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FreeBSD RaidDisclaimer: This is very old information kept here for archival purposes. More current information can certainly be found elsewhere on this site or others. When trying to setup a RAID subsystem for one of the servers at a company I work for, I had to do a lot of research on exactly which RAID controllers do and don't work. This is a summary of what I found by digging through the mailing lists, reading vendors notes, and so on. Hopefully others will find this usefull. I obviously haven't actually tried all of these devices, so this is mostly based on info I've gleaned from elsewhere and I can't guarantee the accuracy of it. If you notice anything on this page being out of date or wrong inform old address removed.
Notes on Prices: Network Buyers Guide List of SCSI Raid controllers. CAVEATS This is for CMD and Infortrend SCSI-SCSI systems: One caveat is that if you use the Adaptec 2940/3940 card, disable "allow disconnects." The only FreeBSD issue you need to be aware of is that if you do decide to use partitions, you need to make a little change to the kernel to enable multiple LUN probing. This is because FreeBSD views partitions as being on separate LUNs. See http://www.freebsd.org/handbook/handbook122.html#257 for more details on enabling multiple LUN probing. FYI, I didn't add the struct as suggested in the handbook. I just changed the line in /sys/scsi/scsiconf.c: maybe_more = 0; /* by default only check 1 lun */ to this: maybe_more = 1; /* by default check all luns (time for a coffee break!) */ Stuff I haven't catagorized yet... Yes, we're using RAID solutions in production systems. We build scalable telecom systems, e.g. voice/fax-mailbox systems. I think the hardware we're using are DTC SCSI RAID controllers. They handle up to 7 scsidisks, RAID 0-5, I think. Hotswapping, and I think they could connect to two hosts as well. And they have a serialport, so you could control it using a VT-100 terminal, as well as using the display and buttons on the front for setting up the controller. Oh yeah, it has an audiable alarm :) I've no idea about the prize anyway. But it's good stuff. CMD Technology Inc. (http://www.cmd.com/) also makes SCSI-to-SCSI RAID controllers. They also have a turnkey system, the Daytona, which includes a RAID controller and a drive enclosure with redundant power supplies, hot-swappable drive canisters, and an extra slot for a tape drive. The CMD CRD-5500 RAID controller is their top of the line product. It supports RAID levels 0, 1, 1+0, 4, and 5, and comes standard with 16MB cache RAM (expandable to 512MB with 72-pin SIMMs). It comes in the standard 5.25" full-height form factor, so you can put it into any standard case which has full-height bays. This beast has 9 slots, in which you can put the following SCSI interface modules: CRD-5530 10MB/s single-ended FAST/SCSI-2 (disk channel only), $395 CRD-5540 20MB/s single-ended FAST/WIDE SCSI-2 (disk/host channel), $495 CRD-5560 20MB/s differential FAST/WIDE SCSI-2 (disk/host channel), $595 **All prices are list prices The CRD-5500 by itself (no modules) lists for $3,525. The CRD-5500 controller supports any combination of interface modules, with a maximum of 4 host channels and a maximum of 8 disk channels. Yes, this means that this one RAID controller can be connected to multiple FreeBSD machines. I'm not exactly sure what the limitations are with this, though. CRD-550-015 CRD-5500 with 1 single-ended FAST/WIDE SCSI-2 host module and 5 FAST SCSI-2 The CRD-5500 can also be hooked up to another CRD-5500 using the Failover kit (P/N: AAK-005500-000) for redundancy. The Daytona contains a CMD CRD-5300 RAID controller and an enclosure with support for either 4 3.5" half-height disks or 6 3.5" low profile disks. It comes with 16M cache, and has hot swappable redundant fans and power supplies. The following is a table of model numbers and list prices for the Daytona: HWS-005931-141 4 3.5" half-height canisters, single-ended FAST SCSI-2 list $5,995 HWS-005931-161 6 3.5" low profile canisters, single-ended FAST SCSI-2 list $5,995 HWS-005931-241 4 3.5" half-height canisters, single-ended FAST/WIDE SCSI-2 list $6,118 HWS-005931-261 6 3.5" low profile canisters, single-ended FAST/WIDE SCSI-2 list $6,118 HWS-005932-141 4 3.5" half-height canisters, differential FAST SCSI-2 list $6,395 HWS-005932-161 6 3.5" low profile canisters, differential FAST SCSI-2 list $6,395 HWS-005932-241 4 3.5" half-height canisters, differential FAST/WIDE SCSI-2 list $6,518 HWS-005932-261 6 3.5" low profile canisters, differential FAST/WIDE SCSI-2 list $6,518 ** All Daytonas have 1 host port and 2 SCSI channels, and are expandable to 128M of cache There will supposedly be a slave drive box (to be available soon) so you can attach more drives to the Daytona. No word on when that might be available, though. As for availability, CMD recently announced that it is distributing the Daytona through Tech Data (large distributor), so it shouldn't be *that* hard to find. I apologize for the lengthy message, but some of this info isn't on their web site (I had to get them to fax it to me). This is your day. I'm giving the following a spin. I'm not much into C, but I think I got all the fields right: > /* Added to fix CRD-5440's lack of tags */ > { T_DIRECT, SIP_MEDIA_FIXED, "CMD TECH", "CRD-5440*", "*"}, > /*quirks*/0, /*mintags*/22, /*maxtags*/30 > }, > { Oh, I should have been a little more clear there. Go into sys/cam/cam_xpt.c, and look around near the top of the file. You'll see a quirk table with entries like this: { /* Reports QUEUE FULL for temporary resource shortages */ { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP39100*", "*" }, /*quirks*/0, /*mintags*/24, /*maxtags*/32 }, And, as far as numbers go, I'd suggest that you use exactly the numbers that we use for the Atlas II, above. They'll apply to both luns of your RAID controller, so the available tag openings will be evenly split between the two. Adjile????? http://www.caeneng.com/ http://www1.asacomputers.com/ http://www.dejanews.com/=zzz_maf/dnquery.xp?search=thread&svcclass=dnserver&recnum=%3cXFMail.981026204544.shimon_simon-shapiro.org@ns.sol.net%3e%231/1 CMD - 64 (32 per channel/total? I'm getting conflicting data here - check) tagged commands[CMD has some problems due to this], Mylex 128 tagged commands, the Infortrend has 1024 (wow) tagged commands in current firmware. Kingston DS400 RM - $572 wholesale DE100I-SWD/B Carrier - $175 wholesale DX100-SW/H Hot Swap option $53 STUFF I CAN'T GET/HAVEN'T GOTTEN ANY INFO ON YET. => The Symbios SCSI<>SCSI raid systems we have at work have ethernet StorComp RAID-7 |
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