Hi, 2010/9/9 Etzion Bar-Noy <eza...@tournament.org.il>
> This is a joke, right? You want someone to host your system, which, by > design, will not be rack-mountable, and would be large, due to the amount of > disks you are to place there. It is possible, but extremely expensive to > host a non-1-U server nowadays. Who would "give" it to you? Huh? Of course it will be rack-mountable. I'm planning to put it on a 2U or 3U chassis. I'm also not looking for someone to host my hardware, I already got a rack in Netvision today. > An industrial-grade, 2U system could host, today, about 6 3.5" SATA disks. > A 3 U can do much more, with up to 12-14 disks, depending on the system. > IBM EXP 3000 can host 12 3.5" hard drives on a 2U chassis. See this<ftp://public.dhe.ibm.com/common/ssi/ecm/en/tsd03025usen/TSD03025USEN.PDF>PDF file. There are other 2U cases which can host 12 3.5" disks. And RAM is extremely important. Since you will not invest in an > industial-class RAID controller (3ware, LSI-Logic, Adaptec, Intel, etc) > which will cost several hundreds of dollars, as I see it, you would want to > compensate for the high write latency with a large amount of RAM and fully > buffered writes (not secure, but good enough). Especially with 7200RPM SATA > drives with low seek speed. > NFS shares, in "async" mode would give great performance, provided you give > the system enough RAM. Then your RAM will actually become the disk write > cache. > Since this machine will not be using any Xeon with it's expensive RAM, I could put some gigs of RAM quite easily. Thanks for your points. Hetz > > Ez > > 2010/9/9 Hetz Ben Hamo <het...@gmail.com> > >> Hi, >> >> >> 2010/9/9 geoffrey mendelson <geoffreymendel...@gmail.com> >> >> >>> On Sep 9, 2010, at 6:35 PM, Hetz Ben Hamo wrote: >>> >>> >>>> I'm planning to add some big storage solution to my VPS business. I did >>>> some checking and calculated the costs, and figured out that if I want to >>>> have a decent 12TB solution NAS box, it would be best if I would roll my >>>> own. (12 TB before all the RAID stuff, after that it would lot less). All >>>> other solutions are very expensive (example: IBM EXP 3000 costs here 6K nis >>>> without a single hard disk). >>>> >>>> >>> The question you should be asking yourself, IMHO, is what can I buy that >>> will be as reliable as a commerical, "industrial grade" server? >> >> >> Not looking for industrial grade one. >> >>> >>> I'm planning to use hardware based RAID card, minimal Linux distribution >>>> and have some offers like iSCSI, NFS, CIFS - the usual suspects. >>>> >>>> My question is: since I'll use hardware RAID card, which processor and >>>> how much RAM should I put in such a machine? Xeon is overkill IIRC. >>>> >>> >>> For example, a system which costs under 900 NIS would do the job. You can >>> get them from Ivory or KSP. They have a dual core ATOM processor, >>> one PCI slot and one DDR2 memory slot. The power supply is not very big, >>> but it will power a bunch of 5400 rpm "green" disks. >>> >> >> >> This storage will be mainly used for backups. If someone wants to do a >> colocation to my rack, I want to give him a bonus, something that you can't >> find today with my competitors: I want to give him 50-100GB for storage. >> You'll get an NFS/CIFS/iSCSI and you mount it to your machine and use it for >> your backup/rsync/whatever. By comparison, when you colocate a server to >> Netvision's farm, you get ... 5GB backup space.. yippee.. >> >> >>> How well will it work? How long will it last? Will it be fast enough? >>> >> >> "Fast" doesn't matter much when you're doing backups or storing some >> temporary stuff, does it really matter when it take 20 seconds instead of 10 >> when you're doing rsync? I don't think so.. >> >> >>> And the "killer" question, how much will it cost to replace, in the value >>> of downtime, your time to replace it, bad will among your customers, etc? >>> >> >> Really depends. I'm not planning to fully use all the disks, some will be >> disconnected or out of the RAID, perhaps I'll put a redundant PSU. >> >> Hetz >> >> >>> Geoff. >>> >>> -- >>> Geoffrey S. Mendelson, N3OWJ/4X1GM >>> To help restaurants, as part of the "stimulus package", everyone must >>> order dessert. As part of the socialized health plan, you are forbidden to >>> eat it. :-) >>> >>> >>> >>> >>> >>> >>> >>> >> >> -- >> my blog (hebrew): http://benhamo.org >> Skype: heunique >> MSN: hetz-b...@benhamo.org >> >> _______________________________________________ >> Linux-il mailing list >> Linux-il@cs.huji.ac.il >> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >> >> > -- my blog (hebrew): http://benhamo.org Skype: heunique MSN: hetz-b...@benhamo.org
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