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Forum Discussion
Vmware ISCSI Disconnecting
Good Afternoon, I have a standalone vanilla ESX host 10.0.3.5 connecting directly via ISCSI to Netgear NVX storage 10.0.3.1. (Seperate network) I just can't make the ISCSI connection stable, it...
I would suggest you open a tech support case (see Online Submission link in my sig) and post your case number (preferably editing the title of the thread i.e. the title of the first post). Between tech support and the forum you should get good help to discover the cause of your problem.
Please don't use Cat5 cabling. That's old junk unless you're not interested in using gigabit ethernet. Cat5e is the oldest ethernet cable you should consider using.
An MTU of 9000 sounds like what you'd have with Jumbo Frames on, not off. An MTU of 1500 sounds more like what one would expect with Jumbo Frames disabled.
Edit: You're using 4k sector disks, but your disks are not 4k sector aligned. This situation means you're likely experiencing terrible write performance to the NAS which is likely the cause of your problems. There was a Technical Bulletin about this a while back: http://www.readynas.com/?p=3690
First I would suggest you backup your data.
Then:
Two options:
Option i
1. Run the "Disk Test" boot option: http://www.readynas.com/kb/faq/boot/how_do_i_use_the_boot_menu#nvx_nvx_pioneer_edition
2. If all disks pass the disk tests then hot-remove (remove while NAS is on) one disk, wait a minute or two. Then hot-add the disk again. The disk should be wiped and re-added to your array
3. Once your volume status is "redundant" again, repeat for the next disk
Option ii
1. Backup your data and verifying the backup is successful
2. Do a System > Config Backup (keep the zip file that is downloaded. If it is extracted automatically you may find the zip file in the Recycle Bin)
3. Do a factory reset, either via System > Update > Factory Default or via the boot menu: http://www.readynas.com/kb/faq/boot/how_do_i_use_the_boot_menu#nvx_nvx_pioneer_edition
4. Restore Config Backup
5. Restore data from backup
Option ii is better. This will give you native EXT4 meaning you will be able to create iSCSI targets >2TB. I think VMWare may be limited to targets of 2TB in size (not sure about this, you should look into this), but if there is a limit currently this may change in the future.
Once you've got 4k sector alignment if you still have issues further troubleshooting can be done.
Please don't use Cat5 cabling. That's old junk unless you're not interested in using gigabit ethernet. Cat5e is the oldest ethernet cable you should consider using.
An MTU of 9000 sounds like what you'd have with Jumbo Frames on, not off. An MTU of 1500 sounds more like what one would expect with Jumbo Frames disabled.
Edit: You're using 4k sector disks, but your disks are not 4k sector aligned. This situation means you're likely experiencing terrible write performance to the NAS which is likely the cause of your problems. There was a Technical Bulletin about this a while back: http://www.readynas.com/?p=3690
First I would suggest you backup your data.
Then:
Two options:
Option i
1. Run the "Disk Test" boot option: http://www.readynas.com/kb/faq/boot/how_do_i_use_the_boot_menu#nvx_nvx_pioneer_edition
2. If all disks pass the disk tests then hot-remove (remove while NAS is on) one disk, wait a minute or two. Then hot-add the disk again. The disk should be wiped and re-added to your array
3. Once your volume status is "redundant" again, repeat for the next disk
Option ii
1. Backup your data and verifying the backup is successful
2. Do a System > Config Backup (keep the zip file that is downloaded. If it is extracted automatically you may find the zip file in the Recycle Bin)
3. Do a factory reset, either via System > Update > Factory Default or via the boot menu: http://www.readynas.com/kb/faq/boot/how_do_i_use_the_boot_menu#nvx_nvx_pioneer_edition
4. Restore Config Backup
5. Restore data from backup
Option ii is better. This will give you native EXT4 meaning you will be able to create iSCSI targets >2TB. I think VMWare may be limited to targets of 2TB in size (not sure about this, you should look into this), but if there is a limit currently this may change in the future.
Once you've got 4k sector alignment if you still have issues further troubleshooting can be done.
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