Re: cassandra disks cache on SSD

2016-04-03 Thread Mateusz Korniak
On Friday 01 April 2016 21:48:08 vincent gromakowski wrote: > 2016-04-01 19:27 GMT+02:00 Mateusz Korniak : > > We are using lvmcache for that. > > Can you provide me a approximate estimation of performance gain ? I suspect it depends on frequently read data size. If it fits into caching SSDs. In

Re: cassandra disks cache on SSD

2016-04-02 Thread Bryan Cheng
Hi Vincent, have you already tried the more common tuning operations like row cache? I haven't done any disk level caching like this (we use SSD's exclusively), but you may see some benefit from putting your commitlog on a separate conventional HDD if you haven't tried this already. This may push

Re: cassandra disks cache on SSD

2016-04-01 Thread vincent gromakowski
Can you provide me a approximate estimation of performance gain ? 2016-04-01 19:27 GMT+02:00 Mateusz Korniak : > On Friday 01 April 2016 13:16:53 vincent gromakowski wrote: > > (...) looking > > for a way to use some kind of tiering with few SSD caching hot data from > > HDD. > > I have identifi

Re: cassandra disks cache on SSD

2016-04-01 Thread Mateusz Korniak
On Friday 01 April 2016 13:16:53 vincent gromakowski wrote: > (...) looking > for a way to use some kind of tiering with few SSD caching hot data from > HDD. > I have identified two solutions (...) We are using lvmcache for that. Regards, -- Mateusz Korniak "(...) mam brata - poważny, domator, l