Check the IO utilisation using iostat You *really* should not need to make HH run faster, if you do there is some thing bad going on. I would consider dropping the hints and running repair.
> Data is ~9.5 TB Do you have 9.5TB on a single node ? In the normal case it's best to have around 300 to 500GB per node. With that much data is will take a week to run repair or replace a failed node. Cheers ----------------- Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.com On 6/03/2013, at 1:22 PM, Kanwar Sangha <kan...@mavenir.com> wrote: > Is this correct ? > > I have Raid 0 setup for 16 TB across 8 disks. Each disk is 7.2kRPM with IOPS > of 80 per disk. Data is ~9.5 TB > > So 4K * 80 * 9.5 = 3040 KB ~ 23.75 Mb/s. > > So basically I am limited at the disk rather than the n/w > > From: Kanwar Sangha [mailto:kan...@mavenir.com] > Sent: 06 March 2013 15:11 > To: user@cassandra.apache.org > Subject: RE: Hinted handoff > > After trying to bump up the “hinted_handoff_throttle_in_kb” to 1G/b per sec, > It still does not go above 25Mb/s. Is there a limitation ? > > > > From: Kanwar Sangha [mailto:kan...@mavenir.com] > Sent: 06 March 2013 14:41 > To: user@cassandra.apache.org > Subject: RE: Hinted handoff > > Got the param. thanks > > From: Kanwar Sangha [mailto:kan...@mavenir.com] > Sent: 06 March 2013 13:50 > To: user@cassandra.apache.org > Subject: Hinted handoff > > Hi – Is there a way to increase the hinted handoff throughput ? I am seeing > around 8Mb/s (bits). > > Thanks, > Kanwar
