From mboxrd@z Thu Jan 1 00:00:00 1970 From: Justin Piszcz Subject: Re: Correct way to create multiple RAID volumes with hot-spare? Date: Wed, 23 Aug 2006 06:34:47 -0400 (EDT) Message-ID: References: <44EB5579.4020200@maine.edu> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: In-Reply-To: <44EB5579.4020200@maine.edu> Sender: linux-raid-owner@vger.kernel.org To: Steve Cousins Cc: Linux RAID Mailing List List-Id: linux-raid.ids On Tue, 22 Aug 2006, Steve Cousins wrote: > Hi, > > I have a set of 11 500 GB drives. Currently each has two 250 GB partitions > (/dev/sd?1 and /dev/sd?2). I have two RAID6 arrays set up, each with 10 > drives and then I wanted the 11th drive to be a hot-spare. When I originally > created the array I used mdadm and only specified the use of 10 drives since > the 11th one wasn't even a thought at the time (I didn't think I could get an > 11th drive in the case). Now I can manually add in the 11th drive partitions > into each of the arrays and they show up as a spares but on reboot they > aren't part of the set anymore. I have added them into /etc/mdadm.conf and > the partition type is set to be Software RAID (fd). > > Maybe I shouldn't be splitting the drives up into partitions. I did this due > to issues with volumes greater than 2TB. Maybe this isn't an issue anymore > and I should just rebuild the array from scratch with single partitions. Or > should there even be partitions? Should I just use /dev/sd[abcdefghijk] ? > > On a side note, maybe for another thread, the arrays work great until a > reboot (using 'shutdown' or 'reboot' and they seem to be shutting down the md > system correctly). Sometimes one or even two (yikes!) partitions in each > array go offline and I have to mdadm /dev/md0 -a /dev/sdx1 it back in. Do > others experience this regularly with RAID6? Is RAID6 not ready for prime > time? > > As for system information, it is (was) a Dual Opteron with CentOS 4.3 (now > I'm putting FC5 on it as I write) with a 3Ware 8506-12 SATA RAID card that I > am using in JBOD mode so I could do software RAID6. > > Thanks for your help. > > Steve > -- > ______________________________________________________________________ > Steve Cousins, Ocean Modeling Group Email: cousins@umit.maine.edu > Marine Sciences, 452 Aubert Hall http://rocky.umeoce.maine.edu > Univ. of Maine, Orono, ME 04469 Phone: (207) 581-4302 > > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > If you are using SW RAID, there is no 2TB limit. Justin.