Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Therese Trudeau wrote: You can turn on write back caching if you have a UPS as well (provided your UPS is wired into your system for a graceful shutdown) Hopefully you have a redundant PS unit. Having a UPS is not going to help if your PS fails. That's a very good point never thought of that. Acrtually this RAID 1 setup I'm planning is for my desktop machine, problem is is's not built like a server so there is not the traditional slid in bay for a second PS as do many 1 and 2u rack servers have. Unless there is some specialty product available that somehow fits in to a tower case. Could you reccomend a redundant PS for a desktop machine (if they exist)? The whole system needs to be designed for dual supplies. You can't just plop down two power supplies in parallel without some circuitry that attempts to monitor balance them out. I'm curious - why does your desktop needs so much redundancy ? -- Toby Bluhm Alltech Medical Systems America, Inc. 30825 Aurora Road Suite 100 Solon Ohio 44139 440-424-2240 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Toby Bluhm wrote: Therese Trudeau wrote: You can turn on write back caching if you have a UPS as well (provided your UPS is wired into your system for a graceful shutdown) Hopefully you have a redundant PS unit. Having a UPS is not going to help if your PS fails. That's a very good point never thought of that. Acrtually this RAID 1 setup I'm planning is for my desktop machine, problem is is's not built like a server so there is not the traditional slid in bay for a second PS as do many 1 and 2u rack servers have. Unless there is some specialty product available that somehow fits in to a tower case. Could you reccomend a redundant PS for a desktop machine (if they exist)? The whole system needs to be designed for dual supplies. You can't just plop down two power supplies in parallel without some circuitry that attempts to monitor balance them out. I'm curious - why does your desktop needs so much redundancy ? Just for fun, the first hit on a google for redundant atx power supply http://www.directron.com/tc400r8.html Seems you can just plop one into your std atx chassis . . . -- Toby Bluhm Alltech Medical Systems America, Inc. 30825 Aurora Road Suite 100 Solon Ohio 44139 440-424-2240 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Just for fun, the first hit on a google for redundant atx power supply http://www.directron.com/tc400r8.html Seems you can just plop one into your std atx chassis . . . i have never understood how something with a single feed can be termed 'redundant' ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Yeah, that PS appears to have only one outlet (unless i'm not seeing it in the photo), most redundant PS's have seperaate outlets for a Y power cable one for each supply. Guess it's not that redundant. yes - although i would never use a Y cable - Dual PSU's need 2 feeds from seperate PDU's ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Therese Trudeau wrote: Date: Fri, 14 Mar 2008 10:33:29 -0400 ACTUALLY I totally forgot. I absoluteluy can not use software raid. Because I use Adobe products. Adobe products do not install well on software raid systems, and tend to crash on software raid beacuse of their activation process. If I go raid, I absolutely need a hardware raid which is entirely transparent to the operating system, at least as far as adobe products are concerned. The stuff I found about that issue seemed to be on Windows. Are you dual booting this box? -- Toby Bluhm Alltech Medical Systems America, Inc. 30825 Aurora Road Suite 100 Solon Ohio 44139 440-424-2240 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Tom Brown wrote: Yeah, that PS appears to have only one outlet (unless i'm not seeing it in the photo), most redundant PS's have seperaate outlets for a Y power cable one for each supply. Guess it's not that redundant. yes - although i would never use a Y cable - Dual PSU's need 2 feeds from seperate PDU's Unless you have another source of AC power or want to use two UPS, then it's not important. -- Toby Bluhm Alltech Medical Systems America, Inc. 30825 Aurora Road Suite 100 Solon Ohio 44139 440-424-2240 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Tom Brown wrote: Just for fun, the first hit on a google for redundant atx power supply http://www.directron.com/tc400r8.html Seems you can just plop one into your std atx chassis . . . i have never understood how something with a single feed can be termed 'redundant' Yes, that doesn't make sense, even aside from the fact that the connected UPS is about as likely to fail as the PS itself. One of the big values of having dual power supplies with two power cords is that you can move the plugs from one outlet to another while it is still running (e.g. to replace the UPS, move to a new location while connected to a small UPS, or just to move the cord to a different outlet). -- Les Mikesell [EMAIL PROTECTED] ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Therese Trudeau wrote: ACTUALLY I totally forgot. I absoluteluy can not use software raid. Because I use Adobe products. Adobe products do not install well on software raid systems, and tend to crash on software raid beacuse of their activation process. If I go raid, I absolutely need a hardware raid which is entirely transparent to the operating system, at least as far as adobe products are concerned. The stuff I found about that issue seemed to be on Windows. Are you dual booting this box? No, read this: http://by114w.bay114.mail.live.com/mail/ReadMessageLight.aspx?Aux=14%7c0%7c8CA53FEB6F84AE0%7cFolderID=----0001InboxSortAscending=FalseInboxSortBy=DateReadMessageId=7c63352d-9f07-476b-b568-56a3b3aeb8c8n=562513198 my previous thread... Sorry, I can't access your Windows Live Hotmail inbox . . . -- Toby Bluhm Alltech Medical Systems America, Inc. 30825 Aurora Road Suite 100 Solon Ohio 44139 440-424-2240 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Therese Trudeau wrote: What do you think of alternative back up systems, such as a tape backup with bare metal restore software? I'd go that route instead if I could fine a solution which would allow me to restore to different hardware, i.e. if my motherboard dies and I need to buy a different brand or model MB. I know Storix back up software has this capability - I use storix on my Linux server with RAID 1. @ home I have one Linux and one Windows desktop machine. raid is no substitute for backup, raid is strictly for maintaining 24/7 uptime in the face of hardware failures, which is total overkill for your desktop. Skip RAID entirely Instead, get some external USB drives. on the linux machine, use 'dump' or 'tar' or whatever in a script to make backups, on the windows machine, get and use Acronis DiskImage, which has a bare metal restore from a bootable CD-R you can build. build the windows system so the c: 'system' drive is only about 30-40GB, plenty big enough for the OS plus all your mainstream applications (adobe, etc), and use a D: drive for /all/ your data, including your user account profile. this way the bare metal restore only has to restore said C:, and you can use incremental datafile oriented backup techniques for the D: 'data' drive. do much the same with linux, a modest / and a seperate /home ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
John R Pierce wrote: Robert Arkiletian wrote: On 3/10/08, nate [EMAIL PROTECTED] wrote: You can turn on write back caching if you have a UPS as well (provided your UPS is wired into your system for a graceful shutdown) Hopefully you have a redundant PS unit. Having a UPS is not going to help if your PS fails. redundant power supplies connected to redundant UPS's. I've seen more UPS failures than I've ever had failed PSUs on proper server grade hardware. Exactly - You can expect a UPS to need new batteries every few years, but I had one machine with a 4+year uptime (and only because I was able to move power cords, change UPS's, and swap it's mirrored hard drives on the fly). The machine is still running (RH 7.3) but it's less critical now and I was too lazy to drag along a UPS when I had to move it to a different location. -- Les Mikesell [EMAIL PROTECTED] ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommendations for a “real RA ID 1 card on Centos box
Robert Arkiletian wrote: On 3/10/08, nate [EMAIL PROTECTED] wrote: You can turn on write back caching if you have a UPS as well (provided your UPS is wired into your system for a graceful shutdown) Hopefully you have a redundant PS unit. Having a UPS is not going to help if your PS fails. redundant power supplies connected to redundant UPS's. I've seen more UPS failures than I've ever had failed PSUs on proper server grade hardware. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
