|
Size: 2026
Comment:
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Size: 2186
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 17: | Line 16: |
| sda1 256M | sda1 512M |
| Line 21: | Line 20: |
| sdb1 256M | sdb1 512M |
| Line 45: | Line 44: |
| 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 our of memory. | 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. |
| 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 ext4 myself, and have chosen this for its stability, but any modern filesystem should be sufficient. |
|
| Line 54: | Line 55: |
| /dev/vg_system/root / (btrfs) /dev/md0 /boot (btrfs) |
/dev/vg_system/root / (ext4) /dev/md0 /boot (ext4) |
| Line 64: | Line 65: |
| sdc 2T sdc1 1856G |
sdc 6T sdc1 5588G |
| Line 67: | Line 68: |
| sdd 2T sdd1 1856G |
sdd 6T sdd1 5588G sde 6T sdd1 5588G |
| Line 74: | Line 78: |
| md2 raid1 (sdc1, sdd1) | md2 raid5 (sdc1, sdd1, sde1) |
| Line 93: | Line 97: |
| vg_storage swap 4G (swap) | vg_storage swap 4G (/dev/vg_storage/swap) |
| Line 99: | Line 103: |
| /dev/vg_storage/media /mnt/media (btrfs) | /dev/vg_storage/media /mnt/media (ext4) |
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 512M sda2 15360M sdb 16G sdb1 512M sdb2 15360M
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 ext4 myself, and have chosen this for its stability, but any modern filesystem should be sufficient.
/dev/vg_system/root / (ext4) /dev/md0 /boot (ext4) /dev/vg_system/swap (swap)
KVM Host Disks for Guest Filesystem Images
Physical Disks and Partitions
sdc 6T sdc1 5588G sdd 6T sdd1 5588G sde 6T sdd1 5588G
Raid
md2 raid5 (sdc1, sdd1, sde1)
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 (ext4)