diff --git a/content/2.md b/content/2.md index 10faa36..0743fb9 100644 --- a/content/2.md +++ b/content/2.md @@ -11,7 +11,7 @@ RAID protects you against one and only one thing: a disk failure. It does _not_ protect you against any of the following things: -* Multiple disk failures beyond the RAID level chosen (e.g. both disks in a mirror, or 3 disks in a RAID-6), including possible [UREs](https://holtstrom.com/michael/blog/post/588/RAID-5-URE-Failures.html) - on that later subject, RAID-5 should be considered harmful these days for any disks larger than 1TB. +* Multiple disk failures beyond the RAID level chosen (e.g. both disks in a mirror, or 3 disks in a RAID-6), including possible [UREs](https://holtstrom.com/michael/blog/post/588/RAID-5-URE-Failures.html). * Failure of the RAID controller itself (especially when using hardware RAID), the computer running the RAID, or the environment containing the servers (a flood, fire, theft, etc.). * Data corruption on-disk from filesystem bugs, cosmic rays, or minor hardware or firmware failures, which can and do happen all the time - you usually just don't notice and software works around it. * Malicious or accidental deletion or modification of files by yourself or another party, including viruses, bad application writes, or administrative mistakes (e.g. `rm`-ing the wrong file or `mkfs` on an existing filesystem), which any seasoned sysadmin has done at least once (and hopefully not to production data)!