSI bus, because all channels of the card use SCSI ID 7. If you use a DS2300 (or an SC10) in split bus mode, you can connect two channels of the RAID 4Si to the JBOD, and mirror disks from one side to the other.
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02-04-2003 12:19 AM
02-04-2003 12:19 AM
Re: RAID 4Si RAID controller & DS2100
The ds2100 is a JBOD, and has only 1 controller, so no split-bus/full-bus modes exist (if you want, it is always in full-bus mode).
The best way for HA is to connect the ds2100s on 2 separate channels on 1 4Si. You can also daisy-chain the ds2100 and connect them to 1 channel, treating 8 disks on 1 single channel instead of 4 disks per channel. But that is no good for HA.
HTH,
Vince
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02-04-2003 06:26 AM
02-04-2003 06:26 AM
Re: RAID 4Si RAID controller & DS2100
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02-04-2003 08:10 AM
02-04-2003 08:10 AM
Re: RAID 4Si RAID controller & DS2100
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02-04-2003 09:48 AM
02-04-2003 09:48 AM
Re: RAID 4Si RAID controller & DS2100
You could not expand this configuration to have 2 DS2100's on each channel and do the same RAID 1 configuration -- you'd have to look into using RAID 1+0 for something like that.
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02-05-2003 12:39 PM
02-05-2003 12:39 PM
Re: RAID 4Si RAID controller & DS2100
In this way, the 8 LUN limitation doesn't impact you as bad, and you could actually run two DS2100s on each channel before you ran out of LUNs. This is actually quite a bit of storage.
You need at least three drives to do raid-5 (ideally in three different DS2100s, so if you don't need all this space and all these LUNs, just go with mirrored (raid 0/1) across a pair of chassis on two channels.
One note of caution: this is your cheapest raid protection, but it has these drawbacks:
1> Single point(s) of failure (the 4Si raid controller itself)
2> Performance: if you put a lot of storage behind one overworked controller, and try to drive a lot of I/O, it will be slow.
For not too much money, you can see how this works for you, but if you end up needing no single point of failure HA, or lots more performance, you'll want a VA7410 array, or the current king in the small space (this week), the EMC CX600.
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