On Dec 12, 2012, at 5:29 AM, Craig Ringer <cr...@2ndquadrant.com> wrote:
> On 12/12/2012 09:17 AM, Evgeny Shishkin wrote: >> >> Actually most of low-end SSDs don't do write caching, they do not have >> enough ram for that. Sandforce for example. >> > Or, worse, some of them do limited write caching but don't protect their > write cache from power loss. Instant data corruption! > > I would be extremely reluctant to use low-end SSDs for a database server. > >> If we are talking about dedicated machine for database with ssd drives, why >> would anybody don't by hardware raid for about 500-700$? > I'd want to consider whether the same money is better spent on faster, higher > quality SSDs with their own fast write caches. > High quality ssd costs 5-7$ per GB. Consumer grade ssd - 1$. Highend - 11$ New intel dc s3700 2-3$ per GB as far as i remember. So far, more than a year already, i bought consumer ssds with 300-400$ hw raid. Cost effective and fast, may be not very safe, but so far so good. All data protection measures from postgresql are on, of course. > -- > Craig Ringer http://www.2ndQuadrant.com/ > PostgreSQL Development, 24x7 Support, Training & Services
