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Windows Server Forum / Exchange Server / Design / March 2006RAID and Partition
Can some one confirm following configuration is effection for 100 Exchange 2003 users? - 6 ea SCSI 73G ea RAID system - RAID 1 (disk0 and disk1) for OS, Logs and Queue - RAID 10 (disk 2,3,4,5) for data Question: - Should I partition RAID1 to C: (20G) for OS, D: for others, any advantage - Is it better to have RAID 5 (instead RAID10) with HotSpare, so I have better protection? Thanks, JimmyChang I like to keep the logs seperate. With only 100 users you may want to consider a mirror for the OS and smtp queue a mirror for the logs a mirror for the databases If we assume 10K drives, a mirror will give you: writes = 85*2/2 or 85 IOPS reads = 85*2 04 170 IOPS With a 3:1 read/write ratio for the database applied: (170*.75) + (85*.25) = 127.5 + 21.25 = 148.75 IOPS > Can some one confirm following configuration is effection for 100 Exchange > 2003 users? [quoted text clipped - 10 lines] > Thanks, > JimmyChang similair question. DELL PE2800 with 8*36Gb 15k disks around 180 mailboxes. Thinking of RAID 1 for OS,Pagefile and then either RAID 10 for the remaning 6 disks with partitions for logs and DB or RAID 1 for logs and RAID 5+ hotspare >I like to keep the logs seperate. With only 100 users you may want to >consider [quoted text clipped - 27 lines] >> Thanks, >> JimmyChang RAID 1 for OS/Page File. RAID 1 for Logs RAID 0+1 For DBs When you build out the 2800, don't use Server Assist. Server Assist starts with a FAT partition that is later converted to NTFS. This results in an allocation unit size, or cluster size, of 512 bytes. IO to the page file is 4K. When an IO request larger than the allocation unit size hits the file system driver, it splits the request into multiple smaller requests. In this case, each time a page is swapped that's 8 IOs instead of 1. You want a 4K allocation unit size on the OS partition, which by the way, is the NTFS default. > similair question. > [quoted text clipped - 36 lines] >>> Thanks, >>> JimmyChang cheers for the tip about server assist, I'll watch out for that,altohuth I'm not expecting much paging as the server has 3Gb Ram cheers Kerry > RAID 1 for OS/Page File. > RAID 1 for Logs [quoted text clipped - 49 lines] >>>> Thanks, >>>> JimmyChang any recommendations as to the stripe size to use for the RAID 10 set? Kerry > RAID 1 for OS/Page File. > RAID 1 for Logs [quoted text clipped - 49 lines] >>>> Thanks, >>>> JimmyChang A relatively large multiple of 4K. > any recommendations as to the stripe size to use for the RAID 10 set? > [quoted text clipped - 54 lines] >>>>> Thanks, >>>>> JimmyChang default is a stripe size of 64k >A relatively large multiple of 4K. > [quoted text clipped - 56 lines] >>>>>> Thanks, >>>>>> JimmyChang which is 16x 4K. should be fine. > default is a stripe size of 64k > [quoted text clipped - 58 lines] >>>>>>> Thanks, >>>>>>> JimmyChang Thak you all! I think since I have 6 drives, probably the best to do 2+2+2 so to get the best performance and still have mirror protection. > which is 16x 4K. should be fine. > [quoted text clipped - 60 lines] > >>>>>>> Thanks, > >>>>>>> JimmyChang |
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