I consider that the main use case ;p
On Thu, Oct 3, 2013 at 8:38 PM, Mike Oxford <moxf...@gmail.com> wrote: > One more use-case for backups: If you're running a big cluster and UserX > makes a bad code deploy which horks a bunch of data ... restore may be the > only option. > > It happens. > > -mox > > > On Wed, Oct 2, 2013 at 12:12 PM, John E. Vincent < > lusis.org+riak-us...@gmail.com> wrote: > >> I'm going to take a competing view here. >> >> SAN is a bit overloaded of a term at this point. Nothing precludes a SAN >> from being performant or having SSDs. Yes the cost is overkill for fiber >> but iSCSI is much more realistic. Alternately you can even do ATAoE. >> >> From a hardware perspective, if I have 5 pizza boxes as riak nodes, I can >> only fit so many disks in them. Meanwhile I can add another shelf to my SAN >> and expand as needed. Additionally backup of a SAN is MUCH easier than >> backup of a riak node itself. It's a snapshot and you're done. Mind you >> nothing precludes you from doing LVM snapshots in the OS but you still need >> to get the data OFF that system for it to be truly backed up. >> >> I love riak and other distributed stores but backing them up is NOT a >> solved problem. Walking all keys, coordinating the take down of all your >> nodes in a given order or whatever your strategy is a serious pain point. >> >> Using a SAN or local disk also doesn't excuse you from watching I/O >> performance. With a SAN I get multiple redundant paths to a block device >> and I don't get that necessarily with local storage. >> >> Just my two bits. >> >> >> >> On Wed, Oct 2, 2013 at 2:18 AM, Jeremiah Peschka < >> jeremiah.pesc...@gmail.com> wrote: >> >>> Could you do it? Sure. >>> >>> Should you do it? No. >>> >>> An advantage of Riak is that you can avoid the cost of SAN storage by >>> getting duplication at the machine level rather than rely on your storage >>> vendor to provide it. >>> >>> Running Riak on a SAN also exposes you to the SAN becoming your >>> bottleneck; you only have so many fiber/iSCSI ports and a fixed number of >>> disks. The risk of storage contention is high, too, so you can run into >>> latency issues that are difficult to diagnose without looking into both >>> Riak as well as the storage system. >>> >>> Keeping cost in mind, too, SAN storage is about 10x the cost of consumer >>> grade SSDs. Not to mention feature licensing and support... The cost >>> comparison isn't favorable. >>> >>> Please note: Even though your vendor calls it a SAN, that doesn't mean >>> it's a SAN. >>> On Oct 1, 2013 11:08 PM, "Guy Morton" <guy.mor...@bksv.com> wrote: >>> >>>> Does this make sense? >>>> >>>> -- >>>> Guy Morton >>>> Web Development Manager >>>> Brüel & Kjær EMS >>>> >>>> This e-mail is confidential and may be read, copied and used only by >>>> the intended recipient. If you have received it in error, please contact >>>> the sender immediately by return e-mail. Please then delete the e-mail and >>>> do not disclose its contents to any other person. >>>> >>>> >>>> _______________________________________________ >>>> riak-users mailing list >>>> riak-users@lists.basho.com >>>> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >>>> >>> >>> _______________________________________________ >>> riak-users mailing list >>> riak-users@lists.basho.com >>> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >>> >>> >> >> _______________________________________________ >> riak-users mailing list >> riak-users@lists.basho.com >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >> >> > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > -- /* Sincerely -------------------------------------------------------------- Pedram Nimreezi - Chief Technology Officer */ // The hardest part of design … is keeping features out. - Donald Norman
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