ChkDsk on RAID

Hello Experts
Can I run a chkdsk on a RAID 1 array?  I have an old 2003 server that is a backup DC and runs license managers for some programs.  I'm getting the following in event viewer and the attached image on the server.
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Event Type:      Error
Event Source:      Ntfs
Event Category:      Disk
Event ID:      55
Date:            11/20/2017
Time:            10:16:45 AM
User:            N/A
Computer:      server-name
Description:
The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume OS.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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Thanks
cja-tech-guyAsked:
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Dr. KlahnPrincipal Software EngineerCommented:
Yes, you can run CHKDSK on a RAID array.  However, if it is at all possible, do a full backup of the array in the state that it is in now.  CHKDSK has been known to make corruptions worse.

I'd certainly run CHKDSK with the /V switch and without the /F switch for the first try, to see what it finds.
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nobusCommented:
as Dr Klahn says -  be care ful
i suggest to run first a disk diagnostic on the bad drive - to Ensure it operates properly; if not running chkdsk will certainly make things worse
you can hook the drive to a working system a s2nd drive to do so, or boot from a diag cd, like UBCD to run the diag
what disk model is it??
Hardware diagnostic CD    UBCD
---------------------------------------------------
go to the download page, scroll down to the mirror section, and  click on a mirror to start the download
Download the UBCD and make the cd   <<==on a WORKING PC, and boot the problem PC from it
Here 2 links, one to the general site, and a direct link to the download

since the downloaded file is an ISO file, eg ubcd527.iso - so you need to use an ISO burning tool
if you don't have that software, install cdburnerXP : http://cdburnerxp.se/

If you want also the Ram tested - run memtest86+ at least 1 full pass,  - you should have NO errors!
direct download :  http://www.memtest.org/
 
For disk Diagnostics run the disk diag for your disk brand (eg seagate diag for seagate drive)  from the HDD section -  long or advanced diag !  (runs at least for30 minutes)

http://www.ultimatebootcd.com/      

**  you can make a bootable cd - or bootable usb stick
*** note *** for SSD drives  use the tool from the manufacturer, like intel 's toolbox :
https://downloadcenter.intel.com/download/18455/Intel-Solid-State-Drive-Toolbox

for completeness -here's how i handle disk problems : http://www.experts-exchange.com/Storage/Hard_Drives/A_3000-The-bad-hard-disk-problem.html

==>>****in order to be able to  boot from CD or usb - you may have to disable secure boot in the bios
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noxchoGlobal Support CoordinatorCommented:
Actually you can’t run chkdsk on RAID because it is usually run on a file system. File system is a virtual level layer on RAIDed harddrives. And corrections done by chkdsk are influencing the file system only. Depending on hiw severe the problems with file system (ntfs or fat32) the check procedure can either fix them and everything will be good or it can make things worse if the fixing goes wrong. Thats why you need first to run chkdsk x: without any parameter like F.
If the read only run detects errors like cross-linked file records then I would recommend you first making a backup copy of your data and only then running chkdsk with F key.
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cja-tech-guyAuthor Commented:
I'm going to remove this server from the domain and reinstall updated operating system.  I will split point between all contributors.

thanks,
cja
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