On Fri, 15 Jun 2012 16:40:56 -0500 Stan Hoeppner <s...@hardwarefreak.com> wrote:
> On 6/15/2012 8:36 AM, Ramon Hofer wrote: > > > First of all I tried to set the raid5 with the WD 20EARS and didn't > > have much luck. They led to fail events when mdadm builds the array. > > They "worked" in my Netgear NV+ with very low r/w rates <5 MB/s > > (which I now assume is because of the disks. > > Ok, I'm confused. You had stated you currently have 4x2TB disks and > 4x1.5TB disks. WD20EARS are 2TB disks. You said you'd already > created a RAID5 and added to a linear array, then copied a bunch of > files from the 1.5TB array, these 1.5TB disks presumably in the > Netgear. Is this correct? Is the md RAID5 inside the linear array > still working? Which disks is it made of? Ok, sorry for the confusion. The four 2 TB WD green were in the Netgear NAS and the four 1.5 TB Samsung are in the old raid5 (md9). I removed the 2 TB disks from the NAS and mounted them in the Norco and connected to the server vio lsi and expander. On these WD drives I created the raid5 (md1) and on top of that the linear array (md0). Upon creation of md1 the fourth disk (sdd) was added as a spare which I had to add manually by setting mdadm --readwrite /dev/md1 While it was syncing the disks I copied the files from md9 to md0. During this proces sdb was set as faulty. > > That's why I'm already thinking of buying new disks. > > Well lets look at this more closely. The disks may not be bad. How > old are they? Send me your dmesg output: > > ~$ cp /var/log/dmesg /tmp/dmesg.txt > > then email dmesg.txt to me. I've uploaded dmesg to pastebin hope this is ok. http://pastebin.com/raw.php?i=dek1wca4 > The WD Black 2TB 7.2k is tested for desktop RAID use (Linux md) and > has a 5 year warranty, costs $210. The Seagate Barracuda TX 2TB 7.2k > is also tested for desktop RAID use, has a 3 year warranty, and costs > $210. > > My advice: spend more per drive for less capacity and get a 3/5 times > longer warranty, and a little piece of mind that the drives are > designed/tested for RAID use and will last at least 5 years, or be > replaced at no cost for up to 5 years. Great advice! I'll go for the WD Black 2TB. I found them for CHF 199.- > > So if I see low rates in the future I can add a new raid5 and get > > higher throughbput again because the linear raid would write first > > to the new array? > > I'm not sure what you're asking here. Adding a new 4 disk RAID5 to > the linear array doesn't make anything inherently faster. It simply > adds capacity. Your read/write speed on a per file basis will be > about the same in the "new space" as in the old. I explained all of > this before you made the decision to go with the linear route instead > of using md reshaping to expand. You said you understood and that it > was fine as your performance requirements are low. Yes sorry it's absolutely fine. I was just curious because you wrote "when the array fills up it gets slower". So I thought when I add four new disks I'll get free space added and the linear array won't be filled anymore as much as before and so it could regain it's previous speed again. But really not important for my case! Just curiosity ;-) > > > No really. The adventure of enlarging my media server would have > > ended in total frustration! > > There's still time for frustration--you're not done quite yet. lol Yes but now I'm in semi known territory ;-) Cheers Ramon -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120616041540.0532a794@hoferr-x61s.hofer.rummelring
