Differences between revisions 14 and 20 (spanning 6 versions)
⇤ ← Revision 14 as of 2017-12-25 22:03:11 →
Size: 1675
Editor: Kristian Kallenberg
Comment:
← Revision 20 as of 2018-01-03 11:38:29 → ⇥
Size: 2034
Editor: Kristian Kallenberg
Comment:
Deletions are marked like this. Additions are marked like this.
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md1_crypt lvm (vg1) md1_crypt lvm (vg_system)
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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 seconds volume was added too. 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.
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vg1 root 2G (/dev/vg1/root)
vg1 swap 1G (/dev/vg1/swap)		 vg_system root 2G   (/dev/vg_system/root)
vg_system swap 512M (/dev/vg_system/swap)
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/dev/vg1/root / (btrfs)
/dev/md0 /boot (btrfs)
/dev/vg1/swap (swap)		 /dev/vg_system/root / (btrfs)
/dev/md0 /boot       (btrfs)
/dev/vg_system/swap (swap)
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md2_crypt lvm (vg2) md2_crypt lvm (vg_storage)
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vg2 media 4G (/dev/vg2/media)
vg2 swap 4G (swap)		 vg_storage media 4G (/dev/vg_storage/media)
vg_storage swap 4G (swap)
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/dev/vg2/media /mnt/media (btrfs) /dev/vg_storage/swap (swap)
/dev/vg_storage/media /mnt/media (btrfs)

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 disks 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 15360M

sdb     16G
sdb1   256M
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

/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     2T
sdc1 1856G

sdd     2T
sdd1 1856G

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 (swap)

Filesystems and Mountpoints

/dev/vg_storage/swap             (swap)
/dev/vg_storage/media /mnt/media (btrfs)

None: KVM Host Disk Layout (last edited 2024-01-29 20:16:56 by Kristian Kallenberg)