|
Size: 2026
Comment:
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Size: 2193
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 3: | Line 3: |
| This disk layout has several layers. It uses btrfs, on top of LVM, on top of luks encryption, on top of raid, on top of the disks partitions. | This disk layout has several layers. It uses btrfs, on top of LVM, on top of luks encryption, on top of raid, on top of the disk partitions. |
| Line 9: | Line 9: |
| Line 18: | Line 17: |
| sda2 15360M | sda2 15616M |
| Line 22: | Line 21: |
| sdb2 15360M | sdb2 15616M |
| Line 48: | Line 47: |
| vg_system root 2G (/dev/vg_system/root) | vg_system root 2G (/dev/vg_system/root) |
| Line 53: | Line 52: |
| I use btrfs myself, and has not had any problems with it. btrfs is chosen for its flexibility, but any modern filesystem should be sufficient. |
|
| Line 55: | Line 56: |
| /dev/md0 /boot (btrfs) | /dev/md0 /boot (btrfs) |
| Line 64: | Line 65: |
| sdc 2T sdc1 1856G |
sdc 6T sdc1 5588G |
| Line 67: | Line 68: |
| sdd 2T sdd1 1856G |
sdd 6T sdd1 5588G |
| Line 93: | Line 94: |
| vg_storage swap 4G (swap) | vg_storage swap 4G (/dev/vg_storage/swap) |
KVM Host Disk Layout
This disk layout has several layers. It uses btrfs, on top of LVM, on top of luks encryption, on top of raid, on top of the disk partitions.
Hardware
Two 16G SSD disks are used for the KVM Host. Two 2T SATA disks are used for the KVM Guests filesystem images.
Mark your disks! Spend time finding your disks S/N. Put a physical sticker on the disk. In the future this will help you identify a failing disk.
KVM Host Disks
Physical Disks and Partitions
sda 16G sda1 256M sda2 15616M sdb 16G sdb1 256M sdb2 15616M
Raid
md0 raid1 (sda1, sdb1) md1 raid1 (sda2, sdb2)
Luks
md1 luks (md1_crypt)
LVM
md1_crypt lvm (vg_system)
LVM Volumes
Initially the swap partition was 512M, but it ran full and was increased to 1G. That ran full as well, so a swap partition on the second volume was added too. It seems the KVM host happily swaps and will use many gigabytes of swap if the swap partition is there. The consequence is that the guests are slower to respond. So I recommend only swapping if you are really running out of memory.
vg_system root 2G (/dev/vg_system/root) vg_system swap 512M (/dev/vg_system/swap)
Filesystems and Mountpoints
I use btrfs myself, and has not had any problems with it. btrfs is chosen for its flexibility, but any modern filesystem should be sufficient.
/dev/vg_system/root / (btrfs) /dev/md0 /boot (btrfs) /dev/vg_system/swap (swap)
KVM Host Disks for Guest Filesystem Images
Physical Disks and Partitions
sdc 6T sdc1 5588G sdd 6T sdd1 5588G
Raid
md2 raid1 (sdc1, sdd1)
Luks
md2 luks (md2_crypt)
LVM
md2_crypt lvm (vg_storage)
LVM Volumes
vg_storage media 4G (/dev/vg_storage/media) vg_storage swap 4G (/dev/vg_storage/swap)
Filesystems and Mountpoints
/dev/vg_storage/swap (swap) /dev/vg_storage/media /mnt/media (btrfs)