Comment on Magical Block Store: Why EBS Can't WorkparentComments−blantonl15yDepending on the instance that you have provisioned, you have anywhere from 1 to 4 ephemeral (local) disks available to your instance.They are typically available as /dev/sd[bcde]In centOS, implementing a RAID-0 block device across 2 ephemeral disks that is present on an m1.large instance can be done via the following:mdadm --create /dev/md0 --metadata=1.1 --level=0 --quiet --run -c 256 -n 2 /dev/sdb /dev/sdcYou'll then need to format the block device with your fs of choice. Then mount it from there.−count15yJust remember the super important keyword:ephemeralWHEN your EC2 node disappears (and it will), you will lose everything on that RAID.That's not a bad thing if you know it'll happen and plan for it, but do be aware of it.
Comments
Depending on the instance that you have provisioned, you have anywhere from 1 to 4 ephemeral (local) disks available to your instance.
They are typically available as /dev/sd[bcde]
In centOS, implementing a RAID-0 block device across 2 ephemeral disks that is present on an m1.large instance can be done via the following:
mdadm --create /dev/md0 --metadata=1.1 --level=0 --quiet --run -c 256 -n 2 /dev/sdb /dev/sdc
You'll then need to format the block device with your fs of choice. Then mount it from there.
Just remember the super important keyword:
ephemeral
WHEN your EC2 node disappears (and it will), you will lose everything on that RAID.
That's not a bad thing if you know it'll happen and plan for it, but do be aware of it.