Difference between revisions of "FileSystems"

Latest revision as of 10:55, 5 August 2015

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 == EXT4 ==
-=== Calculating the Stride and Stripe-width ===
+* [[Configuring Ext4 Storage Pool with correct Disk Alignment]]
-* '''''Ext4 Block Size''''' = default 4KiB (not needed to change this value)
-* '''''Stride''''' = RAID chunk size / Ext4 block size
-* '''''Stripe-width''''' = Number of physical data disks * Stride
-==== Examples ====
-* '''RAID 0''' - 2 Disks - Stripe Size 64 KiB
-:* Ext4 BS = 4KiB
-:* Stride = 64 KiB / 4KiB = 16
-:* Stripe-width = 2 * 16 = 32
- mkfs.ext4 -b 4096 -E stride=16,stripe-width=32 <dev>
- # or simply:
- mkfs.ext4 -E stride=16,stripe-width=32 <dev>
-* '''RAID 1''' - Stripe Size - 128 KiB (AKA Chunk Size)
-:* Ext4 BS = 4KiB
-:* Stride = 128 KiB / 4KiB = 32
-:* Stripe-width = 1 * 32 = 32
- mkfs.ext4 -b 4096 -E stride=32,stripe-width=32 <dev>
- # or simply:
- mkfs.ext4 -E stride=32,stripe-width=32 <dev>
-* '''RAID 5''' - 4 Disks - Stripe Size 512 KiB
-:* Ext4 BS = 4KiB
-:* Stride = 512 KiB / 4KiB = 128
-:* Stripe-width = 3 * 128 = 384
- mkfs.ext4 -b 4096 -E stride=128,stripe-width=384 <dev>
- # or simply:
- mkfs.ext4 -E stride=128,stripe-width=384 <dev>
-* '''RAID 6''' - 10 Disks - Stripe Size 1 MiB = 1024 KiB
-:* Ext4 BS = 4KiB
-:* Stride = 1024 KiB / 4KiB = 256
-:* Stripe-width = 8 * 256 = 2048
- mkfs.ext4 -b 4096 -E stride=256,stripe-width=2048 <dev>
- # or simply:
- mkfs.ext4 -E stride=256,stripe-width=2048 <dev>