Jump to content
We're Hiring! Full Stack Developer ×

3 parity sync errors after removing 2 disks


Go to solution Solved by JorgeB,

Recommended Posts

Last month's parity sync completed with 0 errors.  Since then, I've installed a new disk and SATA controller.  The disk is an unassigned device and is the only disk connected to the controller.  I cancelled this month's parity sync 3 minutes in because I was planning to zero and remove some smaller disks.  I zeroed two disks (4 & 5) using the dd method.  Each was zeroed one at a time.  Once completed, I stopped the array, performed a new config, preserved all assignments, set disk 4 and 5 unassigned, clicked parity is valid and started the array.  I started a manual parity sync.  When it completed, it reported 3 errors.  I'll re-run another parity sync, but any thoughts on possible cause?  This is first parity error on this server.

 

dd bs=1M if=/dev/zero of=/dev/md4p1 status=progress
dd bs=1M if=/dev/zero of=/dev/md5p1 status=progress

 

 

Link to comment
2 hours ago, JorgeB said:

Maintenance mode should always be used, unless you manually unmount those disks before doing it, if not a few sync errors are expected.

 

Thanks.  The docs procedure implies using maintenance mode gives better performance but, isn't necessarily crucial for maintaining parity during a disk clear.  

Quote

For best performance, make sure there are no reads/writes happening to the array. The easiest way to do this is to bring the array up in maintenance mode.

 

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...