data storage notes

412/data.md

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+# Data storage
+
+## Spinning Disks
+
+Cheaper for more storage
+
+
+## RAID - Redundant Array of Independent Disk
+
+Raid 0: basically cramming multiple drives and treating them as one. Data is striped across the drives but if one fails then you literally lose a chunk of data.
+
+Raid 1: data is mirrored across the drives so it's completely redundant so if one fails the other is still alive. It's not a backup however since file updates will affect all the drives.
+
+Raid 5: parity. Combining multiple drives allows us to establish the parity of the data on other drives to recover that data if it goes missing.(min 3 drives)
+
+Raid 6: same in principle as raid 5 but this time we have an extra drive for just parity.
+
+Raid 10: 0 and 1 combined to have a set of drives in raid 0 and putting those together in raid 1 with another equally sized set of drives.
+
+## Network Attached Storage - NAS
+
+Basically space stored on the local network.
+
+## Storage Attached Network - SAN
+
+Applicable when we virtualise whole os's for users, we use a storage device attached to the network to use different operating systems
+
+
+# Managing Storage
+
+Outsourcing the storage for users to services like Onedrive because it becomes their problem and not ours.
+
+# Storage as a Service
+
+Ensure that the OS gets its own space/partition on a drive and give the user their own partition to ruin. That way the OS(windows) will just fill its partition into another dimension.
+
+
+# Print Services
+
+