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
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