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Forum Discussion
How to replace a disk with SMART errors
Hi,
I have a readynas ultra 6 plus. The unit has a a single volume, comprised of three 3TB Western Digitial drives, model WD30EZRS, configured as a x-raid-2 single redundancy volume; these drives are on the HCL. The Readynas died a couple of days ago ("no disks detected") but I resurrected it with the help of the boot menu.
Now the readynas seems fine. No apparent data loss. The SMART status on the health page shows "OK" for all 3 disks. However, disk number 2 shows increasing SMART errors:
SMART Information for Disk 2
Model: WDC WD30EZRS-00J99B0
Serial: WD-WCAWZ0013414
Firmware: 80.00A80
SMART Attribute
Raw Read Error Rate 0
Spin Up Time 8108
Start Stop Count 37
Reallocated Sector Count 0
Seek Error Rate 0
Power On Hours 7006
Spin Retry Count 0
Calibration Retry Count 0
Power Cycle Count 35
Power-Off Retract Count 17
Load Cycle Count 254718
Temperature Celsius 41
Reallocated Event Count 0
Current Pending Sector 72
Offline Uncorrectable 56
UDMA CRC Error Count 0
Multi Zone Error Rate 92
ATA Error Count 0
So, I am going to replace the drive. Western digital is sending me a new one under the warranty. I have handy a new drive, a Seagate 3TB drive, ST33000651AS also on the HCL.
My questions:
-is it safe to replace the failing drive with a different brand disk of the same size, i.e., the Seagate, or should I wait for the new WD disk to arrive. Is there a risk the Seagate may be a few sectors too small (since is a different brand), and could this cause the resync to fail?
-Given that the readynas has not acknowledged the failing drive, the Smart status still shows OK for all drives, which is safer - a hot swap or a cold swap?
Thanks very much!
PS: the high LCC is because I ran the disk for 3 months without first running wdidle3, mainly because I didn't have a PC with a SATA port handy. I did manage to run wdidle about 9 months ago, and the LCC has stopped increasing. WD says the drive is good for an LCC of up to 1,000,000 so that should be OK. As far as I can tell, Netgear has no official policy requiring wdidle btw, I ran it based on comments on this forum.
I have a readynas ultra 6 plus. The unit has a a single volume, comprised of three 3TB Western Digitial drives, model WD30EZRS, configured as a x-raid-2 single redundancy volume; these drives are on the HCL. The Readynas died a couple of days ago ("no disks detected") but I resurrected it with the help of the boot menu.
Now the readynas seems fine. No apparent data loss. The SMART status on the health page shows "OK" for all 3 disks. However, disk number 2 shows increasing SMART errors:
SMART Information for Disk 2
Model: WDC WD30EZRS-00J99B0
Serial: WD-WCAWZ0013414
Firmware: 80.00A80
SMART Attribute
Raw Read Error Rate 0
Spin Up Time 8108
Start Stop Count 37
Reallocated Sector Count 0
Seek Error Rate 0
Power On Hours 7006
Spin Retry Count 0
Calibration Retry Count 0
Power Cycle Count 35
Power-Off Retract Count 17
Load Cycle Count 254718
Temperature Celsius 41
Reallocated Event Count 0
Current Pending Sector 72
Offline Uncorrectable 56
UDMA CRC Error Count 0
Multi Zone Error Rate 92
ATA Error Count 0
So, I am going to replace the drive. Western digital is sending me a new one under the warranty. I have handy a new drive, a Seagate 3TB drive, ST33000651AS also on the HCL.
My questions:
-is it safe to replace the failing drive with a different brand disk of the same size, i.e., the Seagate, or should I wait for the new WD disk to arrive. Is there a risk the Seagate may be a few sectors too small (since is a different brand), and could this cause the resync to fail?
-Given that the readynas has not acknowledged the failing drive, the Smart status still shows OK for all drives, which is safer - a hot swap or a cold swap?
Thanks very much!
PS: the high LCC is because I ran the disk for 3 months without first running wdidle3, mainly because I didn't have a PC with a SATA port handy. I did manage to run wdidle about 9 months ago, and the LCC has stopped increasing. WD says the drive is good for an LCC of up to 1,000,000 so that should be OK. As far as I can tell, Netgear has no official policy requiring wdidle btw, I ran it based on comments on this forum.
7 Replies
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- If the drive is on the HCL, you can mix brands, models and even sizes. In your case, with 3TB drives, a new drive must be 3TB since the new drive must be equal to or larger than the smallest drive in the array. You can even mix 5900 RPM drives with 7200 RPM drives, although with a high performance unit such as the Pro 6, you might see a slight reduction in file transfer rates.
- Thanks very much, PB.
Any advice on whether I should do a hot swap or a cold swap, given that the readynas thinks the drive is healthy (even though it has smart errors) - If you are pulling the drive with the smart errors to replace it with a new drives, it is best to hot pull the current drive and hot add the new drive. If you are removing a drive for testing, it is best to shut down the NAS and remove the drive for testing and then replace the drive before rebooting the NAS. With this procedure, no drive removal will be noted by the system.
- Thanks very much, PapaBear. I did a hot swap, resyncing took about 8 hours for a new 3 TB drive, and I seem to be OK now.
- Thanks for the update. Glad it is back to normal. Now you get to go through the RMA process with the old drive. Many of us tend not to use replacement drives in our NAS because they are almost always refurbished drives, and at times are drives not on the compatibility list. They do make good temp storage drives as long as you remember they have already failed once. They can also be useful as emergency drives in case of another drive failure.
- What is hcl?
- Hardware Compatibility List
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