View Full Version : [ubuntu] Few questions about LVM over RAID5

January 31st, 2012, 10:35 PM
I post this set of questions relating to creation of LVM over RAID 5 after searching multiple posts, I understand that there are multiple ways to get things done but at this point I am left with the following questions, I am new Linux/UBUNTU and didn't get any feedback to these questions on the "Absolutre Beginner" forum I hope to get more lucky here, thanks for your help:
I just installed UBUNTU on a 40GB SATA - sdd, I have additional 3 SATA drives 1.5 TB each = sda, sdb,sdc and I want to set LVM over RAID 5, I intend to assign the whole drive for the RAID.
1. Do I need to partition the drives for setting the RAID or I can go ahead and set the RAID5 over the whole drive devices without setting any partitions, from my search I understand that both is possible but not clear on which is better and why?
2. Assuming the above is that I need or should partition. Which command is the best for using script to do the partitioning: "parted" or "sfdisk" (or other command...)
3. What should be the partition type FD or DA or other type?
4. If I am using "parted" command to do the partitioning how do I set the type to FD or DA etc using parted or I must use sfdisk for doing RAID and LVM?
5. I understand that sfdisk can't handle large drives, can I still use it and set on each of my drives multiple / smaller partitions each can be created by sfdisk and create multiple RAID5 arrays based on the partitions and than assign all the RAIDs to the LVM so the LVM still see the whole storage? Does this extra partitioning and RAIDs affect performance?
6. What performance can I expect from LVM over RAID 5 if my system is ASUS E35M1 motherboard with AMD E350 Dual Core CPU and 4GB RAM SATA 3G drives for the RAID/LVM and SATA 1.5G for the system drive?