[Bug 1356392] Re: lacks sw raid1 install support

[LaMont Jones]

Following up on a discussion from today with more detail.

For metal in the datacenters, everything that can be RAID, is.  The
driving reason for this is to avoid a disk failure resulting in machine
downtime.  Given the number of drives in a modern datacenter, it's not a
question of "if a drive fails", but rather "how many drive failures did
we have this last week or two?".

In almost all cases, we have hardware RAID controllers, and this reality
is hidden from the operating system.  In cases where we don't have a
card (blades being today's example), we use software RAID (allowing
operation with a degraded RAID) to achieve the same result.

Generally speaking, we use RAID1, with RAID 5 when the drives aren't big
enough and performance is less critical, RAID 10 where performance is
critical (and the individual drives are too small for the job).

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to curtin in Ubuntu.
https://bugs.launchpad.net/bugs/1356392

Title:
  lacks sw raid1 install support

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/curtin/+bug/1356392/+subscriptions