NetApp and Linux

Check partitioning

Maybe this works:

# fdisk -l /dev/sda | awk '/^\/dev\//{fieldnum=2;if($fielnum=="*"){fieldnum++}blockalign=$fieldnum/8;if(blockalign!=int(blockalign)){match($0,$fieldnum);printf "%s <<<<<<< Bucket %d\n",substr($0,0,RSTART-2)"_"substr($0,RSTART,RLENGTH)"_"substr($0,RSTART+RLENGTH+1),8*(blockalign-int(blockalign));}else{print $0;}next;}{print;}'

Disk /dev/sda: 17.2 GB, 17179869184 bytes
64 heads, 32 sectors/track, 16384 cylinders, total 33554432 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d6bea

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048    13672447     6835200   83  Linux
/dev/sda2       _13674494_   33552383     9938945    5  Extended <<<<<<< Bucket 6
/dev/sda5        13674496    25391103     5858304   83  Linux
/dev/sda6        25393152    33552383     4079616   82  Linux swap / Solaris

Partition 2 does not matter because it is just metadata of partitioning. We are aligned!

Remove multipath LUNs

This writes out the commands to delete multipathed devices for filer <filer> (empty volumes parameter to gawk means all volumes):

( sanlun lun show -p <filer> ; echo ) | gawk -v volumes="/vol/vol1:/vol/vol2"'
BEGIN {
  split(volumes,vols,":");
}
/ONTAP Path:/,/^$/ {
  if(/ONTAP Path:/){
    opath=$NF;
    if (volumes==""){
      todelete="yes";
    }else{
      odev=$NF;
      gsub(/^.*:/,"",odev);
      for(vol in vols){
        if (odev == vols[vol] || volumes==""){
          todelete="yes";
        }
      }
    }
  }
  if(todelete!="yes")next;
  if(/Host Device:/){
    command="dmsetup info --columns --noheadings -o open  /dev/mapper/"$NF;
    command | getline inuse;
    close(command);
    if (inuse!=0) {
      printf "#\n## Device %s (%s) is in use!!!\n## check with: lsof | grep \"$(dmsetup info --columns --noheadings --separator \",\" -omajor,minor /dev/mapper/%s)\"\n#\n",$NF,opath,$NF;
    } else {
      printf "multipath -w %s\n",$NF;
      printf "multipath -f /dev/mapper/%s && (\n",$NF;
    }
  };
  if(inuse==0 && $2 ~ /(primary|secondary)/){
    printf "echo 1 > /sys/block/%s/device/delete\n",$3;
  }
  if (inuse==0 && /^$/) { printf ")\n";}
}
/^$/ {
  mpathdevice="";
  todelete="no";
  delete devices;
}
'

Links

• NetApp KB ID: 3011193 - What is an unaligned I/O?