On Fri, Oct 08, 2010 at 05:31:28PM -0700, Dave Viner wrote:
> Has anyone found solid step-by-step docs on how to raid0 the ephemeral disks
> in ec2 for use by Cassandra?
No, but here's a script I used to raid0 3 ephemerals in an xlarge instance.
You can edit the top part for different configs for
Has anyone found solid step-by-step docs on how to raid0 the ephemeral disks
in ec2 for use by Cassandra?
On Fri, Oct 8, 2010 at 12:11 PM, Jason Horman wrote:
> We are currently using EBS with 4 volumes striped with LVM. Wow, we
> didn't realize you could raid the ephemeral disks. I thought the
Creating more ColumnFamilies in more Keyspaces creates more memory overhead. I
do not believe sharding your data is the way to go with cassandra.
You mentioned that you read 200 to 300 keys per request, and it sounded like
all this data was for a single user. If you can group all the user data
We are currently using EBS with 4 volumes striped with LVM. Wow, we
didn't realize you could raid the ephemeral disks. I thought the
opinion for Cassandra though was that the ephemeral disks were
dangerous. We have lost of a few machines over the past year, but
replicas hopefully prevent real troub
Two things that can help:
In 0.6.5, enable the dynamic snitch with
-Dcassandra.dynamic_snitch_enabled=true
-Dcassandra.dynamic_snitch=cassandra.dynamic_snitch_enabled
which if you are doing a rolling restart will let other nodes route
around the slow node (at CL.ONE) until it's warmed up (by the
We are experiencing very slow performance on Amazon EC2 after a cold boot.
10-20 tps. After the cache is primed things are much better, but it would be
nice if users who aren't in cache didn't experience such slow performance.
Before dumping a bunch of config I just had some general questions.
