Scalability and performance targets for VM disks

Artikkel
08/22/2024

Applies to: ✔️ Linux VMs ✔️ Windows VMs ✔️ Flexible scale sets ✔️ Uniform scale sets

You can attach a number of data disks to an Azure virtual machine (VM). Based on the scalability and performance targets for a VM's data disks, you can determine the number and type of disk that you need to meet your performance and capacity requirements.

Important

For optimal performance, limit the number of highly utilized disks attached to the virtual machine to avoid possible throttling. If all attached disks aren't highly utilized at the same time, the virtual machine can support a larger number of disks. Additionally, when creating a managed disk from an existing managed disk, only 49 disks can be created concurrently. More disks can be created after some of the initial 49 have been created.

For Azure managed disks:

The following table illustrates the default and maximum limits of the number of resources per region per subscription. The limits remain the same irrespective of disks encrypted with either platform-managed keys or customer-managed keys. There is no limit for the number of Managed Disks, snapshots and images per resource group.

Resource Limit

Standard managed disks 50,000

Standard SSD managed disks 50,000

Premium SSD managed disks 50,000

Premium SSD v2 managed disks 1,000

Premium SSD v2 managed disks capacity² 32,768

Ultra disks 1,000

Ultra disk capacity² 32,768

Standard_LRS snapshots¹ 75,000

Standard_ZRS snapshots¹ 75,000

Managed image 50,000

Resource	Limit
Standard managed disks	50,000
Standard SSD managed disks	50,000
Premium SSD managed disks	50,000
Premium SSD v2 managed disks	1,000
Premium SSD v2 managed disks capacity²	32,768
Ultra disks	1,000
Ultra disk capacity²	32,768
Standard_LRS snapshots¹	75,000
Standard_ZRS snapshots¹	75,000
Managed image	50,000

¹An individual disk can have 500 incremental snapshots.

²This is the default max but higher capacities are supported by request. To request an increase in capacity, request a quota increase or contact Azure Support.

For standard storage accounts:

A Standard storage account has a maximum total request rate of 20,000 IOPS. The total IOPS across all of your virtual machine disks in a Standard storage account should not exceed this limit.

For unmanaged disks, you can roughly calculate the number of highly utilized disks supported by a single standard storage account based on the request rate limit. For example, for a Basic tier VM, the maximum number of highly utilized disks is about 66, which is 20,000/300 IOPS per disk. The maximum number of highly utilized disks for a Standard tier VM is about 40, which is 20,000/500 IOPS per disk.

For premium storage accounts:

A premium storage account has a maximum total throughput rate of 50 Gbps. The total throughput across all of your VM disks should not exceed this limit.

See VM sizes for more details.

Managed virtual machine disks

Standard HDD managed disks

Standard Disk Type	S4	S6	S10	S15	S20	S30	S40	S50	S60	S70	S80
Disk size in GiB	32	64	128	256	512	1,024	2,048	4,096	8,192	16,384	32,767
Base IOPS per disk	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 1,300	Up to 2,000	Up to 2,000
*Expanded IOPS per disk	N/A	N/A	N/A	N/A	N/A	Up to 1,500	Up to 3,000	Up to 3,000	Up to 3,000	Up to 3,000	Up to 3,000
Base throughput per disk	Up to 60 MB/s	Up to 60 MB/s	Up to 60 MB/s	Up to 60 MB/s	Up to 60 MB/s	Up to 60 MB/s	Up to 60 MB/s	Up to 60 MB/s	Up to 300 MB/s	Up to 500 MB/s	Up to 500 MB/s
*Expanded throughput per disk	N/A	N/A	N/A	N/A	N/A	Up to 150 MB/s	Up to 300 MB/s	Up to 500 MB/s	Up to 500 MB/s	Up to 500 MB/s	Up to 500 MB/s

* Only applies to disks with performance plus (preview) enabled.

Standard SSD managed disks

Standard SSD sizes	E1	E2	E3	E4	E6	E10	E15	E20	E30	E40	E50	E60	E70	E80
Disk size in GiB	4	8	16	32	64	128	256	512	1,024	2,048	4,096	8,192	16,384	32,767
Base IOPS per disk	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 500	Up to 2,000	Up to 4,000	Up to 6,000
*Expanded IOPS per disk	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	Up to 1,500	Up to 3,000	Up to 6,000	Up to 6,000	Up to 6,000	Up to 6,000
Base throughput per disk	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 100 MB/s	Up to 400 MB/s	Up to 600 MB/s	Up to 750 MB/s
*Expanded throughput per disk	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	Up to 150 MB/s	Up to 300 MB/s	Up to 600 MB/s	Up to 750 MB/s	Up to 750 MB/s	Up to 750 MB/s
Max burst IOPS per disk	600	600	600	600	600	600	600	600	1000
Max burst throughput per disk	150 MB/s	150 MB/s	150 MB/s	150 MB/s	150 MB/s	150 MB/s	150 MB/s	150 MB/s	250 MB/s
Max burst duration	30 min	30 min	30 min	30 min	30 min	30 min	30 min	30 min	30 min

* Only applies to disks with performance plus (preview) enabled.

Premium SSD managed disks: Per-disk limits

Premium SSD sizes	P1	P2	P3	P4	P6	P10	P15	P20	P30	P40	P50	P60	P70	P80
Disk size in GiB	4	8	16	32	64	128	256	512	1,024	2,048	4,096	8,192	16,384	32,767
Base provisioned IOPS per disk	120	120	120	120	240	500	1,100	2,300	5,000	7,500	7,500	16,000	18,000	20,000
**Expanded provisioned IOPS per disk	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	8,000	16,000	20,000	20,000	20,000	20,000
Base provisioned Throughput per disk	25 MB/s	25 MB/s	25 MB/s	25 MB/s	50 MB/s	100 MB/s	125 MB/s	150 MB/s	200 MB/s	250 MB/s	250 MB/s	500 MB/s	750 MB/s	900 MB/s
**Expanded provisioned throughput per disk	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	300 MB/s	600 MB/s	900 MB/s	900 MB/s	900 MB/s	900 MB/s
Max burst IOPS per disk	3,500	3,500	3,500	3,500	3,500	3,500	3,500	3,500	30,000*	30,000*	30,000*	30,000*	30,000*	30,000*
Max burst throughput per disk	170 MB/s	170 MB/s	170 MB/s	170 MB/s	170 MB/s	170 MB/s	170 MB/s	170 MB/s	1,000 MB/s*	1,000 MB/s*	1,000 MB/s*	1,000 MB/s*	1,000 MB/s*	1,000 MB/s*
Max burst duration	30 min	30 min	30 min	30 min	30 min	30 min	30 min	30 min	Unlimited*	Unlimited*	Unlimited*	Unlimited*	Unlimited*	Unlimited*
Eligible for reservation	No	No	No	No	No	No	No	No	Yes, up to one year	Yes, up to one year	Yes, up to one year	Yes, up to one year	Yes, up to one year	Yes, up to one year

*Applies only to disks with on-demand bursting enabled.
** Only applies to disks with performance plus (preview) enabled.

Premium SSD managed disks: Per-VM limits

Resource	Limit
Maximum IOPS Per VM	80,000 IOPS with GS5 VM
Maximum throughput per VM	2,000 MB/s with GS5 VM

Unmanaged virtual machine disks

Standard unmanaged virtual machine disks: Per-disk limits

VM tier	Basic tier VM	Standard tier VM
Disk size	4,095 GB	4,095 GB
Maximum 8-KB IOPS per persistent disk	300	500
Maximum number of disks that perform the maximum IOPS	66	40

Premium unmanaged virtual machine disks: Per-account limits

Resource	Limit
Total disk capacity per account	35 TB
Total snapshot capacity per account	10 TB
Maximum bandwidth per account (ingress + egress)¹	<=50 Gbps

¹Ingress refers to all data from requests that are sent to a storage account. Egress refers to all data from responses that are received from a storage account.

Premium unmanaged virtual machine disks: Per-disk limits

Premium storage disk type	P10	P20	P30	P40	P50
Disk size	128 GiB	512 GiB	1,024 GiB (1 TB)	2,048 GiB (2 TB)	4,095 GiB (4 TB)
Maximum IOPS per disk	500	2,300	5,000	7,500	7,500
Maximum throughput per disk	100 MB/sec	150 MB/sec	200 MB/sec	250 MB/sec	250 MB/sec
Maximum number of disks per storage account	280	70	35	17	8

Premium unmanaged virtual machine disks: Per-VM limits

Resource	Limit
Maximum IOPS per VM	80,000 IOPS with GS5 VM
Maximum throughput per VM	2,000 MB/sec with GS5 VM

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