How DataSync Stores Files in Locations
How DataSync transfers and stores files depends on the file type and the location type. The following table shows how files are stored in each of the location types.
|
File Type |
NFS |
Amazon EFS |
Amazon S3 |
|---|---|---|---|
|
Regular |
Natively |
Natively |
Object |
|
Symbolic link |
Natively |
Natively |
Link content stored in object |
|
Directory |
Natively | Natively |
Empty object |
|
Block device |
Natively |
Not supported |
Empty object |
|
Character device |
Natively | Not supported | Empty object |
|
Named pipe |
Ignored |
Ignored | Ignored |
|
Socket |
Ignored | Ignored | Ignored |
The following table shows how metadata is transferred and stored in each location type.
|
POSIX Metadata |
NFS |
Amazon EFS |
Amazon S3 |
|---|---|---|---|
|
File type |
inode mode field |
inode mode field |
Object user-defined metadata file permissions The exception is directories that are indicated by a trailing */* in the object n. |
|
Permissions |
inode mode field | inode mode field | Object user-defined metadata file permissions |
|
User ID |
inode uid field | inode uid field | Object user-defined metadata file owner |
|
Group ID |
inode uid field | inode uid field | Object user-defined metadata file group |
|
Modification time |
inode Mtime field | inode Mtime field | Object user-defined metadata file Mtime |
|
Access time |
inode Atime field | inode Atime field | Object user-defined metadata file Atime |
|
Sticky/Setuid/Setgid |
inode mode field | inode mode field | Object user-defined metadata file permissions |
|
Device major/minor |
inode device id field |
Not supported |
Object user-defined metadata file device |
|
Hard links |
inode link cound field | inode link cound field | Object user-defined metadata file inode |
When transferring files from an Amazon S3 location to an Amazon EFS or NFS location, objects that don't have POSIX metadata assume the default UID, GID, folder, and file permissions. The following table shows the default permissions that DataSync assumes.
| Permission | Value |
|---|---|
|
UID |
65534 |
|
GID |
65534 |
|
Folder Permission |
0755 |
|
File Permission |
0755 |
