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From Jon Haddad <>
Subject Re: AWS ephemeral instances + backup
Date Thu, 05 Dec 2019 22:06:00 GMT
You can easily do this with bcache or LVM

Medusa might be a good route to go down if you want to do backups instead:

On Thu, Dec 5, 2019 at 12:21 PM Carl Mueller
<> wrote:

> Does anyone have experience tooling written to support this strategy:
> Use case: run cassandra on i3 instances on ephemerals but synchronize the
> sstables and commitlog files to the cheapest EBS volume type (those have
> bad IOPS but decent enough throughput)
> On node replace, the startup script for the node, back-copies the sstables
> and commitlog state from the EBS to the ephemeral.
> As can be seen:
> the (presumably) spinning rust tops out at 2375 MB/sec (using multiple EBS
> volumes presumably) that would incur about a ten minute delay for node
> replacement for a 1TB node, but I imagine this would only be used on higher
> IOPS r/w nodes with smaller densities, so 100GB would be about a minute of
> delay only, already within the timeframes of an AWS node
> replacement/instance restart.

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