Safety remove hard driver from QNAP NAS Raid 5 Storage Pool

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sieupetvn
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Joined: Thu Aug 29, 2019 4:05 pm

Safety remove hard driver from QNAP NAS Raid 5 Storage Pool

Post by sieupetvn »

Hi every one,
I have QNAP NAS with storage pool in Raid5 (8 SSDs 2TB)
Now we wanna increase storage pool and remove 2 SSD from Raid group.
I try to looking for some guide but almost are extend and add more disk to storage pool.
Any body might help me pls
P3R
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Joined: Sat Dec 29, 2007 1:39 am
Location: Stockholm, Sweden (UTC+01:00)

Re: Safety remove hard driver from QNAP NAS Raid 5 Storage Pool

Post by P3R »

The number of disks in a RAID group can never be decreased. The only possible way to do that is to:
  1. Backup all data
  2. Remove the current RAID group (including pool and volumes on it)
  3. Create a new RAID group and storage pool and volume(s)
  4. Restore data from backup onto the new volume
How do you intend to remove disks and at the same time increase the storage pool? Are you going for much larger disks?
RAID have never ever been a replacement for backups. Without backups on a different system (preferably placed at another site), you will eventually lose data!

A non-RAID configuration (including RAID 0, which isn't really RAID) with a backup on a separate media protects your data far better than any RAID-volume without backup.

All data storage consists of both the primary storage and the backups. It's your money and your data, spend the storage budget wisely or pay with your data!
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