If I currently understand idea, when this 1 SSD will fail whole node with that SSD will fail. Correct? What scenario for node recovery in this case? Playing with "ceph-osd --flush-journal" and "ceph-osd --mkjournal" for each osd?
On Tue, May 7, 2013 at 4:17 PM, Mark Nelson <mark.nel...@inktank.com> wrote: > On 05/07/2013 06:50 AM, Barry O'Rourke wrote: > >> Hi, >> >> I'm looking to purchase a production cluster of 3 Dell Poweredge R515's >> which I intend to run in 3 x replication. I've opted for the following >> configuration; >> >> 2 x 6 core processors >> 32Gb RAM >> H700 controller (1Gb cache) >> 2 x SAS OS disks (in RAID1) >> 2 x 1Gb ethernet (bonded for cluster network) >> 2 x 1Gb ethernet (bonded for client network) >> >> and either 4 x 2Tb nearline SAS OSDs or 8 x 1Tb nearline SAS OSDs. >> > > Hi Barry, > > With so few disks and the inability to do 10GbE, you may want to consider > doing something like 5-6 R410s or R415s and just using the on-board > controller with a couple of SATA disks and 1 SSD for the journal. That > should give you better aggregate performance since in your case you can't > use 10GbE. It will also spread your OSDs across more hosts for better > redundancy and may not cost that much more per GB since you won't need to > use the H700 card if you are using an SSD for journals. It's not as dense > as R515s or R720XDs can be when fully loaded, but for small clusters with > few disks I think it's a good trade-off to get the added redundancy and > avoid expander/controller complications. > > > >> At the moment I'm undecided on the OSDs, although I'm swaying towards >> the second option at the moment as it would give me more flexibility and >> the option of using some of the disks as journals. >> >> I'm intending to use this cluster to host the images for ~100 virtual >> machines, which will run on different hardware most likely be managed by >> OpenNebula. >> >> I'd be interested to hear from anyone running a similar configuration >> with a similar use case, especially people who have spent some time >> benchmarking a similar configuration and still have a copy of the results. >> >> I'd also welcome any comments or critique on the above specification. >> Purchases have to be made via Dell and 10Gb ethernet is out of the >> question at the moment. >> >> Cheers, >> >> Barry >> >> >> > ______________________________**_________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/**listinfo.cgi/ceph-users-ceph.**com<http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com> > -- Igor Laskovy facebook.com/igor.laskovy studiogrizzly.com
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