First, the NVMe device names used by Linux based operating systems will be different than the parameters for EBS volume attachment requests and block device mapping entries such as /dev/xvda and /dev/xvdf. NVMe devices are enumerated by the operating system as /dev/nvme0n1, /dev/nvme1n1, and so on. The NVMe device names are not persistent mappings to volumes, therefore other methods like file system UUIDs or labels should be used when configuring the automatic mounting of file systems or other startup activities. When EBS volumes are accessed via the NVMe interface, the EBS volume ID is available via the controller serial number and the device name specified in EC2 API requests is provided by an NVMe vendor extension to the Identify Controller command. This enables backward compatible symbolic links to be created by a utility script. For more information see the EC2 documentation on device naming and NVMe based EBS volumes.
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Third, the NVMe interface can transfer much larger amounts of data per I/O, and in some cases may be able to support more outstanding I/O requests, compared to the Xen PV block interface. This can cause higher I/O latency if very large I/Os or a large number of I/O requests are issued to volumes designed to support throughput workloads like EBS Throughput Optimized HDD (st1) and Cold HDD (sc1) volumes. This I/O latency is normal for throughput optimized volumes in these scenarios, but may cause I/O timeouts in NVMe drivers. The I/O timeout can be adjusted in the Linux driver by specifying a larger value for the nvme_core.io_timeout kernel module parameter.
*SpencerLab Sept 2021 study of printer inks sold in North America commissioned by HP for on-average performance of 16 brands of non-HP refill, remanufactured, and imitation cartridges vs. Original HP Ink SKUs 952XL, 63XL, 902XL, 950XL, 951XL. To account for reliability-driven supplies issues, defective and failed cartridges were included in the page yield calculations. Consequently, the reported page yield numbers are not based on ISO/IEC 24711 standard methodology, as it requires defective supplies be excluded from page yield calculation. See -NA-2021.pdf
Cisco Meraki licensing is applied on an organization-wide basis. This means that a license isn't purchased for a specific serial number or device, rather each license added to the organization increases the number of a specific device type (the license limit) that can be added to networks within the organization. 2ff7e9595c
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