With multiple data dirs you are still limited by the space free on any
one drive. So if you have two data dirs with 40GB free on each, and you
have 50GB to be compacted, it won't work, but if you had a raid, you
would have 80GB free and could compact...
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that says not to use multiple data dirs?
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On 28 Jun 2011, at 11:46, mcasandra wrote:
Which one is preferred RAID0 or spreading data files accross various disks on
the same node? I like RAID0 but what would be the most convincing argument
to put additional RAID controller card in the machine?
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If you have a quality HW raid controller with proper performance (and far from
all have good performance) you cam definitely benefit from a battery backed up
write cache on it, although the benefits will not be huge on raid 0.
Unless you get a really good price on that high performance HW raid
I thought there is an option to give multiple data dirs in cassandra.yaml.
What's the purpose of that?
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Not sure what the intended purpose is, but we've mostly used it as an
emergency disk-capacity-increase option. It's not as good as raid because
each disk size is counted individually (a compacted sstable can only be on
one disk) so compaction size limits aren't expanded as one might expect
wrote:
Not sure what the intended purpose is, but we've mostly used it as an
emergency disk-capacity-increase option. It's not as good as raid because
each disk size is counted individually (a compacted sstable can only be on
one disk) so compaction size limits aren't expanded as one might
