Arch on SSD!

[Andrea Crotti <andrea.crotti.0@xxxxxxxxx>]

I bought a crucial M4 (128GB) for my laptop, and now the idea is to move
the operating system and most of the data there, keeping the other disk
in the cd-bay as second disk.

I formatted the SSD disk like this:

Disk /dev/sda: 128.0 GB, 128035676160 bytes, 250069680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ee70d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      411647      204800   83  Linux
/dev/sda2          411648   250069679   124829016   83  Linux

Where sda2 is a LVM volume, but the first thing which I'm not sure is if
I got the alignment correct.  I didn't find anywhere what should be the
alignment for my disk, and a way to check that you actually got it
right (some ways only for Windows funnily).

Any hint?

The second thing is that at the moment I should be able to boot both
disks, but the SSD now fails to load, and I'm a bit lost in the new
GRUB2 configuration:


MENUENTRY 'Arch GNU/Linux, with Linux core repo kernel' --class arch 
--class gnu-linux --class gnu --class os $menuentry_id_option 
'gnulinux-core repo kernel-true-ad4103fa-d940-47ca-8506-301d8071d467' {
    load_video
    set gfxpayload=keep
    insmod gzio
    insmod part_msdos
    insmod ext2
    set root='hd0,msdos5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 
--hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5 
ad4103fa-d940-47ca-8506-301d8071d467
    else
      search --no-floppy --fs-uuid --set=root 
ad4103fa-d940-47ca-8506-301d8071d467
    fi
    echo    'Loading Linux core repo kernel ...'
    linux    /boot/vmlinuz-linux 
root=UUID=ad4103fa-d940-47ca-8506-301d8071d467 ro  quiet
    echo    'Loading initial ramdisk ...'
    initrd    /boot/initramfs-linux.img
}


All I need to do is boot from disk (hd0, 0) and then the / is on LVM
/dev/ssd/root.

I'm not sure, however, if this configuration is supposed to make sense
or it's just autogenerated as a template..


The fstab for the SSD is this:

/dev/mapper/ssd-root    /             ext4 
 rw,relatime,data=ordered,discard    0 2

# UUID=54d06c44-2b32-4969-be42-d98d2bf7e994
/dev/sda1               /boot         ext4 
 rw,relatime,data=ordered,discard    0 2


but I've seen somewhere that ext4 might be a problem too, or is that
fixed?

Thanks a lot,
Andrea