On Sat, February 22, 2014 06:27, Facundo Curti wrote: > Hi all. I'm new in the list, this is my third message :) > First at all, I need to say sorry if my english is not perfect. I speak > spanish. I post here because gentoo-user-es it's middle dead, and it's a > great chance to practice my english :) Now, the problem.
First of all, there are plenty of people here who don't have English as a native language. Usually we manage. :) > I'm going to get a new PC with a disc SSD 120GB and another HDD of 1TB. > But in a coming future, I want to add 2 or more disks SSD. > > Mi idea now, is: > > Disk HHD: /dev/sda > /dev/sda1 26GB > /dev/sda2 90GB > /dev/sda3 904GB > > Disk SSD: /dev/sdb > /dev/sdb1 26GB > /dev/sdb2 90GB > /dev/sdb3 4GB > > And use /dev/sdb3 as swap. (I will add more with another SSD in future) > /dev/sda3 mounted in /home/user/data (to save data unused) Why put the swap on the SSD? > And a RAID 1 with: > md0: sda1+sdb1 / > md1: sda2+sdb2 /home > > (sda1 and sda2 will be made with the flag: write-mostly. This is useful > for > disks slower). > In a future, I'm going to add more SSD's on this RAID. My idea is the > fastest I/O. > > Now. My problem/question is: > Following the gentoo's > doc<http://www.gentoo.org/doc/es/gentoo-x86+raid+lvm2-quickinstall.xml>, > it says I need to put the flag --metadata=0.9 on the RAID. My question is > ¿This will make get off the performance?. metadata=0.9 might be necessary for the BIOS of your computer to see the /boot partition. If you use an initramfs, you can use any metadata you like for the root-partition. > I only found this > document<https://raid.wiki.kernel.org/index.php/RAID_superblock_formats#The_version-0.90_Superblock_Format>. > This says the difference, but nothing about performance and > advantages/disadvantages. > > Another question is, ¿GRUB2 still unsupporting metadata 1.2? See reply from Canek. > In case that metadata get off performance, and GRUB2 doesn't support this. > ¿Anyone knows how can I fix this to use metadata 1.2? > > I don't partitioned more, because I saw this unnecessary. I just need to > separate /home in case I need to format the system. But if I need to > separate /boot to make it work, I don't have problems doing that. > > But of course, /boot also as RAID... /boot seperate as RAID-1 and metadata=0.9 and you are safe. > ¿Somebody have any ideas to make it work? It is similar to what I do, except I don't have SSDs in my desktop. I have 2 partitions per disk: 1 : /boot (mirrored, raid-1) 2 : LVM (striped, raid-0) All other partitions (root, /usr, /home, ....) are in the LVM. I use striping for performance reasons for files I currently work with. All important data is stored and backed up on a server. For this, an initramfs is required with support for mdraid and lvm. > Thank you all. Bytes! ;) You're welcome and good luck. Please let us know what the performance is like when using the setup you are thinking off. -- Joost
