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Reallocation warning message
Hello experts require some expert advice.
two days ago after a disk test i got an email from my readynas 314 that disk 1 had to be reallocated and it later added this could mean a disk is failing.
status quo all are working fine. some google search adviced i keep track of these if they allocation errors increases it will be time to replace a disk. so my first question is how do i get to see this count. today i downloaded raidar 6.5 and it gave a number 1688 reallocation errors on disk 1? is it time to replace a new disk then?
i got this readynas 6 years ago in 2014 and i had then bought 4 X 3 TB Seagate Barracuda SATA III 7200rpm. i can find this only in amazon and it says old model. i am assuming my other 3 disks are doing fine. can i buy a different model like seagate iron wolf 3 TB and 7200 rpm ? or even other brands and keep the 3 TB and rpm same. i am wondering the other three will eventually die out and thought get something newer model than getting a seagate barracuda for $77 that way when others fall out i can replace it with newer model of same type.
any suggestions on what i should consider while buying a replacement disk ?
really appreciate your inputs
Many Thanks
Rags
aniraghome wrote:
today i downloaded raidar 6.5 and it gave a number 1688 reallocation errors on disk 1? is it time to replace a new disk then?
Definitely it is time to replace it.
Opinions on when to replace a disk vary. Personally I will replace a disk before the reallocated sectors count reaches 50 myself. But everyone would say that ~1700 reallocated sectors is a failed disk.
aniraghome wrote:
i got this readynas 6 years ago in 2014 and i had then bought 4 X 3 TB Seagate Barracuda SATA III 7200rpm.
Don't get a new Barracuda - several of those are now SMR drives, and aren't good options for RAID arrays.
If you want to stick with 7200 RPM, then I'd suggest a WD Red Pro or a Seagate Ironwolf Pro. Currently shipping models start at 4 TB, so you would need to go with a bigger size. Note you'll need to upgrade two drives to the larger size to get more space in the volume. The capacity rule is "sum the disks and subtract the smallest).
Other enterprise-class SATA drives would also work (WD Gold to give one example).
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Hi aniraghome
This disk is definitely bad! The ReadyNAS have a detection system to ensure a disk is indeed bad before alerting you. You can read more about that here in this link
So, the NAS is already doing the checks for you - i.e. are the errors increasing, etc. If it exceeds the thresholds as described in the above link, you get an alert. At that point it is time to replace the disk.
As for buying a new disk, here is a link to the HDD compatibility list
Please do ensure that you have an up-to-date backup. When disks are getting older, they will be more prone to failure. Replacing the bad disk with a new one will kick in re-sync of the RAID and this is a "strenuous" task for the disks. It is not uncommon to see disks with a long life span, fail during a resync because they were close the end anyway. A disk failure during the sync of your RAID 5, will result in RAID failure and total data loss.
So, please backup beforehand :)
Cheers
- Thank you this was informative especially the link with the reallocated sectors. I do a weekly backup and did a round of leftovers and backed them now. Fingers crossed after the new raid syncing.
aniraghome wrote:
today i downloaded raidar 6.5 and it gave a number 1688 reallocation errors on disk 1? is it time to replace a new disk then?
Definitely it is time to replace it.
Opinions on when to replace a disk vary. Personally I will replace a disk before the reallocated sectors count reaches 50 myself. But everyone would say that ~1700 reallocated sectors is a failed disk.
aniraghome wrote:
i got this readynas 6 years ago in 2014 and i had then bought 4 X 3 TB Seagate Barracuda SATA III 7200rpm.
Don't get a new Barracuda - several of those are now SMR drives, and aren't good options for RAID arrays.
If you want to stick with 7200 RPM, then I'd suggest a WD Red Pro or a Seagate Ironwolf Pro. Currently shipping models start at 4 TB, so you would need to go with a bigger size. Note you'll need to upgrade two drives to the larger size to get more space in the volume. The capacity rule is "sum the disks and subtract the smallest).
Other enterprise-class SATA drives would also work (WD Gold to give one example).
- If you want to stick with 7200 RPM, then I'd suggest a WD Red Pro or a Seagate Ironwolf Pro. Currently shipping models start at 4 TB, so you would need to go with a bigger size.
——————
Thanks again for your reply.
One question i have on disk buy : i have three other barracudas that are 3TB @ 7200 RPM cache 64mb if i get a wd or iron wolf that is 4TB and higher cache will that still be okay. If i get the new disk at 5400 isthere any harm different disks spinning at different speeds?
Assuming other three disks are fine if i do end up getting two disks apart from disk 1 which had these reallocated sectors which other disk can i swap/replace the new second disk with?
aniraghome wrote:
One question i have on disk buy : i have three other barracudas that are 3TB @ 7200 RPM cache 64mb if i get a wd or iron wolf that is 4TB and higher cache will that still be okay.Yes. The disk size matters a lot (and as I said SMR disks should be avoided). Cache size doesn't.
One warning here - Netgear does recommend backing up the array before you replace disks. When you replace a disk, the system has to read every sector on the remaining ones to rebuild the array. That does stress the disks (and can uncover issues you didn't know were there). So it is a good idea to update your backup (or make one) first - even if that means you have to purchase USB drive(s) to do that.
aniraghome wrote:
If i get the new disk at 5400 is there any harm different disks spinning at different speeds?If you mix speeds, then the RAID will slow down (likely somewhere between a pure 7200 rpm array and a pure 5400 rpm array) - but it should still work. I'm not mixing speeds at the moment, but I have done that in the past for some years and had no issues at all. The NAS will give you a warning about mixed speeds if you add a slower disk, but it will let you do it.
I think Sandshark did run into an issue (spin up time at boot?) where he suspected mixed RPMs were at fault - I don't recall the details or the strength of the evidence. Hopefully he'll join in and clarify that.
FWIW, although your Barracudas seem to have worked out for you, there are quite a few posters who had issues with them (and BackBlaze found them to be unreliable in RAID arrays). Given their age and track record, you might consider schedule replacing them over time, and not wait for them to fail. If you want to go with the less expensive (and cooler) NAS-purposed drives, then you could get one or more WD Red Plus (not a WD Red - they are SMR) or Seagate Ironwolf drives. You'll get the warning, but it should work out ok during the transition period when you are mixing them.
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