On Sat, 21 Mar 2015 19:01:54 +0800 lingli tang <tanglingli001@xxxxxxxxx> wrote: > I am a newbie of mdadm. I have a question but find no answer in > document or google for last 10 days. > > The question is : RAID1 made by mdadm is full sync? for example, I > have two disk(sdb and sdc) to make RAID1 disk (/dev/md127), if I > commit an IO to the RAID1 disk (md127), it will return back to me when > all the two disk commit successfully or it will return back > to me once just one of the disk successfully commit. The write request will not return until it has been submitted to all, and returned by, all working devices. > > I have test with xfs and ext4 with sync option, and it seems that two > disk have lots of commit difference after reboot the server. is that > means mdadm return success when one of the disk is commit > successfully? That certainly shouldn't happen. I would need more details of the experiment that you performed. NeilBrown > -- > 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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