# Azure Managed Disks

Sedai continuously rightsizes Azure Managed Disk tiers, reclaims unattached disks, and migrates to newer types — safety checks and snapshots included.

## Every Disk, Priced for What It Actually Does

Managed Disks are provisioned once and rarely revisited, leaving teams overpaying for performance tiers they don't need, exposed to bottlenecks when they under-provision, or paying for orphaned disks no one owns. Sedai continuously rightsizes tiers, reclaims unattached disks, and migrates to newer, more cost-effective disk types.

## Disk Costs Drift in Both Directions — and Nobody's Watching

Choosing a performance tier isn't a one-time decision, and getting it wrong doesn't fail loudly. Tier mismatches, deleted VMs that leave their disks behind, and disk types that go stale all quietly add up, with no natural trigger to catch them.

### Performance tiers get chosen once and assumed correct forever.

Premium SSDs are the default safety net for uncertain I/O needs, but that same instinct also produces the opposite failure: a tier too slow for the workload, causing latency and availability problems on the attached VM.

### Deleting a VM doesn't delete its disks.

Data disks routinely survive the VM they were attached to, continuing to accrue storage costs indefinitely with no compute workload — and often no clear owner — to flag them.

### Disk technology keeps improving, but migrations don't happen on their own.

Newer disk types like Premium SSD v2 frequently offer better performance at a lower price than their predecessors, but nothing prompts a team to revisit disks that were provisioned years earlier.

## How We Help

### Performance Tier Rightsizing

Sedai analyzes historical IOPS and throughput to move underused disks to lower-cost tiers, upgrade bottlenecked disks, and migrate to newer types like Premium SSD v2.

### Unattached Disk Cleanup

Sedai identifies orphaned disks with no attached VM and recommends deletion, with automatic snapshotting available first to protect against data loss.

### Safe, Automated Execution

Changes to disks on running VMs follow a safe sequence — safety checks, stop, apply, restart — handled automatically without manual intervention.

## Stop Paying for Disks You Don't Need — or Can't Use.

## Frequently Asked Questions

### How does Sedai decide whether a disk needs a higher or lower performance tier?

Sedai analyzes historical IOPS and throughput against the disk's provisioned limits. Disks that consistently run well under capacity are candidates for a lower-cost tier; disks that repeatedly hit their limits are flagged for an upgrade to eliminate bottlenecks.

### What happens to an unattached disk before Sedai recommends deleting it?

Sedai identifies disks with no attached VM and surfaces them for cleanup. You can configure Sedai to automatically snapshot a disk before termination, so the data remains recoverable even after the disk itself is removed.

### Does optimizing a disk require taking down the VM it's attached to?

Yes, for disks attached to a running VM. Sedai runs safety checks, stops the VM, applies the configuration change, and restarts it, handling the full sequence automatically so no manual intervention is required.

### What does Sedai mean by "modernization" recommendations?

When a newer disk type offers better performance at a lower cost than what's currently provisioned, such as Premium SSD v2 versus v1, Sedai identifies the opportunity and recommends migrating.

### Can I review disk changes before they're applied?

Yes. As with other Sedai optimizations, Copilot mode is available for teams that want to approve recommendations before any change is executed.