Re: [RAID 5]Which tower?

Andreas Sheriff schrieb:

> Have you given any thought about external, hardware raid?
> And stripe and mirror everything. RAID 0+1

In addition to that, I would go for 3 or 5+ disks and use ASM. Why? ASM can do everything for you that soft-RAID does for you and if you have hardware-RAID you can use external redundancy. As to explain why 3,5 or 7 disks, control-files and redo have to be high redundancy on ASM, thats 3 disks minimum having capacity of 1/3. Then put rest of devices in a disk-group with normal redundancy for datafiles. Or have all your drives in one disk-group with high redundancy. On my testing machine I have the following setup: 1 x 18GB SCSI for system and Oracle-Binaries 2 x 36GB SCSI with normal redundancy for datafiles 3 x 9GB SCSI with high redundancy for controlfiles and redo 2 x 9GB SCSI with normal redundancy for flashback and archived logs 1 x 20GB IDE for various things and as a second location for archived logs

> Also Note: RAID 5 is better for reading. RAID 1 is better for writing.

If you are going with software, I would recommend ASM. ASM makes management easy especially if you have a disk-failure.

hth,

   Moritz Received on Sat Nov 12 2005 - 17:03:35 CST