Re: New Servers - Cassandra 4

2021-08-12 Thread Elliott Sims
Depends on your availability requirements, but in general I'd say if you're going with N replicas, you'd want N failure domains (where one blade chassis is a failure domain). On Tue, Aug 10, 2021 at 11:16 PM Erick Ramirez wrote: > That's 430TB of eggs in the one 4U basket so consider that agains

Re: New Servers - Cassandra 4

2021-08-10 Thread Erick Ramirez
That's 430TB of eggs in the one 4U basket so consider that against your MTTR requirements. I fully understand the motivation for that kind of configuration but *personally*, I wouldn't want to be responsible for its day-to-day operation but maybe that's just me. 😁

Re: New Servers - Cassandra 4

2021-08-10 Thread onmstester onmstester
Hi, What about this type of blades, which gives you about 12 (commodity) servers  in 3U: https://www.supermicro.com/en/products/microcloud Sent using https://www.zoho.com/mail/ On Tue, 03 Aug 2021 02:01:13 +0430 Joe Obernberger wrote Thank you Max.  That is a solid choice. 

Re: New Servers - Cassandra 4

2021-08-02 Thread Joe Obernberger
Thank you Max.  That is a solid choice.  You can even configure each blade with two 15TBytes SSDs (may not be wise), but that would yield ~430TBytes of SSD across 14 nodes in 4u space for around $150k. -Joe On 8/2/2021 4:29 PM, Max C. wrote: Have you considered a blade chassis?  Then you can g

Re: New Servers - Cassandra 4

2021-08-02 Thread Max C.
Have you considered a blade chassis? Then you can get most of the redundancy of having lots of small nodes in few(er) rack units. SuperMicro has a chassis that can accommodate 14 servers in 4U: https://www.supermicro.com/en/products/superblade/enclosure#4U - Max > On Aug 2, 2021, at 12:05 pm,

Re: New Servers - Cassandra 4

2021-08-02 Thread Joe Obernberger
Thank you Jeff.  Consider that if rack space is at a premium, what would make the most sense? -Joe On 8/2/2021 2:46 PM, Jeff Jirsa wrote: IF you bought a server with that topology, you would definitely want to run lots of instances, perhaps 24, to effectively utilize that disk space. You'd

Re: New Servers - Cassandra 4

2021-08-02 Thread Jeff Jirsa
IF you bought a server with that topology, you would definitely want to run lots of instances, perhaps 24, to effectively utilize that disk space. You'd also need 24 IPs, and you'd need a NIC that could send/receive 24x the normal bandwidth. And the cost of rebuilding such a node would be 24x high

New Servers - Cassandra 4

2021-08-02 Thread Joe Obernberger
We have a large amount of data to be stored in Cassandra, and if we were to purchase new hardware in limited space, what would make the most sense? Dell has machines with 24, 8TByte drives in a 2u configuration. Given Cassandra's limitations (?) to large nodes, would it make sense to run 24 copi