Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 01/05/2011 03:26 PM, J wrote: > On 1/5/2011 12:49 PM, Digimer wrote: >> On 01/05/2011 11:48 AM, J wrote: >>> Hello, >>> >>> This is my first go at setting up any HA services, so I wanted to see if >>> anyone on the list had a similar setup or any recommendations on doing >>> this better using drbd. >>> >>> I'm setting up 2 servers with 2 application services on them. One >>> application service is postgresql database (about 5GB of data in >>> database). The other is custom software that does a lot of file-based >>> I/O (about 15GB of files) with a custom TCP server in front of it. >>> >>> My idea is to have one server being the master for the custom software >>> and the other being the master >>> for the postgresql database. The other server will be a stand by for the >>> other service. Both will run run ubuntu 10.04 LTS and be connected by 2 >>> cat6 1Gb cables. >>> >>> This will hopefully distribute the load, as I am worried about the >>> postgresql clobbering the custom software (which requires very high >>> responsiveness). >>> >>> So is setting up 2 brbd's in opposite configurations on 2 hosts a good >>> idea? I'm mostly worried about >>> performance and the headache of admin if the links go down. 2 cases of >>> split brain on 2 boxes >>> doesn't sound fun at all. >>> >>> Thanks! >>> J >> If you are using platter-based HDDs, then I'd strongly recommend >> creating two separate resources on two separate HDD(s). This way you >> won't suffer I/O penalties with the read/write heads flying back and >> forth. >> >> Give your relatively small storage requirements though, I'd even more >> highly recommend SSDs providing that the write-cycle limit is within >> reason. In this setup, then you should have no trouble running it all on >> one resource as there are no heads to flog. >> >> In any case, be sure to have (at least) RAID 1 on each node backing the >> DRBD devices to help minimize downtime. Drives fail fairly frequently... >> software RAID 1 is an inexpensive route to much better uptime. :) >> >> > > Thanks for the recommendation. > > I agree, I think that SSD's will be a great solution and I'll put in for > 4 256GB ones *sweet*. I've still got a lot of things to figure out, so > I'm sure I'll be back. Thanks for your help! > > J Anytime, have fun! :) -- Digimer E-Mail: digimer at alteeve.com AN!Whitepapers: http://alteeve.com Node Assassin: http://nodeassassin.org