Unsolved
This post is more than 5 years old
3 Posts
0
566
July 29th, 2016 18:00
PowerEdge T110-II RAID questions
PE T110II RAID-1 Degraded, The Only Drive in RAID Volume Has Bad Blocks
Drive0 has bad blocks, Drive1 completely failed (missing). I replaced Drive1 and added the new drive as a hot spare and the RAID is in the process of rebuilding. I have a 2nd new drive I was going to add as a hot spare (Drive3) and once the current RAID status is Optimal, take Drive0 offline from Open Manage (remotely) and rebuild the RAID again with the 2nd hot spare. Is this possible and should I go this route or would it be better to replace Drive0, rebuild the RAID-1 from scratch with both new drives and restore from backup? My issue with restoring from backup is I tried a restore last week but I was getting an error message in Symantec System Recovery 2013 when attempting to restore the boot and system partition.
ballen5usa
3 Posts
0
July 30th, 2016 09:00
Any out there able to help?
Daniel My
10 Elder
•
6.2K Posts
0
July 30th, 2016 11:00
Hello
All drives have bad blocks. Each drive monitors and manages its own bad blocks. When a threshold is reached the SMART will report the drive as predictive failure. I would not suggest replacing a drive until it is predictive failure.
Any data that is lost or corrupted due to bad physical blocks can be repaired by most RAID controllers during a consistency check if redundant data is available. A patrol read will recovery bad blocks if redundant data is available. If the controller is not able to recreate the data on a new block due to the lack of redundancy in the array then the data will be unrecoverable and will need to be recreated by restoring from backup or reinstalling.
At this point I would run a consistency check on the array. If you receive unrecoverable block messages during the check then there is likely corrupt or missing data on the drives. If there are unrecoverable blocks I would run checks against the data(File system and database scans). The corrupted data may be something as simple as a web browser cookie. It can be difficult to track down data corruption, but if your data and operating system scans return no errors then I would suspect the data was related to a program of some kind. When you encounter issues with a program you can simply uninstall/reinstall to recreate the data.
Thanks
ballen5usa
3 Posts
0
July 30th, 2016 15:00
Hi,
That did not answer my question. The ONLY drive left in the RAID-1 is failing for sure and the 2nd drive in the RAID-1 failed outright completely already. You can hear the active drive physically "crunching" at times and the Win SYS log is reporting bad block after bad block. I want to know if rebuilding the RAID by installing a new 2nd drive is a viable route given the only drive left is still functioning albeit failing. Or if I should cut my loses and install both new drives and build the raid from scratch and recovery from backup. The system is up and it appears the bad blocks are not affecting the system partition area as the server is running somewhat normal.
Daniel My
10 Elder
•
6.2K Posts
0
July 30th, 2016 17:00
Yes, it is possible to rebuild the array by installing a second drive.
That is a decision that you will have to make. I provided an in-depth explanation of how to check for data loss/corruption to help make that decision in my previous post.
Thanks