Ok, if you're going to look into it, please keep me/us posted. It happen twice for me, the same day, within a few hours on the same node and only happened to 1 node out of 12, making this node almost unreachable.
2013/3/28 aaron morton <aa...@thelastpickle.com> > I noticed this on an m1.xlarge (cassandra 1.1.10) instance today as well, > 1 or 2 disks in a raid 0 running at 85 to 100% the others 35 to 50ish. > > Have not looked into it. > > Cheers > > ----------------- > Aaron Morton > Freelance Cassandra Consultant > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 26/03/2013, at 11:57 PM, Alain RODRIGUEZ <arodr...@gmail.com> wrote: > > We use C* on m1.xLarge AWS EC2 servers, with 4 disks xvdb, xvdc, xvdd, > xvde parts of a logical Raid0 (md0). > > I use to see their use increasing in the same way. This morning there was > a normal minor compaction followed by messages dropped on one node (out of > 12). > > Looking closely at this node I saw the following: > > http://img69.imageshack.us/img69/9425/opscenterweirddisk.png > > On this node, one of the four disks (xvdd) started working hardly while > other worked less intensively. > > This is quite weird since I always saw this 4 disks being used the exact > same way at every moment (as you can see on 5 other nodes or when the node > ".239" come back to normal). > > Any idea on what happened and on how it can be avoided ? > > Alain > > >
