Diff for /wikisrc/tutorials/how_to_use_iscsi_to_support_an_apple_time_machine.mdwn between versions 1.4 and 1.5

version 1.4, 2019/04/15 13:38:38 version 1.5, 2019/04/15 13:45:25
Line 101  Once this is completed, the disk is a no Line 101  Once this is completed, the disk is a no
   
 A sparse file is a special file-type which reports its 'size' in ls -l as the total it could be, if it was fully populated. However, until actual file blocks at given offsets are written, they aren't there: its a linked list. This permits a very fast growable file to a limit, but at some risk: if you accidentally touch it the wrong way, it fills in the holes. You just have to be careful. FTP for instance, doesn't honour sparse files. if you copy a file with FTP, the holes are filled in.   A sparse file is a special file-type which reports its 'size' in ls -l as the total it could be, if it was fully populated. However, until actual file blocks at given offsets are written, they aren't there: its a linked list. This permits a very fast growable file to a limit, but at some risk: if you accidentally touch it the wrong way, it fills in the holes. You just have to be careful. FTP for instance, doesn't honour sparse files. if you copy a file with FTP, the holes are filled in. 
   
 Sparse files were implemented in UNIX FFS a long time ago, and are in HFS+ as well. The behaviour of the tools like pax, rsync, tar, ftp has to be verified on a case-by-case basis. Its not clear if NetBSD [!template id=man name="pax" section="1"]] is safe or not. [rsync](http://pkgsrc.se/net/rsync) has the -S flag to preserve sparse files.   Sparse files were implemented in UNIX FFS a long time ago, and are in HFS+ as well. The behaviour of the tools like pax, rsync, tar, ftp has to be verified on a case-by-case basis. Its not clear if NetBSD [[!template id=man name="pax" section="1"]] is safe or not. [rsync](http://pkgsrc.se/net/rsync) has the -S flag to preserve sparse files. 
   

Removed from v.1.4  
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  Added in v.1.5


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