Disk types and SLA

The "Disk" concept on the MCS platform is analogous to a physical storage medium such as an HDD or SSD.

A disk is a network block device that provides data storage for instances. All disks on the MCS Platform are networked and reliably protected by data replication, ensuring storage reliability and fault tolerance.

Benefits of network drives:

Flexibility : Disks are independent resources, so they can be moved between instances in the same datacenter, and you can expand the size of the disk without shutting down the instance to which it is connected.

Simplicity : Disks function as general purpose block devices, so you can think of attached drives as locally attached drives. This allows you to partition, format, and manage disks using familiar tools and techniques.

Application : the disk is an independent element of the project and can exist separately from the instance. This is useful when you need to resize the disk regardless of the virtual machine configuration.

Fault Tolerance : Disks provide reliable data storage and allow continuous read and write operations even if multiple physical disks fail

Attention

The created disk takes up space in the shared storage, so its availability is paid for separately, even if it is disconnected from the instance.

Disc types

Network drives differ by type and location:

Accommodation	A type	Description
ms1	HDD	Basic disk located in the DataLine NORD4 data center
dp1	HDD	Basic disk located in DataPro datacenter
ceph	HDD	Basic disk whose data is replicated between available data centers
ssd	SSD	Standard disk whose data is replicated between available datacenters
dp1-ssd	SSD	Standard disk located in DataPro data center
ko1-ssd	SSD	Standard disk located in the DataLine NORD4 data center
dp1-high-iops	High-IOPS SSD	Fast disk located in DataPro data center
ko1-high-iops	High-IOPS SSD	Fast disk located in the DataLine NORD4 data center
low-latency	NVME	Super fast disk with minimal latency (up to 0.5ms), available only on high-frequency VM configurations upon request to technical support .

Attention

To avoid potential performance degradation, it is recommended that you select an Availability Zone that matches your current instance when creating a disk that is attached to an existing instance.

SLA

For each type of disk, there is a performance limit that is required to guarantee the stability of the disk regardless of its type or size.

HDD

Size in GB	Block size	Reading		Block size	Recording
Size in GB	Block size	IOPS	MB / s	Block size	IOPS	MB / s
ten	4K	300	1	4K	150	1
	64K		nine	64K		five
	1M		38	1M		19
50	4K	300	1	4K	150	1
	64K		nine	64K		five
	1M		38	1M		19
100	4K	300	1	4K	150	1
	64K		nine	64K		five
	1M		38	1M		19
250	4K	300	1	4K	250	1
	64K		nine	64K		8
	1M		38	1M		31
500	4K	500	2	4K	500	2
	64K		sixteen	64K		sixteen
	1M		63	1M		63
1000	4K	1000	4	4K	800	3
	64K		31	64K		25
	1M		125	1M		100
1500	4K	1500	6	4K	800	3
	64K		47	64K		25
	1M		188	1M		100
2000	4K	2000	8	4K	800	3
	64K		63	64K		25
	1M		250	1M		100

SSD

Size in GB	Block size	Reading		Block size	Recording
Size in GB	Block size	IOPS	MB / s	Block size	IOPS	MB / s
ten	4K	1000	4	4K	500	2
	64K		31	64K		sixteen
	1M		125	1M		63
50	4K	1500	6	4K	750	3
	64K		47	64K		23
	1M		188	1M		94
100	4K	3000	12	4K	1500	6
	64K		94	64K		47
	1M		375	1M		188
250	4K	7500	29	4K	3750	fifteen
	64K		234	64K		117
	1M		400	1M		400
500	4K	15000	59	4K	7500	29
	64K		400	64K		234
	1M		400	1M		400
1000	4K	16000	63	4K	8000	31
	64K		400	64K		250
	1M		400	1M		400
1500	4K	16000	63	4K	8000	31
	64K		400	64K		250
	1M		400	1M		400
2000	4K	16000	63	4K	8000	31
	64K		400	64K		250
	1M		400	1M		400

High-IOPS SSD

Size in GB	Block size	Reading		Block size	Recording
Size in GB	Block size	IOPS	MB / s	Block size	IOPS	MB / s
ten	4K	10000	39	4K	5000	20
	64K		313	64K		156
	1M		500	1M		500
50	4K	10000	39	4K	5000	20
	64K		313	64K		156
	1M		500	1M		500
100	4K	10000	39	4K	5000	20
	64K		313	64K		156
	1M		500	1M		500
250	4K	10000	39	4K	6250	24
	64K		313	64K		195
	1M		500	1M		500
500	4K	15000	59	4K	12500	49
	64K		469	64K		391
	1M		500	1M		500
1000	4K	30,000	117	4K	25000	98
	64K		500	64K		500
	1M		500	1M		500
1500	4K	45000	176	4K	30,000	117
	64K		500	64K		500
	1M		500	1M		500
2000	4K	45000	176	4K	30,000	117
	64K		500	64K		500
	1M		500	1M		500

Low latency

Size in GB	Block size	Reading		Block size	Recording
Size in GB	Block size	IOPS	MB / s	Block size	IOPS	MB / s
ten	4K	1000	4	4K	500	2
	64K		31	64K		sixteen
	1M		125	1M		63
50	4K	1500	6	4K	750	3
	64K		47	64K		23
	1M		188	1M		94
100	4K	3000	12	4K	1500	6
	64K		94	64K		47
	1M		375	1M		188
250	4K	7500	29	4K	3750	fifteen
	64K		234	64K		117
	1M		400	1M		400
500	4K	15000	59	4K	7500	29
	64K		400	64K		234
	1M		400	1M		400
1000	4K	16000	63	4K	8000	31
	64K		400	64K		250
	1M		400	1M		400
1500	4K	16000	63	4K	8000	31
	64K		400	64K		250
	1M		400	1M		400
2000	4K	16000	63	4K	8000	31
	64K		400	64K		250
	1M		400	1M		400

Note

Disk performance directly depends on its size. If you need to increase the processing speed, sometimes it is enough to increase the size of the required disk.

How to test

For Windows

You can use DiskSPD or Fio software to measure read / write IOPS.

DiskSPD

DiskPSD is an official testing tool recommended by Microsoft and included in the developer repositories . The following steps are required to complete testing:

Download the utility from the official resource and unpack it to a convenient place: https://github.com/microsoft/diskspd/releases/latest
Run command line as administrator and go to the directory with the unpacked utility DiskSpd-2.0.21a \ amd64 \

Pre-create an empty file with a size of at least 10GB:

 fsutil file createnew C: \ temp \ test.bin 10485760000

To execute tests, you must use the command corresponding to the test type:

Random Write Test:

 diskspd -Suw -b4K -o1 -t32 -r -w100 C: \ temp \ test.bin> C: \ temp \ random_write_results.txt

Random read test:

 diskspd -Suw -b4K -o1 -t32 -r -w0 C: \ temp \ test.bin> C: \ temp \ random_read_results.txt

Fio

IOPS measurements using fio are performed using the rate_iops parameter. Tests are performed with values:

--rw (randread or randwrite)
--filename (name of the device under test)
--iodepth (8, 16, 32 or 64)

Download and install Fio from the official resource: https://bsdio.com/fio/

Command to run the test:

 fio --name = randwrite --iodepth = 32 --rw = randwrite --bs = 4k --direct = 1 --size = 10G --numjobs = 1 --runtime = 240 --group_reporting --filename = C: \ Users \ ADMIN \ test

Note

The mechanics of Fio are different from the DiskSPD tool. The Fio records in 2 files, so the measurement results may be different for both instruments. Nevertheless, Microsoft Corporation trusts its tool and recommends using DiskSPD on Windows operating systems.

For Linux

The read / write IOPS measurements are performed by the fio software and the rate_iops parameter. Tests are performed with values:

--rw (randread or randwrite)
--filename (name of the device under test)
--iodepth (8, 16, 32 or 64)

Installing Fio:

 sudo apt install fio

Command to run the test:

 fio --name = randwrite --ioengine = libaio --iodepth = 32 --rw = randwrite --bs = 4k --direct = 1 --size = 512M --numjobs = 1 --runtime = 240 --group_reporting - -filename = / home / user / test

Measurement results:

read: IOPS
write: IOPS

Types of testing performed	Test result (Number of IOPS)
Read / Write in 4 KB blocks in 32 threads	According to SLA values
Read / Write in 8 KB blocks in 32 threads	at least 75% of the SLA
Read / Write 16KB in 32 Streams	at least 50% of the SLA

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Disk types and SLA

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