Re: mdadm --grow with --backup-file does not create backupfile?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sun, 12 Oct 2014 20:26:05 -0500 Ram Ramesh <rramesh2400@xxxxxxxxx> wrote:

> I added a new disk and grew my raid6 md0 with the following command line
> 
>     sudo mdadm --grow --raid-devices=5
>     --backup-file=/root/grow_md0.bkp_file --layout=normalise /dev/md0
> 
> I got a response that stated that mdadm needed to backup 384K of data. 
> However, when I checked after about 5min there was no backup file. Is 
> this expected?

Yes.

When increasing the size of an array, the backup file is needed  for a tiny
fraction of a second at the start.
When decreasing the size it is needed  for a tiny fraction if a second at the
end.
When the size isn't changed it is needed for the entire time.

... unless you have a new kernel and a new mdadm, and then the backup file
isn't needed.

NeilBrown



> 
>     386 > sudo ls /root
>     <no files. so no output>
>     387 > sudo ls /root/grow_md0.bkp_file
>     ls: cannot access /root/grow_md0.bkp_file: No such file or directory
> 
> Ramesh
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Attachment: pgpFckXVOKAXc.pgp
Description: OpenPGP digital signature


[Index of Archives]     [Linux RAID Wiki]     [ATA RAID]     [Linux SCSI Target Infrastructure]     [Linux Block]     [Linux IDE]     [Linux SCSI]     [Linux Hams]     [Device Mapper]     [Device Mapper Cryptographics]     [Kernel]     [Linux Admin]     [Linux Net]     [GFS]     [RPM]     [git]     [Yosemite Forum]


  Powered by Linux