|
Size: 2034
Comment:
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Size: 2165
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 sda2 15360M |
sda1 512M sda2 128M sda3 15360M |
| Line 21: | Line 21: |
| sdb1 256M sdb2 15360M |
sdb1 512M sdb2 128M sdb3 15360M |
| Line 29: | Line 30: |
| md1 raid1 (sda2, sdb2) | md1 raid1 (sda3, sdb3) |
| Line 45: | Line 46: |
| 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. | Initially the swap partition was 256MM, 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 49: |
| vg_system root 2G (/dev/vg_system/root) vg_system swap 512M (/dev/vg_system/swap) |
vg_system root 3G (/dev/vg_system/root) vg_system swap 256M (/dev/vg_system/swap) |
| Line 53: | Line 54: |
| I use btrfs myself, and have chosen this for its stability, but any modern filesystem should be sufficient. |
|
| Line 55: | Line 58: |
| /dev/md0 /boot (btrfs) | /dev/md0 /boot (btrfs) |
| Line 64: | Line 67: |
| sdc 2T sdc1 1856G |
sdc 6T sdc1 5588G |
| Line 67: | Line 70: |
| sdd 2T sdd1 1856G |
sdd 6T sdd1 5588G sde 6T sde1 5588G sdf 6T sdf1 5588G |
| Line 74: | Line 83: |
| md2 raid1 (sdc1, sdd1) | md2 raid10 (sdc1, sdd1, sde1, sdf1) |
| Line 93: | Line 102: |
| vg_storage swap 4G (swap) | |
| Line 98: | Line 106: |
| /dev/vg_storage/swap (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 512M sda2 128M sda3 15360M sdb 16G sdb1 512M sdb2 128M sdb3 15360M
Raid
md0 raid1 (sda1, sdb1) md1 raid1 (sda3, sdb3)
Luks
md1 luks (md1_crypt)
LVM
md1_crypt lvm (vg_system)
LVM Volumes
Initially the swap partition was 256MM, 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 3G (/dev/vg_system/root) vg_system swap 256M (/dev/vg_system/swap)
Filesystems and Mountpoints
I use btrfs myself, and have chosen this for its stability, 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 sde 6T sde1 5588G sdf 6T sdf1 5588G
Raid
md2 raid10 (sdc1, sdd1, sde1, sdf1)
Luks
md2 luks (md2_crypt)
LVM
md2_crypt lvm (vg_storage)
LVM Volumes
vg_storage media 4G (/dev/vg_storage/media)
Filesystems and Mountpoints
/dev/vg_storage/media /mnt/media (btrfs)