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Visible ISCSI LUN

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Visible ISCSI LUN

Postby ddaniel51 » Wed Apr 28, 2021 8:47 am

The current condition of ADM is that ISCSI LUN objects are invisible in the system to Backup utilities and file explorers.
I have found posts going back at least 4 years of customers asking for help with this problem only to be totally ignored by Asustor.

Please make ISCSI LUNs visible as an object for Rsync or FTP backup and file explorers.

Is this beyond Asustor's technical abilities or does Asustor just not care?

I have spent $5000 on 7 series Nas's so far and expect some support before finding a company who can do this.
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Re: Visible ISCSI LUN

Postby ilike2burnthing » Wed Apr 28, 2021 10:29 am

Tried contacting support about it? This is a community forum, users helping other users, there's little to no official Asustor presence here.
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Re: Visible ISCSI LUN

Postby matrox » Thu Apr 29, 2021 3:22 pm

if your iscsi clients linux like system ( non windows) then, you can try to
1. connect the iscsi lun manually to the nas itself via shell:
a. /usr/builtin/sbin/iscsiadm -m discovery -t st -p localhost
b. /usr/builtin/sbin/iscsiadm -m node -p localhost -L all
c. create fs via mkfs on /dev/sdX ( see correct disc name in dmesg)
2. create folder in adm\access control\shared folders ( it create folder in /voume1/*)
3. via shell use "mount /dev/sdX1 /volume01/folder1
where folder1 - created folder in step 2 ( in my case /volume1/backup01)
3. now you see iscsi lun data in folder1 and can see it from file explorer

before trying make backup.
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Re: Visible ISCSI LUN

Postby core » Sun May 30, 2021 2:51 pm

@matrox that is very interesting.

But, I think with iSCSI client side caching, any backup you make that is not coordinated at a lower level with the iSCSI protocol could give you inconsistent backups.
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Re: Visible ISCSI LUN

Postby father.mande » Sun May 30, 2021 6:18 pm

Hi,

Based on my (even old) experience, I think that a "sync" then a flush of cache "echo 3 > /proc/sys/vm/drop_caches" (3 is for pagecache, dentries, inode ... 2 for dentries & inode and 1 pagecache only are for more limited ) is a possibility to flush the file system ...

doing this flush file and also free memory, even new access to any file system require to access the storage and not only the memory. (if cached)

You can also force sync at mount ... (if file system in the iscsi target support this option)

Philippe.
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