From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Busby Subject: Re: Converting from Raid 5 to 6 Date: Mon, 24 Oct 2011 21:47:19 +0100 Message-ID: References: <20111025071443.4c497656@notabene.brown> <20111025073908.6d754588@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20111025073908.6d754588@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids I was sure i added the device before, but when rebooted the system it has seemed to lose the extra drive and i had already restarted the grow command with out checking the disk was there, so more than likely a mistake by me On 24 October 2011 21:39, NeilBrown wrote: > On Mon, 24 Oct 2011 21:19:22 +0100 Michael Busby > wrote: > >> Ok thanks, i have 1 small issue, when added the extra disk its been >> maked as spare, is this normal? >> >> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] >> [raid4] [raid10] >> md0 : active raid6 sde[0] sdg[6](S) sda[4] sdb[3] sdd[2] sdc[1] >> =A0 =A0 =A0 7814055936 blocks super 1.0 level 6, 512k chunk, algorit= hm 18 >> [6/5] [UUUUU_] >> =A0 =A0 =A0 [>....................] =A0reshape =3D =A03.0% (59244544= /1953513984) >> finish=3D11122.8min speed=3D2837K/sec >> > > It looks like the extra drive was added after you started the grow. > > So it is still a spare. > Once the grow finishes you will have a singly-degraded RAID6. > Then it will immediately start recovering the missing device to the s= pare. > > Did you add the extra drive after starting the grow - or before?? > > NeilBrown > > > >> >> >> >> On 24 October 2011 21:14, NeilBrown wrote: >> > On Mon, 24 Oct 2011 17:03:46 +0100 Michael Busby >> > wrote: >> > >> >> should the speed be very slow when doing this progress, its a lot >> >> slower than a normal grow >> > >> > Yes. >> > The array is being reshaped in-place. =A0i.e. data is being read f= rom part of >> > the array, rearranged, and written back to the same part of the ar= ray. >> > As you can imagine, this is risky - a crash will leave an inconsis= tent state. >> > Hence the backup file. =A0Everything in the array is first written= to the >> > backup file, then back to the array. =A0So it is slow. >> > >> > A "normal" grow is writing to somewhere where there is no valid da= ta, so it >> > doesn't need the backup. >> > >> > I do have a plan to make this faster.... but I have lots of plans = and little >> > time. >> > >> > NeilBrown >> > >> > >> > >> > >> >> >> >> reshape =3D =A01.2% (25006080/1953513984) finish=3D12481.8min spe= ed=3D2574K/sec >> >> >> >> On 24 October 2011 15:11, Mathias Bur=E9n wrote: >> >> > On 24 October 2011 14:11, Michael Busby wrote: >> >> >> At the moment i have a raid5 setup with 5 disks, i am looking=A0= to add a >> >> >> 6th disk and change from raid 5 to raid 6 >> >> >> >> >> >> having looked at Neil's site i have found the following comman= d, and >> >> >> just want to double check this is still the recommend way of >> >> >> converting >> >> >> >> >> >> mdadm --grow /dev/md0 --level=3D6 --raid-disks=3D6 --backup-fi= le=3D/home/md.backup >> >> >> >> >> >> also would i need to add the extra disk before or after the co= mmand? >> >> >> >> >> >> cheers >> >> >> -- >> >> >> To unsubscribe from this list: send the line "unsubscribe linu= x-raid" in >> >> >> the body of a message to majordomo@vger.kernel.org >> >> >> More majordomo info at =A0http://vger.kernel.org/majordomo-inf= o.html >> >> >> >> >> > >> >> > Hi, >> >> > >> >> > I grew my 6 disk RAID5 to a 7 disk RAID6. First, add the drive.= Then >> >> > partition it as required. Then add the drive to the array (I th= ink >> >> > it'll become a spare?). Then you can grow it. >> >> > >> >> > Make sure you're using the latest mdadm tools available. >> >> > >> >> > Regards, >> >> > Mathias >> >> > >> >> -- >> >> To unsubscribe from this list: send the line "unsubscribe linux-r= aid" in >> >> the body of a message to majordomo@vger.kernel.org >> >> More majordomo info at =A0http://vger.kernel.org/majordomo-info.h= tml >> > >> > > > -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html