carlos28355 Posted October 20, 2015 Posted October 20, 2015 Its been a little over a month since my last parity check so i decided to run one last week and i got on yesterday and much to my surprise it was saying 88 days remaining. the days have gone up to 254 days. I see on disk 2 some sector warnings and now its not passing smart test. Originally on disk 4 someone had mentioned that a few relocated sectors isnt necessarily the worst thing since there are thousands of sectors that are spare. now my problems appear to be with disk 2 I have attached syslog and smart test for disk2 obviously the smart tests have failed. Of course i want to see if anyone's able to tell me if this is a worse case scenario or replace asap..kind of low on funds at the moment. Also wanted to know if a preclear of the drive would do anything at this point? thanks again smart-report-disk2-20151019-2011.doc syslog-20151019-1949.zip
itimpi Posted October 20, 2015 Posted October 20, 2015 No. The moment a drive starts failing SMART tests you should consider it failed and replace it ASAP. A failing SMART test can never be cleared. Once you get a FAILING NOW against any attribute the disk could fail completely at any moment. A pre-clear would not help and in fact I would think it might push the drive over the edge into total failure. The disk in question has a non-zero value for Pending sectors so cannot be read reliably and cannot reallocate sectors. In that state you are not going to have a successful parity check. I would suggest you replace the disk immediately.
dgaschk Posted October 21, 2015 Posted October 21, 2015 The drive is dead. You may be able to recover a portion of its contents. Do not use this drive for any other purpose. It has failed and only appears to be a hard drive. It is no longer a hard drive. Do not attempt to to use it as one.
carlos28355 Posted October 21, 2015 Author Posted October 21, 2015 alright. so ill stop the parity and shut down the drive and figure out how to get a new one. thanks again!!
carlos28355 Posted October 21, 2015 Author Posted October 21, 2015 quick question. im going to probably get the HGST 4tb NAS drive. thats is 7200 rpm. based off the hardware "which 4tb drive to buy" in the forums. this is my thought and question.... currently i have a wd 4tb as my parity. in those forums there are mixed feelings about if 7200 makes any difference other than running hotter in unraid. so assuming that unraid is faster with a 7200 rmp drive would it be wiser of me to use the new hdd as a parity? if the answer is yes then what is the best way to take the current 4tb parity drive and use that to replace the failing disk 2 mentioned above and take the new HGST and us that as the parity? thanks again!
trurl Posted October 21, 2015 Posted October 21, 2015 quick question. im going to probably get the HGST 4tb NAS drive. thats is 7200 rpm. based off the hardware "which 4tb drive to buy" in the forums. this is my thought and question.... currently i have a wd 4tb as my parity. in those forums there are mixed feelings about if 7200 makes any difference other than running hotter in unraid. so assuming that unraid is faster with a 7200 rmp drive would it be wiser of me to use the new hdd as a parity? if the answer is yes then what is the best way to take the current 4tb parity drive and use that to replace the failing disk 2 mentioned above and take the new HGST and us that as the parity? thanks again! All parity operations, building, checking, updating, work in parallel with one or more of the array data disks, so if the data disks are slower it won't likely make much difference to have a faster parity drive. On the other hand, reading a data disk only involves that data disk, so if that data disk is faster that will make some difference. Plus, it is simpler to replace a data disk than to do the parity swap with a data disk that you are proposing.
carlos28355 Posted October 23, 2015 Author Posted October 23, 2015 thanks @trurl for the information. i shall leave the parity alone and just replace the data disk. thats better because the thought of trying to figure out how to do it the other way was making my head hurt :o haha
garycase Posted October 23, 2015 Posted October 23, 2015 I agree with just doing the drive replacement ... but there IS an advantage to having a 7200rpm parity drive => as already noted, it makes little-to-no difference with individual operations, but it DOES boost the performance nicely if the array is used by multiple clients, where you may have multiple write operations happening at the same time. In those cases, the faster seek time and transfer rate on the parity drive is very effective at speeding up the overall write time. But if you never have multiple simultaneous writes, then there's no reason to use the faster drive.
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