[linux-lvm] Re: LVM writes on raw disk of ATA RAID Mirror
freemyer at NorcrossGroup.com
Wed Apr 30 11:40:02 UTC 2003
>> In message <20030429220328.XULC259.imf39bis.bellsouth.net at tiger2>, Greg
>> > >> Now y'all can tell me that the Promise ATA RAID cards suck and I
>> > >> shouldn't use them, and I should get a hardware RAID card, [....]
>> > >> And I'll happily agree with you, but for two small facts:
>> > >> - the hardware RAID cards cost more than twice what the drives cost,
>> > >> they're 120GB IDE drives with large caches; let alone SCSI hardware
>> > >> RAID (which also increases the cost of the disks a lot too);
>> >Just thought I would point out that a 2-channel 3ware card is about the
>> >of a single 80GB drive. (i.e. $130 US)
>> Around here (New Zealand) I can buy a 120GB IDE disk, with a 3 year
>> warrenty, and a 8MB cache, for that sort of price (NZ$280 -> US$140 ish).
>> Still, that's a lot closer to the price of the Promise cards (I'd
>> previously only seen the 3-ware cards with prices around the US$250 ish
>> sort of mark). Is that for the 3Ware 7000-2 card, which appears to be
>> a 2-drive (single IDE channel?), card as best I can tell? Or for the
>> 3Ware 7500-4LP card which appears to be a 4-drive (2 IDE channel?) card?
>> (The Promise TX2000, and most of the Promise on-board ata-raid chipsets,
>> are 2 IDE channels, 4 drives max -- although of course for best
>> performance you really only want one drive per IDE channel.)
Yes, the 7000-2, but it uses 2 IDE channels.
3ware only talks to IDE masters.
i.e. The 4 drive card uses 4 IDE channels and 4 separate cables, one per drive.
I have not yet tried the 8 and 12 port cards, but I assume they are the same.
I want to build up a 1 TB machine for testing soon, so I need to buy a 8-port card.
Not sure that I will ever need a 12 port.
>> Now all I need to find is a source of 3ware IDE cards in New Zealand;
>> I haven't found any retail sources so far, and the one distributor I
>> found mentioned doesn't even have a website in New Zealand (it redirects
>> to a flash-only overseas website).
I don't know how many you need, but I buy them from Bell Micro in OEM
packs (no cables, no manuals, no software). They come 10 to a box for
slightly less than $1000 US. $130 US is for a retail package.
You can download the manuals and software, and we did not use their cables anyway.
Maybe Bell Micro ships to New Zealand?
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