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Dreaded Raid5 Nightmare - Another drive fails during rebuild of another failed drive
Yesterday evening, one drive failed on my 6 drive RN51600 in XRAID Raid 5. I had a spare on hand, and immediately put in a replacement drive and a rebuild started. This morning, when I came in......
Everything has turned out all right. The NAS was backed up every night to Netgear's ReadyVault which actually had support for backup snapshots so I have plenty choices of how to recover. Most of the critical data has already been restored.
I had planned to restructure the unit in RAID10 next year anyway, so the failure just accelerated my plans by a few months.....If anything, it has made me reconsider RAID6 and which drives I put in the unit.
I'm not a big fan of RAID6 or WD Red Drives -- most of my datacenter deployments are RAID10 across 10-20 15K RPM SAS disks. But, for the small office sensitive to noise and carying more about energy efficiency than performance,which the ReadyNAS 516 is designed for -- it looks like RAID6 w/ WD RED 5900RPM drives is the trusted safe approach.
Going forward, I think the next time we upgrade the NAS I'll get the 8 drive 628x model....for random smile read/write ops, spindle count will be more important than RPM or RAID level and that is really the major area of performance concern w/ these units. It would be nice if Netgear also sold them w/ more ECC RAM - It can't be too expensive to put a few more 8GB ECC dimms in each chassis.
If you wanted data recovery attempted you shouldn't have replaced the 2nd failed disk. As RAID-5 protects against a single disk failure after a second disk failure it's important to proceed very cautiously.
RAID can't protect against too many disk failures which is one reason why backups are so important.
Some feel the risk of dual disk failures is too great for them to continue to use RAID-5.
Personally I disabled X-RAID, destroyed the default volume, created a new RAID-6 one and re-enabled X-RAID in my NAS. I like the additional peace of mind from having some protection against dual disk failures, but still backup. My data is important to me so I don't store it on just the one device.
Everything has turned out all right. The NAS was backed up every night to Netgear's ReadyVault which actually had support for backup snapshots so I have plenty choices of how to recover. Most of the critical data has already been restored.
I had planned to restructure the unit in RAID10 next year anyway, so the failure just accelerated my plans by a few months.....If anything, it has made me reconsider RAID6 and which drives I put in the unit.
I'm not a big fan of RAID6 or WD Red Drives -- most of my datacenter deployments are RAID10 across 10-20 15K RPM SAS disks. But, for the small office sensitive to noise and carying more about energy efficiency than performance,which the ReadyNAS 516 is designed for -- it looks like RAID6 w/ WD RED 5900RPM drives is the trusted safe approach.
Going forward, I think the next time we upgrade the NAS I'll get the 8 drive 628x model....for random smile read/write ops, spindle count will be more important than RPM or RAID level and that is really the major area of performance concern w/ these units. It would be nice if Netgear also sold them w/ more ECC RAM - It can't be too expensive to put a few more 8GB ECC dimms in each chassis.
You can use RAID-10 if you want. You can use RAID-50 if you prefer. The 8-bay supports RAID-60 as well.
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