Re: [Ltsp-discuss] Raid 1 or Raid 5? New server advice.

[Mgr. Peter Tuharsky]

Peter, as of RAID, it completely depends on the controller. The "less expensive" controllers only support RAID 0, 1 and possibly 10. Only the "more expensive" controllers can handle RAID5 because of much more complicated logic, data checksumming etc.. I  can only speak about Adaptec SCSI controllers since we have 3 of these, but the RAID5 capable controller costs at least $500. I have checked the pricelist, and if I compare Seagate SCSI drives, 2x146GB costs cca 40% more than 3x73GB! With Fujitsu drives, it is 60% more! I wonder, if Your calculations are right.     Sincerely Peter Hieromonk Peter  wrote / napísal(a): Let me clarify about the increasing capacity. 146 GB should be more than enough for our needs for the foreseeable future. I priced a system with this capacity for a Raid 1 using two 146 GB drives, and systems with 3 x 73 GB and 5 x 36 GB drives using Raid 5. Both of the Raid 5 configurations cost more than the Raid 1, I presume because the cost savings of the smaller drives was not enough to offset the cost of the extra drive I would have to have with Raid 5. If down the line I wanted to increase our storage capacity, I was wondering if I could add a third 146 GB drive and make it a Raid 5. My big question was whether the same Raid controller could do either Raid 1 or 5. I kind of assumed I would have to rebuild the entire system to do this, which you verified with your email. So that is what I meant. I hope it makes sense? Thank you very much for your reponse. It's been a big learning experience for me, and I appreciate the help. With kind regards, Peter, hieromonk ----- Original Message ----- From: "Michael George" <[EMAIL PROTECTED]> To: "Hieromonk Peter" <[EMAIL PROTECTED]> Cc: <ltsp-discuss@lists.sourceforge.net> Sent: Friday, August 11, 2006 8:23 PM Subject: Re: [Ltsp-discuss] Raid 1 or Raid 5? New server advice. Hieromonk Peter wrote: Thank you all very much for your help, advice and information. I appreciate it very, very much. I've read more about Raid in the past few days than I ever wanted to, []:-) and I think I am still leaning towards sticking with a Raid 1. 146 GB should be plenty of space for us for quite some time, so it doesn't make sense to go with a Raid 5. A Raid 5 costs more, and would only really benefit us if we were ever needed to increase our storage capacity. I am not sure what you mean there about a benefit only if you needed to increase capacity... Even if you have a RAID 5 Array on a 3Ware card, you cannot just add drives to it. You would have to remove and rebuild an array (see below). To add capacity to a system without moving the data off of and back onto the drives, you would need something like the Linus Volume Manager, which can use RAID as its underlying storage if you would like... ---- Which leads to another question: If I have a Raid controller set up to handle the drives as a Raid 1, can I later use the same controller and have it handle the drives as a Raid 5? It would be fine with me if I had to rebuild the system to do this. Just curious of what my options are with that in the future. It seems to me that it should, because it is the same controller Dell sells for both configurations. If you use a 3Ware card with >2 drive interfaces, you can make it a RAID 1 or RAID 5. You can change it later, but that will wipe out all your data. So, if you use the same controller, you will need to reliably move all the data to another medium, remove the array, and rebuild it as a RAID 5. -- -Michael George Ideal Solutions, LLC ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net

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Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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