Storage RAID/network configuration considerations


We are running a 12bay Synology NAS with 5HDDs (RAID5 diskgroup) on which we have one LUN which is attached to our vshpere cluster with an ISCSI trunk (unimportant data on it) . So far so good. Now we added 4 additional HDDs to the NAS and want to use the additional space for a new backup system. For the network side aswell as the disk group side we now possibilities to set that up now. We don't know which way is best practice. For example:

For the diskgroup part:
- Add the 4 Disks to a new RAID5 diskgroup and use it as Backup diskgroup (we then have two diskgroups on the NAS)
- Add the 4 Disks to the existing diskgroup, setup a new LUN for the backup

For the network part:
- Use the same Ethernet Trunk (2NICs= 2000 mbit/s) for vsphere and the backup system
- Use the free NIC 1000 mbit/s dedicated as new ISCSI Port for the backup system

What is the best way and why? Thanks everyone in advance!
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Drives: This is down to storage capacity and Risk. The more storage you have the more backups you can take/hold on the storage. Do you want multiple RAIDS for redundancy And/OR would a RAID5 with hot spare allow for all the redundancy you need. If I needed the space for holding as many backups as possible i would create 1 large RAID5 with hot spare, this would allow 24 hours for a replacement drive to be ordered in the event of failure and in the background the RAID set will already be rebuilding with the hot spare. ** never hold all your backups in a single location in case of massive hardware failure always tombstone to a set schedule

NICS: If you have Spare NIC's you may as well use them, if you have backups that maybe processing during business hours and you do not want to impact the Virtual Environment then separate. If they are running out of hours and you want to get maximum throughput both for the production kit during business hours and for the backups sets out of hours then team them. You may find that depending of the load you will never max out even if both systems are running together but that does depend on the resource requirements of the virtual infrastructure.

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windows-itAuthor Commented:
HI ncomper,
Thanks for your answer.

Drive Array:
No matter which described strategy I would go (A or B) I would size the backup space the same size. (RAID or LUN) So are there any other factors which I need to be aware of, if I go with one big RAID5 instead of two RAID5?

NICS: The load on the storage because of the vsphere cluster is not that heavy... So you think it would be best to team the NICS to a 3xNIC Trunk?
windows-itAuthor Commented:
Any other thoughts?
Thanks for any help!
~Drive Array: with RAID 5 you only allow a single Drive failure at any one time, if this fails and you have a hot spare it will auto Rebuild for you BUT it will not protect you against a 2nd drive failure until the set has finished the build. If you data is critical then Split into 2 or review other RAID options that the device can provision.

NIC: initially i would keep the NIC separate, monitor for 48/72 hours of backups and confirm the usage on the device, once you have accurate information you can move forward on either teaming them OR leaving separate to ensure performance on one does not impact the other. Some things are trial and error but do not impact the Live network if you have ability to test first.
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