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benjistark

Can hard disk with bad sectors still be used?

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I just did a fresh install of DSM 6.1. While creating a RAID 5 group, there is an alert that it found 4 bad sectors in one of the hard disk. However, the status shows the system is healthy and the hard disk is normal. I am wondering is it still save to continue with the RAID 5 parity consistency check or should I cancel the whole thing and replace the hard disk and rebuild again?

Edited by benjistark

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If the HDD has bad sectors it will only get worse. That HDD should not be part of your raid or you might regret it sooner rather than later.


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there is also a good explanation why the appearance of bad sectors is a sign that should not be ignored and the disk should be replaced asap

"...

There are two types of remapping by disk hardware: P-LIST (mapping during factory production tests) and G-LIST (mapping during consumer usage by disk microcode).[1]

There are a variety of utilities that can read the Self-Monitoring, Analysis, and Reporting Technology (SMART) information to tell how many sectors have been reallocated, and how many spare sectors the drive may still have.[2] Because reads and writes from G-list sectors are automatically redirected (remapped) to spare sectors it slows down drive access even if data in drive is defragmented. If the G-list is filling up, it is time to replace the drive.[3]

..."

https://en.wikipedia.org/wiki/Bad_sector

 

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thanks for your response. since RAID 5 is 1-disk fault tolerance, will it be too late if I continue to use it until the server advice me to replace it?

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You can let it finish. Then replace it. No matter the raid I never recommend keeping faulty HDDs.

 

 

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1 minute ago, Polanskiman said:

You can let it finish. Then replace it. No matter the raid I never recommend keeping faulty HDDs.

 

 

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i usually replace the hard disk when the server gave me error in red. anyway, thanks. I will replace it when I have the means.

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It would depend on how the "bad" sectors are created, if it was a pending error, re-initialize the disk would also eliminate them, especially SMR drives.

but like @Polanskiman said, don't trust them any more.

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today, the hard disk with 4 bad sectors has failed and need to be replaced. luckily i haven't really started restoring the files into the server. I have removed the RAID group and redo the process without the failed disk.

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i'm wondering can i start create volume and copying files into the hard disk while the server is checking for parity consistency?

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47 minutes ago, benjistark said:

i'm wondering can i start create volume and copying files into the hard disk while the server is checking for parity consistency?

Yes you can, however performance may be affected.

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Use Victoria to scan and repair hdd.

Wysłane z mojego SM-G930F przy użyciu Tapatalka

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The question(s) in this topic have been answered and/or the topic author has resolved their issue. This topic is now closed. If you have other questions, please open a new topic.

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