Notes and Constraints

**Table 1** SFS Turbo restrictions
Item	Standard, Standard-Enhanced (Discontinued), Performance, and Performance-Enhanced (Discontinued)	20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 MB/s/TiB
Access method	VPN, Direct Connect, and Cloud Connect	VPN, Direct Connect, and Cloud Connect
Max. bandwidth	Standard: 150 MB/s Standard-Enhanced (Discontinued): 1 GB/s Performance: 350 MB/s Performance-Enhanced (Discontinued): 2 GB/s	20 MB/s/TiB and 40 MB/s/TiB: 8 GB/s (If you need a higher throughput, submit a service ticket. The maximum throughput is 20 GB/s.) 125 MB/s/TiB and 250 MB/s/TiB: 20 GB/s (If you need a higher throughput, submit a service ticket. The maximum throughput is 100 GB/s.) 500 MB/s/TiB and 1,000 MB/s/TiB: 80 GB/s (If you need a higher throughput, submit a service ticket. The maximum throughput is 200 GB/s.)
Max. IOPS	Standard: 5,000 Standard-Enhanced (Discontinued): 15,000 Performance: 20,000 Performance-Enhanced (Discontinued): 100,000	20 MB/s/TiB and 40 MB/s/TiB: 250,000 125 MB/s/TiB and 250 MB/s/TiB: 1 million 500 MB/s/TiB and 1,000 MB/s/TiB: 4 million (If you need a higher IOPS, submit a service ticket. The maximum IOPS is 10 million.)
Min. latency	1–2 ms	1–2 ms
Max. capacity of a file system	320 TB	1 PB
Supported protocol	NFSv3	NFSv3
Max. number of clients that a file system allows	500	3,000
Max. number of authorized VPCs per file system	20	20
Max. size of a single file	16 TB	320 TB
Max. number of files or subdirectories per file system	1 billion NOTE: The number of files or subdirectories allowed in a single file system is calculated by dividing the total capacity (KB) by 16. If the calculated value is greater than 1 billion, the number of files or subdirectories allowed is 1 billion.	2 billion NOTE: The number of files or subdirectories allowed in a single file system is calculated by dividing the total capacity (GB) by 25,000. If the calculated value is greater than 2 billion, the number of files or subdirectories allowed is 2 billion.
Max. number of files or subdirectories in a single directory	20 million NOTE: If you need to execute the ls, du, cp, chmod, or chown command on a directory, you are advised to place no more than 500,000 files or subdirectories in that directory. Otherwise, requests may queue for a long time as the NFS protocol needs to send a large number of requests to traverse files in the directory.	20 million NOTE: If you need to execute the ls, du, cp, chmod, or chown command on a directory, you are advised to place no more than 500,000 files or subdirectories in that directory. Otherwise, requests may queue for a long time as the NFS protocol needs to send a large number of requests to traverse files in the directory.
Max. directory depth (unit: level)	100	100
Max. path length (unit: byte)	1,024	4,096
Max. soft link length (unit: byte)	1,024	1,024
Max. hard link length (unit: byte)	255	255
Max. number of file systems	32 by default. You can submit a service ticket to increase the quota.	32 by default. You can submit a service ticket to increase the quota.
Backup	Supported	Supported
File locking with Flock	Not supported	Not supported
Cache acceleration	Not supported	Supported. (Eventual consistency only. To disable cache acceleration, submit a service ticket.) NOTE: When multiple clients access the same file system, access requests of a client may be routed to different backends. If a request hits a backend's local cache, it will fail to obtain the modifications made by other clients. Cache is normally valid for 3 to 30 seconds.
Tag	You can add a maximum of 10 tags to a file system. Tag keys of a file system must be unique.