our website moved to a new the 3rd hosting provider and now the performance and availability seems to be the best. Up till now we do not face any downtime reported by pingdom.com, although pingdom.com may have false alert sometimes.
our 1st hosting provider
actually the hosting is quite good if your website is not too heavy load, but you have to restart/reload your web server and database server frequently because there is no swap for openvz. the price is affordable and reasonable, although there is some alert by pingdom.com, but with such cost and just 1-2 alerts per month is acceptable.
last year they started to provide XEN framework VPS but we did not try yet. i think the service would be similar. if you have limited budget, it is a good choice for start.
our 2nd hosting provider
the hosting provided XEN framework VPS and have swap support. however, the downtime alert is too much and finally we decide to switch to another hosting……
our current hosting provider
no DOWNTIME alert from pingdom for 16 days!! it is a good news. In recent month, they have upgrade their bandwidth, then CPU, then now RAM. Although we did not yet upgrade our RAM, but i think we could upgrade it in near future. However, the only drawback is the cost if you have limited budget.
the migration is done and we got double RAM, cheer!