I think you have that backwards my man -----Original Message----- From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Dupris, Mike Sent: Monday, April 30, 2007 5:30 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: RAID 1 Raid 1 out performs Raid 0 but is riskier because of the lack of redundancy. Raid 1 is better best used for basic "stuff" that you can easily get back on due to failure (NOS, easy applications quickly installed) -think if you can rebuild it from disk (or blast down from an image) then do a basic restore of a limited amount of settings or configurations (from file) and your operation is back up and running then RAID 1 is better for performance. Raid 0 is delayed because of the read & compare then delete & writes. Raid 1 spreads data across disks thereby spreading out the disk operations across the array (relieving bottlenecks.) Temporary files and system pagefiles can be kept on a single independent disk (rather than the same disk -remember we are trying to limit the times we have to wait on the arm to position the head on one of the platters -for the matter, we are also wanting to remove overhead on an array controller.) Risk: if that disk the temp/system file is located on fails during production, that could cause a serious issue if your system relies upon heavy pagefile use. Transactions or archives should not be kept on Raid 1. RAID 1 should not be used if the application's "presence" is not managed for you (Clustered VIP, Farm) -I guess I am saying, if the box goes down and you have another host that is going to handle the load then you shouldn't be afraid to use RAID 1 over 0. Here is a high performance production setup for Clustered or Farmed boxes [NOS] 3 disks, raid 1, controller A, disk cache enabled, PCI bus X (I like at least 3 for dedicated OS ,volume -single patrician) [TEMP] 1 disk, independent disk, disk cache enabled, controller B, PCI bus Y [DATA] Multiple disks, raid 5 or 10, disk write-through if Database, controller C or SAN attached, PCI bus Z or SAN attached Where XYZ are placeholders for whatever dedicated PCI buses are available on your system. Mike Dupris From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Andrew Wood Sent: Monday, April 30, 2007 7:45 AM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: RAID 1 I've always wanted to do this but never had the time - it'd be interesting to note what the performance gain was in relation to the fact that you increase your risk of causing an outage due to a single disk failure. From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Shonk Sent: 28 April 2007 15:38 To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: RAID 1 It's a very interesting question indeed. Which blades are you using? What kind of i/o controller? Putting the pagefile (alone) on a second partition will help performance with regards that the pagefile will be create as one large continuous(non fragmented) file. With some controllers (those with NO cache), you can see an increase in performance by not using RAID 1 and have two independent spindles and put the pagefile, temp dirs, and spooler on the second drive. But if you are going to do that, then why not set it up a RAID 0 with a second partition for the pagefile. We literally 2x the performance in reads and writes with the configuration over RAID 1. Joe On 4/27/07, Charles Watts <gregwatts77@xxxxxxxxxxx> wrote: We are using HP Blades with RIAD 1 for our Citrix Servers on Windows Server 2003 SP1. My question is would we get better disk i/o performance if we partioned the RAID 1 into two partitions and stuck the page file, temp directories and programs on the second partition? If not has any one used a RAMDISK for this? Or is their an argument for eliminating RAID 1 altogether and just put the page file, temp directories on the second hard drive (better performance and more disk space). Since I have a boat load of blades where is the risk? So I lose one or two drives a year on my servers and each time 50 - 60 users get kicked off. heck! I do that accidently at least once a year!? Managment might not buy that argument but If the performance gain is significant then it's worth it. Your thoughts? Thanks, Greg SBC SITES ONLY GOOGLE SEARCH: http://www.F1U.com ************************************************ For Archives, RSS, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: //www.freelists.org/list/thin ************************************************