The Tool Desk
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Decide what the streaming workload actually needs
Check the filesystem and the cloud disk separately. On Linux, df -h shows filesystem capacity and free space, but it does not by itself establish whether the attached disk is the bottleneck. Also inspect the VM’s attached disks and the provider’s storage metrics. Work out whether the stream writes a growing recording or cache, reads media from that same volume, or gets media from another service. The title alone does not identify a streaming protocol or a required capacity.
If the filesystem is nearly full, more capacity may help. If the problem is slow reads or writes, high IOPS, latency, multi-machine access, or long-term retention, a larger local block disk may be the wrong fix. Google Cloud’s guidance distinguishes block, file, and object storage: block volumes suit workloads that expect a disk device; managed file storage can serve files to multiple machines using supported protocols; object storage exposes objects through APIs and can suit retained media or archives. Moving to file or object storage changes how the application accesses data, rather than simply enlarging a disk. See Google Cloud’s disk type guidance and storage strategy guide.
- Capacity: Estimate current use, growth, and how long recordings or source media must be retained.
- Performance: Check throughput, IOPS, latency, and whether the VM itself is limiting storage performance. Google Cloud says Persistent Disk performance depends on provisioned capacity, while Hyperdisk performance can be configured independently of capacity; availability and limits vary by disk type and VM series.
- Durability: Decide whether data must survive VM stop, restart, suspension, crash, or failure. Google identifies Local SSD as temporary storage; it is not a safe home for irreplaceable recordings.
- Access model: Confirm whether the software requires a block device, shared filesystem, or object-storage API.
- Operations and cost: Check attachment limits, replication and availability needs, recurring charges, and whether the chosen disk can later be reduced.
Safely expand the disk and filesystem
- Inventory the setup. Record the cloud provider, VM type, disk name and type, region or zone, current and target capacity, OS, partition table, filesystem, and whether the volume is the boot disk or a data disk. Confirm current provider limits and attachment compatibility before choosing a size.
- Prepare recovery. Check that backups, snapshots, and recovery procedures are current. Google recommends taking a disk snapshot before partition or filesystem changes. Its Persistent Disk guidance says increasing disk size does not itself delete or modify existing disk data, but that is not a substitute for a recovery plan.
- Enlarge the provider-managed disk. Use the provider’s console, CLI, API, or infrastructure-as-code workflow and follow its current instructions for the disk type and online/offline conditions. For Google Persistent Disk, the volume can be enlarged whether or not it is attached to a running VM; Google states that a disk cannot later be reduced. See Google’s resize procedure.
- Check what the guest OS sees. Inspect the device and determine whether the OS has recognized the larger volume. Rescan the device if the provider’s instructions call for it. Do not assume every OS, image, or data disk will update automatically.
- Extend the partition and filesystem or volume manager. Follow the exact instructions for your OS, partition table, filesystem, and storage layout. Google says most boot disks automatically resize the root filesystem, but some images and resized data disks require manual steps. Azure’s Windows process distinguishes enlarging the managed disk from growing the Windows volume. IBM’s Classic block-storage instructions call for a host rescan followed by partition and filesystem expansion. Use the appropriate official guide rather than copying a command from a different provider or OS: Azure Windows VM disk expansion or IBM Classic volume expansion.
- Verify both layers. Confirm that the provider reports the new disk capacity and that the guest OS reports the expected filesystem size and free space. Then observe the streaming process and storage metrics in your own environment. The cited infrastructure procedures do not establish performance or uptime for a particular streaming workload.
- Review the bill and recovery options. Check the new recurring storage cost and confirm the volume still fits your performance needs. IBM’s Classic block-volume documentation says an expansion is prorated and the allocation cannot subsequently be reduced. Google also says Persistent Disk cannot be shrunk. Check current provider billing and product terms for your account.
Provider-specific limits and exceptions
Google Cloud Persistent Disk
Google’s Persistent Disk documentation lists a maximum of 64 TiB per volume. It lists up to 257 TiB of total attached Persistent Disk capacity and up to 128 volumes for most VMs; shared-core machine types have lower limits of 3 TiB total and 16 volumes. These are Google-specific limits, not general cloud-server limits. Google’s storage architecture documentation points readers to current specifications for newer offerings, so verify live limits for the disk type and VM series you intend to use. See Google’s Persistent Disk documentation.
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Check whether the VM uses Storage Spaces Direct before resizing underlying Persistent Disks. Google warns that Storage Spaces Direct does not recognize space added by resizing those disks and that data might become inaccessible; its prescribed direction is to add servers or drives instead. Review the Google disk-full and resize troubleshooting guide for this exception.
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Google Cloud identifies Local SSD as temporary: its data can be lost when a VM stops, suspends, restarts, crashes, or fails. Use it only for data that can safely be regenerated, such as scratch files or a cache. Choose durable storage for recordings and media that must survive VM lifecycle events. Google describes these options in its disk type documentation.
Troubleshoot when the new space does not appear
- The provider disk is larger, but
df -hshows the old size. The guest may not have rescanned the device, or the partition, logical volume, or filesystem may still need to be extended. Check each layer and follow the OS- and filesystem-specific provider instructions. - The disk is larger, but free space barely changed. Confirm which filesystem the streaming process writes to. The new capacity may belong to a different mounted volume, or the full space may be in another partition or filesystem.
- The filesystem has room, but the stream still stalls. Capacity and performance are different problems. Check throughput, IOPS, latency, VM limits, and whether the selected disk type suits the access pattern. A larger Persistent Disk can affect performance under Google’s documented model, but resizing alone is not proof that the streaming bottleneck is resolved.
- A shared-storage configuration behaves unexpectedly. Identify whether Storage Spaces Direct or another volume manager controls the space before making a change. Google specifically warns about resizing Persistent Disks under Storage Spaces Direct.
- Data disappears after a VM lifecycle event. Check whether the files were on ephemeral storage such as Local SSD. Move data that must persist to a durable storage option and restore from backup if needed.
- The new size costs more than expected or cannot be undone. Verify recurring billing and the provider’s shrink policy before expanding. Google Persistent Disk and IBM Classic block-volume documentation state that their expanded allocations cannot be reduced.
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