Re: Is trim/discard supported on LVM RAID logical volume? (resent)

Heinz Mauelshagen <heinzm@redhat.com> · Tue, 29 Nov 2016 21:40:01 +0100



    Patrick,
    this doesn't work in upstream either.
    Your old stack with MD raid1 as PV processes ext4 fstrim ok but
      lvm "raid1" does not

      (yes, same MD raid runtime used in the kernel driven by the
      dm-raid target).

    
    Looking into this...
    Heinz

    
    On 11/28/2016 08:43 AM, Patrick Dung
      wrote:

    
        Hello,

        
        In
          my old setting, fstrim is supported:
        ext4 over LVM over MD software raid (mdadm) > SSD.

        
        After reading the recommendation in RHEL 6 https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/ch-ssd.html

        
        I change to use raid 1 mirror using 'LVM RAID logical volume'.
        It make use of MD raid internally.

        But
          I found fstrim does not work anymore. Is the behavior
          expected?
        

        Thanks
          and regards,
        Patrick
      

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