Larger block sizes for ( especially for metadata, to provide perf improvements in some cases)
Scrubbing uses CRC to varify data on disk, fixes bad ones with good copy on another disk which has okay CRC
“df ” gives completely wrong values on how full the disk is or it’s size
discard/trim supported both real time and batched
Drive Swapping – current raid rebuilds via balance code, can also restripe between RAID levels
btrs send/receive in development
Embedded – friendly to small machines, not as friendly to small disks (being worked on) Works well with low-end flash drives
RAID 5/6 – MErge pending completion of fsck work. will also add triple mirroring
beta read-only filesystem recovery tool – copies data out of corrupt FS
tree root-history log lets us recovery from many hardware errors. “mount -recover”
New fsck release on the way. May be announced very soon
yum-plugin-fs-snapshot . yum plug to trigger a snapshot on package install/upgrades
The Web as an application development platform – Shane Stephens and Mike Lawther
When and how to move from native to web/cloud apps
Examples
Text based like email (pine, mutt, outlook). 15 years ago web-based email started. access anywhere, no install required, easy to start using, use anywhere
Desktop publishing. Hard to collaborate with other people using desktop based software by emailing docs around to other people. On the web it’s often native multi-user. Send Links rather than emailing whole doc.
On web everybody always running latest version
Github gives you one-stop shop for projects. wiki, forums etc. Native in app rather than bolt on to desktop version
Graphics
Flickr – has native sharing, backups etc
Online editing of images etc now possible
Games
Farmville – no install, easy to share links
Angry Birds – has web version, html5 , flash for sound, 60fps
Not at stage where First person shooters going to happen yet. Users have high end hardware
Overall Benefits – No install, universal access to data, always using latest version, collaboration and sharing built in. Simple text layout, Web as IDE, open and modular enviroment
Drawbacks – Layout more involved than desktops apps, distributed code makes debugging hard, cross browser compatibility, security limits flexibility.
Useful web technologies (see also HTML5Rocks website) :
Display / Rendering
HTML , SVG , Canvas – All fairly easy to combine
WebGL , flexbox and grid <- future
Communications
Standard http requests, AJAX / XHR , Websockets / Browser Channel , libraries like Faye etc
Storage
Traditionally just cookies, Session Storage, Local Storage, indexDb, AppCache
