NAS with archive attribute support

[damai7788]

Dear All,

I'm migrating from Windows File Server to NAS.

In Windows File Server, I usually do the backup on weekly and daily basis.
I do complete backup every Friday night.
I do differential backup every night, so it only backup new files/changed files, this procedure rely on Archive attributes of the files.

Using Windows File Server, this backup procedure runs properly.

I've tried using 3 SOHO NAS, WD My World, Buffalo Live Station Single Disk, dan Buffalo Duo Dual Disk.
None of them can change the 'A' attribute properly.

Using Buffalo,
If UserA and UserBackup has full access to FolderA/FileA.
If UserA create the file, he can change the attribute.
But UserB who also has full access to FolderA/FileA cannot change the attribute.

Anybody has the same problem? Any solution?
Any other NAS can do this?

Thanks.
Anto

 

[stevech]

NASes I've used/read about don't have the "A"rchive attribute concept. Most seem to copy the whole file if it's new to that directory

changed portions if it was previously copied or the source file date-modified is younger

Some dumb ones copy the whole file only if the date is younger (or it doesn't exist on the target).

Others I've seen fail to preserve the date last modified and/or date create properly, esp. with the NAS using FAT32.

 

[claykin]

Do you have a domain controller? Are you running Active Directory?

NAS uses Linux and file permissions are not exactly preserved.

You can use AD and get a NAS that supports it. Also consider iSCSI and format the LUN NTFS.

The NAS products you tried are not professional. Look at Netgear Readynas Business (Pro series) or QNAP or Synology.

 

[damai7788]

NASes I've used/read about don't have the "A"rchive attribute concept. Most seem to copy the whole file if it's new to that directory

changed portions if it was previously copied or the source file date-modified is younger

Some dumb ones copy the whole file only if the date is younger (or it doesn't exist on the target).

Others I've seen fail to preserve the date last modified and/or date create properly, esp. with the NAS using FAT32.

IMO, using file comparison methode, instead of 'A' attribute, file comparison may take longer time. Btw, what is your favorite backup program?

for the backup processs, I use winrar which can manipulate 'A' attribute.
I backup to different file. Everytime it runs, it create different file, eg. 20110801full.rar, 20110802diff.rar, 20110803diff.rar.
So I can have multiple sets of backup.

before the backup process, I run a small program to make sure that is certain free space at the destination drive, it will delete the oldest existing rar to provide the free space.

Any backup program have this free space feature?

Thanks.

 

[damai7788]

Do you have a domain controller? Are you running Active Directory?

NAS uses Linux and file permissions are not exactly preserved.

You can use AD and get a NAS that supports it. Also consider iSCSI and format the LUN NTFS.

The NAS products you tried are not professional. Look at Netgear Readynas Business (Pro series) or QNAP or Synology.

I'm not using Active Directory, but I think the 'A' attribute is not related to AD.

Anybody have this Netgear/QNAP/Synology? Do they really support 'A' attribute with different user/owner?

Thanks.

 

[travisco_nabisco]

In the past I have used Synology devices to store data that was backed up usin BackupExec 12 and the 'A' attribute has worked correctly. That was in a configuration with an Active Directory Domain Server.

 

[teknojnky]

https://encrypted.google.com/#sclie...hp&q=linux archive bit&pbx=1&oq=linux archive

or

https://encrypted.google.com/#pq=li...cp=23&gs_id=o&xhr=t&q=linux+archive+bit+samba

to re-phrase and summarize;

there is essentially NO archive bit on linux

archive bit can be faked on samba via active directory permissions

 

[stevech]

? if a NAS compares the source file's modified-date and size to that of the youngest/only copy, why does one need a non-standard "archive" status bit? It's handy, but sort of proprietary. I suppose the archive bit simplifies the checking, but at some cost of interoperability among file system types.

 

[damai7788]

imho, I'm not sure the 'A' attributes is related to Active Directory.
SOHO Buffalo NAS almost can do it, but only the file creator can change it. Other user with full access permission cannot change the attribute.

Just looking for another NAS that can do this. SOHO NAS is preferred.

Using A attributes is something like server side based. We can do the (incremental/differential) backup from any PC.

Comparing file's date/size is something like client side based. It must maintain a list of last back up files. Every backup must be run from the same PC? It may took longer time for the comparing process.

In Linux world, what is the algorithm to do the incremental/differential backup?

Thanks.

 

[teknojnky]

In Linux world, what is the algorithm to do the incremental/differential backup?

generally linux backups often use some variation of...

cp: cp -vrup source destination
http://linux.about.com/od/commands/l/blcmdl1_cp.htm

rsync http://linux.about.com/library/cmd/blcmdl1_rsync.htm

or some shell script based on the above or other various linux utils.


https://encrypted.google.com/webhp?hl=en#hl=en&cp=10&gs_id=18&xhr=t&q=linux+backup