storage panel:

storage in the context of cloud and network (no slides....)

intersection of storage, sdn and computing
system management paradigm important
redefines what is to sell IT
slaf? (an open source storage cluster stack built on commodity hardware)
sotware defined storage align with SDS: volume management, virtual network + virtual storage device,)

 I have no idea what he talked about for 5 minutes.....


reserch problems in software defined storage (NetApp)

trends in storage in datacenter: hetoragilty, dynamic, sharing, and ???
sotware define storage: have all types/layers storage components to seamlessly communicate with each other, and in a way which abstracts out details (like wheter you support dedup or not)

He has a tabke of SLO language (which is worth looking up later)
different stackts for different SLO at different cost points
SLO a core idea and need to be standardized 

storage management not in a single box, but at mulitple layers
isolation in performance and failure/security case
failure handling when one storage service is composed by multiple components (remzi covered layered structure, could be other structure)

now storage happens a little bit in hypervisor, virtual machine and application. which layer should do what? how do we coordinate different layers. 

new storage problems due to dynamism

want: data structure storage.


Evolution of software defined storage (VMware)
go back and look at how SDS changes, as we already have software defined storage
traditionally: hardware defined storage realized by special purpose boxes
clear boundaries between hardware/software, and limited interface: block read/wite
now interface is changing, and the enabling factors are:
1. commoditization of those big boxes
2. because cpu advances, hosts are more powerful and could have more intelligence, rather than, say, put dedup inside box
3. richer interface standards (like which offerred by SCSI, say, xcopy)
4. boxes simplifying, allowing applications to sepecify what they want
5. no distinction between server node and storage node anymore, just bricks (which has cpu, memory, flash and disk) -- already happening in Google, Facebook, etc. 

summary: software defined storage is what happens when distinction of server node and storage node blurs, and we have disruptive, share-nothing model(what does he mean by this???)

Storage Infrastructure Vision(Google)
google needs mulitple data centers
data consistency first class citizen now, scaliabilty, reliability and pricing problems
google infrastructure goal: not just look simple by outside users, look simple to application programmers too. Complexity managed by infrastructure operators, not application developers

Datacenter sotrage systems (Facebook)
chanlenges: 
1. sotware stack will be obsolete soon: (more cpus, not faster cus, faster storages, faster flatter networks)
2. heterogeneous workloads -- but you could potentially have specific datacenter for spedific things, so the workload no that different
3. heterogeneous hardware -- how to take advantage of different hardware profiles
4. dynamic applications -- need adaptive system

opportunies:
1. multi-threaded programming is clumsy -- new parallel programming paradigms
2. flash != hard disk -- new storage engine for flash
3. high speed network stack -- new network stack
4. dynamic system will win big -- high throughput vs. low latency, space vs time, data temperature aware


WISDOM discussion (microsoft)
COSMOS:
   service internal to micorsoft, used for batch procesing and analytics
   chanlanges:
         transient outliers can pummel performance, thus hard to reason
         any storage nodes servicing multiple sytpes of requests
         exploiting cheap bandwidth (flat network), but we always have storage outpaces network