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#1
October 27th 03, 02:08 PM
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Intel or PowerPC for RAID controller
Dear ALL
Please discuss pro & conts on using Intel vs PowerPC based RAID controlers ... (e.g. some vendors use PPC750 and some use IOP303 or newer) ... Other query: while Intel ships newer IO Procesors (recently IOP321 and IOP331) many vendors of raid array still use IO303 outdated processor (& chipset) and even i960 ... Why? Please comment: performance, reliability, applicability etc ... Thanks for your time! Cheers, AL 
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#2
October 27th 03, 05:30 PM
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#3
October 28th 03, 10:35 AM
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Anton Rang wrote in message ...
(albatros66) writes: Please discuss pro & conts on using Intel vs PowerPC based RAID controlers ... (e.g. some vendors use PPC750 and some use IOP303 or newer) ... Cost, form factor, familiarity of developers, features; take your pick. To take or not to take, that's the question ;-) * Cost are not much different: varying from 12000 USD to 18000USD for 4TB subsystem ... * familiarity of developers: I'm not developer. I'm "end user" ( not a user at gray end 8-}). I don't need to care about * features - most of the subsystem have almoust the same features - the lists of features are long or very long: ten or more RAID modes, flashilg lamps, SNMP, hot everything etc etc ... Let's take your pick again: which SCSI/FIBRE-to-IDE/SATA array is best from any point of view ??? Is anybody brave enough to answer the question??? I have to answer to my boss because whe are just buying few such devices (some 20TB) ... AL
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#4
October 30th 03, 07:10 AM
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"albatros66" wrote in message m... * Cost are not much different: varying from 12000 USD to 18000USD for 4TB subsystem ... * familiarity of developers: I'm not developer. I'm "end user" ( not a user at gray end 8-}). I don't need to care about * features - most of the subsystem have almoust the same features - the lists of features are long or very long: ten or more RAID modes, flashilg lamps, SNMP, hot everything etc etc ... Let's take your pick again: which SCSI/FIBRE-to-IDE/SATA array is best from any point of view ??? Is anybody brave enough to answer the question??? I have to answer to my boss because whe are just buying few such devices (some 20TB) ... Can you give any info on what applications you are going to be using the storage for ? It's usually a big factor in choosing the right system. I'm guessing you are looking at something to maybe do archiving if you're looking at IDE based storage ? What do you mean by "familiarity of developers" ? Good to see you're after "flashing lights" as a buying factor ;-) Not enough manufacturers are aware of this ... though Ciprico had a great "Meg-O-Meter" on theirs :-) One company I have a lot of respect for is DigiData (http://www.digidata.com) they're not to huge so they have the time and inclination to talk to you and help sort out any questions/problems you may have and the RAID controllers they've made in the past have always been horribly quick. Regards Mark
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#5
October 27th 03, 08:42 PM
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#6
October 27th 03, 09:33 PM
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Benjamin Goldsteen wrote:
Other query: while Intel ships newer IO Procesors (recently IOP321 and IOP331) many vendors of raid array still use IO303 outdated processor (& chipset) and even i960 ... Why? In summary, the key issues are quality of hardware and software. If you can find two boxes that don't loose your data, then you might worry about performance. Also look at what happens at power loss. A 512 MB write-back cache with no battery backup (AXUS why can't you deliver that battery backup option mentioned on your website?) will surely mean data loss if the power goes out. Thomas
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#8
October 28th 03, 07:34 PM
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albatros66 wrote:
* Do you think, that internal bus with frequency e.g. 33MHz (or 66MHz) is OK? The newer chips use 133MHz bus (or more ). Note that with enclosure containing 16 SATA drives it becomes feasible to get trasfer rates upt to 300Mbytes/s or more (I know about boxes with RAID5 rates: 200MBytes/s write and 300MBytes/s read) * newer chipsets have the appropriate asic on board which works much faster * newer chipsets suport more cache memory and aslo offer cache memory battery backup ... Well, at least one vendor offers battery backup (which you want) but cannot deliver it. Then, the device I tried gave a satisfactory (for my purpose) performance of about 70 megabytes/sec over SCSI, in RAID 5. Nothing to write home about. The drives could handle this at 33 MB/sec interface rate, but I think the manufacturer claims 133 per drive. Useless, I'd guess. It is the Axus Brownie. Thomas
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#9
October 28th 03, 10:23 PM
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#10
October 30th 03, 04:07 AM
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On Tue, 28 Oct 2003 14:23:18 -0800, Malcolm Weir
wrote: So what? I'd certainly *hope* that the embedded CPU isn't touching the data at all... Actually most of the systems use the CPU for parity calcs * newer chipsets have the appropriate asic on board which works much faster What "appropriate asic"? Works much faster than *what*? The LSI controller (also used by StorageTek's Bladestore ATA offering) uses a dedicated ASIC for this, freeing up the CPU to only do traffic control and config. Scott
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