Skip to content

Apply optimal drive settings for Ultrastar DC SN681 #9263

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Oct 23, 2025
Merged

Apply optimal drive settings for Ultrastar DC SN681 #9263

Changes from 1 commit
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
64103ed
[jj-spr] initial version
papertigers Oct 20, 2025
599d43c
only apply settings if we are running on an oxide sled
papertigers Oct 20, 2025
d79cadb
fix typo
papertigers Oct 23, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
228 changes: 133 additions & 95 deletions sled-hardware/src/illumos/partitions.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -26,11 +26,16 @@ static DEFAULT_NVME_LBA_DATA_SIZE: u64 = 4096;
/// NVMe device settings for a particular NVMe model.
struct NvmeDeviceSettings {
/// The desired disk size for dealing with overprovisioning.
size: u32,
resize: NvmeVendorResize,
/// An override for the default 4k LBA formatting.
lba_data_size_override: Option<u64>,
}

enum NvmeVendorResize {
Wdc(u32),
Unsupported,
}

/// A mapping from model to desired settings.
/// A device not found in this lookup table will not be modified by sled-agent.
static PREFERRED_NVME_DEVICE_SETTINGS: OnceLock<
Expand All @@ -43,23 +48,45 @@ fn preferred_nvme_device_settings()
HashMap::from([
(
"WUS4C6432DSP3X3",
NvmeDeviceSettings { size: 3200, lba_data_size_override: None },
NvmeDeviceSettings {
resize: NvmeVendorResize::Wdc(3200),
lba_data_size_override: None,
},
),
(
"WUS5EA138ESP7E1",
NvmeDeviceSettings { size: 3200, lba_data_size_override: None },
NvmeDeviceSettings {
resize: NvmeVendorResize::Wdc(3200),
lba_data_size_override: None,
},
),
(
"WUS5EA138ESP7E3",
NvmeDeviceSettings { size: 3200, lba_data_size_override: None },
NvmeDeviceSettings {
resize: NvmeVendorResize::Wdc(3200),
lba_data_size_override: None,
},
),
(
"WUS5EA176ESP7E1",
NvmeDeviceSettings { size: 6400, lba_data_size_override: None },
NvmeDeviceSettings {
resize: NvmeVendorResize::Wdc(6400),
lba_data_size_override: None,
},
),
(
"WUS5EA176ESP7E3",
NvmeDeviceSettings { size: 6400, lba_data_size_override: None },
NvmeDeviceSettings {
resize: NvmeVendorResize::Wdc(6400),
lba_data_size_override: None,
},
),
(
"SDS6BA138PSP9X3",
NvmeDeviceSettings {
resize: NvmeVendorResize::Unsupported,
lba_data_size_override: None,
},
),
])
})
Expand Down Expand Up @@ -268,100 +295,111 @@ fn ensure_size_and_formatting(
use libnvme::namespace::NamespaceDiscoveryLevel;

let mut controller_found = false;

if let Some(nvme_settings) =
preferred_nvme_device_settings().get(identity.model.as_str())
{
let nvme = Nvme::new()?;
for controller in nvme.controller_discovery()? {
let controller = controller?.write_lock().map_err(|(_, e)| e)?;
let controller_info = controller.get_info()?;
// Make sure we are operating on the correct NVMe device.
if controller_info.serial() != identity.serial {
continue;
};
controller_found = true;
let nsdisc = controller
.namespace_discovery(NamespaceDiscoveryLevel::Active)?;
let namespaces =
nsdisc.into_iter().collect::<Result<Vec<_>, _>>()?;
if namespaces.len() != 1 {
return Err(NvmeFormattingError::UnexpectedNamespaces(
namespaces.len(),
));
}
// Safe because verified there is exactly one namespace.
let namespace = namespaces.into_iter().next().unwrap();

// NB: Only some vendors such as WDC support adjusting the size
// of the disk to deal with overprovisioning. This will need to be
// abstracted away if/when we ever start using another vendor with
// this capability.
let size = controller.wdc_resize_get()?;

// First we need to detach blkdev from the namespace.
namespace.blkdev_detach()?;

// Resize the device if needed to ensure we get the expected
// durability level in terms of drive writes per day.
if size != nvme_settings.size {
controller.wdc_resize_set(nvme_settings.size)?;
info!(
log,
"Resized {} from {size} to {}",
identity.serial,
nvme_settings.size
)
let nvme = Nvme::new()?;

for controller in nvme.controller_discovery()? {
let controller = controller?.write_lock().map_err(|(_, e)| e)?;
let controller_info = controller.get_info()?;

// Make sure we are operating on the correct NVMe device.
if controller_info.serial() != identity.serial {
continue;
};
controller_found = true;
let nsdisc =
controller.namespace_discovery(NamespaceDiscoveryLevel::Active)?;
let namespaces = nsdisc.into_iter().collect::<Result<Vec<_>, _>>()?;
if namespaces.len() != 1 {
return Err(NvmeFormattingError::UnexpectedNamespaces(
namespaces.len(),
));
}
// Safe because verified there is exactly one namespace.
let namespace = namespaces.into_iter().next().unwrap();

// First we need to detach blkdev from the namespace.
namespace.blkdev_detach()?;

// Check for a known nvme drive and apply our desired configuration.
let mut wanted_data_size = DEFAULT_NVME_LBA_DATA_SIZE;
if let Some(nvme_settings) =
preferred_nvme_device_settings().get(identity.model.as_str())
{
match nvme_settings.resize {
NvmeVendorResize::Wdc(provisioning_size) => {
let size = controller.wdc_resize_get()?;

// Resize the device if needed to ensure we get the expected
// durability level in terms of drive writes per day.
if size != provisioning_size {
controller.wdc_resize_set(provisioning_size)?;
info!(
log,
"Resized {} from {size} to {provisioning_size}",
identity.serial,
)
}
}
// This device doesn't have a vendor specific resize command to
// deal with overprovisioning so there's nothing to do.
NvmeVendorResize::Unsupported => (),
}

// Find the LBA format we want to use for the device.
let wanted_data_size = nvme_settings
.lba_data_size_override
.unwrap_or(DEFAULT_NVME_LBA_DATA_SIZE);
let desired_lba = controller_info
.lba_formats()
.collect::<Result<Vec<_>, _>>()?
.into_iter()
.find(|lba| {
lba.meta_size() == NVME_LBA_META_SIZE
&& lba.data_size() == wanted_data_size
})
.ok_or_else(|| NvmeFormattingError::LbaFormatMissing)?;

// If the controller isn't formatted to our desired LBA we need to
// issue a format request.
let ns_info = namespace.get_info()?;
let current_lba = ns_info.current_format()?;
if current_lba.id() != desired_lba.id() {
controller
.format_request()?
.set_lbaf(desired_lba.id())?
// TODO map this to libnvme::BROADCAST_NAMESPACE once added
.set_nsid(u32::MAX)?
// No secure erase
.set_ses(0)?
.execute()?;

info!(
log,
"Formatted disk with serial {} to an LBA with data size \
{wanted_data_size}",
identity.serial,
);
if let Some(lba_data_size_override) =
nvme_settings.lba_data_size_override
{
wanted_data_size = lba_data_size_override;
}
} else {
info!(
log,
"There are no preferred NVMe settings for disk model {}; will \
attempt to format to the default LBA data size for disk with \
serial {}",
identity.model,
identity.serial
);
}

// Attach blkdev to the namespace again
namespace.blkdev_attach()?;
// Find the LBA format we want to use for the device.
let desired_lba = controller_info
.lba_formats()
.collect::<Result<Vec<_>, _>>()?
.into_iter()
.find(|lba| {
lba.meta_size() == NVME_LBA_META_SIZE
&& lba.data_size() == wanted_data_size
})
.ok_or_else(|| NvmeFormattingError::LbaFormatMissing)?;

// If the controller isn't formatted to our desired LBA we need to
// issue a format request.
let ns_info = namespace.get_info()?;
let current_lba = ns_info.current_format()?;
if current_lba.id() != desired_lba.id() {
controller
.format_request()?
.set_lbaf(desired_lba.id())?
// TODO map this to libnvme::BROADCAST_NAMESPACE once added
.set_nsid(u32::MAX)?
// No secure erase
.set_ses(0)?
.execute()?;

info!(
log,
"Formatted disk with serial {} to an LBA with data size \
{wanted_data_size}",
identity.serial,
);
}
} else {
info!(
log,
"There are no preferred NVMe settings for disk model {}; nothing to\
do for disk with serial {}",
identity.model,
identity.serial
);
return Ok(());

// Attach blkdev to the namespace again
namespace.blkdev_attach()?;

// We found the disk and applied the settings so there's no use scanning
// the rest of the devices.
break;
}

if !controller_found {
Expand Down
Loading