Re: Slow RAID resync

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Updating my own post iostat shows /dev/sdb is at 100% transferring at 4MB/S

So what limits a disk to 4MB/S???

On 18 March 2014 08:43, Jeff Allison <jeff.allison@xxxxxxxxxxxxxxx> wrote:
> OK todays problem.
>
> I have a HP N54L Microserver running centos 6.5.
>
> In this box I have a 3x2TB disk raid 5 array, which I am in the
> process of extending to a 4x2TB raid 5 array.
>
> I've added the new disk --> mdadm --add /dev/md0 /dev/sdb
>
> And grown the array --> mdadm --grow /dev/md0 --raid-devices=4
>
> Now the problem the resync speed is v slow, it refuses to rise above
> 5MB, in general it sits at 4M.
>
> from looking at glances it would appear that writing to the new disk
> is the bottle neck, /dev/sdb is the new disk.
>
> Disk I/O   In/s   Out/s
> md0           0       0
> sda1          0       0
> sda2          0      1K
> sdb1  3.92M       0
> sdc1      24.2M   54.7M
> sdd1      11.2M   54.7M
> sde1      16.3M   54.7M
>
> I partitiioned the disk with --> parted -a optimal /dev/sdb
>
> [root@nas ~]# parted -a optimal /dev/sdb
> GNU Parted 2.1
> Using /dev/sdb
> Welcome to GNU Parted! Type 'help' to view a list of commands.
> (parted) p
> Model: ATA ST2000DM001-1E61 (scsi)
> Disk /dev/sdb: 2000GB
> Sector size (logical/physical): 512B/4096B
> Partition Table: msdos
>
> Number  Start   End     Size    Type     File system  Flags
>  1      1049kB  2000GB  2000GB  primary  ntfs         raid
>
>  There is no ntfs filesystem on the disk, I've still not worked out
> how to remove that flag.
>
>  I've followed the article here -->
> http://www.cyberciti.biz/tips/linux-raid-increase-resync-rebuild-speed.html
>  to attempt to speed it up but no joy.
>
> Any Ideas what I've done wrong?
>
>  parted output
>
> [root@nas ~]# parted -l
> Model: ATA ST31000528AS (scsi)
> Disk /dev/sda: 1000GB
> Sector size (logical/physical): 512B/512B
> Partition Table: msdos
>
> Number  Start   End     Size    Type     File system  Flags
>  1      1049kB  525MB   524MB   primary  ext4         boot
>  2      525MB   1000GB  1000GB  primary               lvm
>
>
> Model: ATA ST2000DM001-1E61 (scsi)
> Disk /dev/sdb: 2000GB
> Sector size (logical/physical): 512B/4096B
> Partition Table: msdos
>
> Number  Start   End     Size    Type     File system  Flags
>  1      1049kB  2000GB  2000GB  primary  ntfs         raid
>
>
> Model: ATA ST2000DM001-9YN1 (scsi)
> Disk /dev/sdc: 2000GB
> Sector size (logical/physical): 512B/4096B
> Partition Table: msdos
>
> Number  Start   End     Size    Type     File system  Flags
>  1      1049kB  2000GB  2000GB  primary               raid
>
>
> Model: ATA WDC WD25EZRS-00J (scsi)
> Disk /dev/sdd: 2500GB
> Sector size (logical/physical): 512B/4096B
> Partition Table: msdos
>
> Number  Start   End     Size    Type     File system  Flags
>  1      1049kB  2000GB  2000GB  primary  ntfs         raid
>
>
> Model: ATA ST2000DL001-9VT1 (scsi)
> Disk /dev/sde: 2000GB
> Sector size (logical/physical): 512B/4096B
> Partition Table: msdos
>
> Number  Start   End     Size    Type     File system  Flags
>  1      1049kB  2000GB  2000GB  primary               raid
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