Hi Christian, I didn't create the partitions beforehand, which is probably the reason why we had differing outcomes. The actual partitions were fine, I could mount the root partition from a live cd. However when the server tried to boot it never loaded grub, it just sat there with a blinking cursor, which suggests to me ceph-deploy overwrote the 1st sector of the disk, where grub normally resides. Nick -----Original Message----- From: Christian Balzer [mailto:chibi@xxxxxxx] Sent: 01 March 2015 03:44 To: ceph-users@xxxxxxxxxxxxxx Cc: Nick Fisk Subject: Re: Booting from journal devices Hello, On Sat, 28 Feb 2015 18:47:14 -0000 Nick Fisk wrote: > Hi All, > > > > Thought I would just share this in case someone finds it useful. > > > > I've just finished building our new Ceph cluster where the journals > are installed on the same SSD's as the OS. The SSD's have a MD raid > partitions for the OS and swap and the rest of the SSD's are used for > individual journal partitions. The OS is Ubuntu and as such the > default install is using MBR partitions. > When you say MBR, do you mean DOS partitions? > > > After we created the OSD's, the servers were unable to boot anymore. > This was caused by the ceph-deploy making GPT partitions for the > journals on the SSD's, effectively what it looks like is that its > overwriting the MBR boot record. > Another reason I dislike these black box, "we know better what you want" approaches. Which version of ceph-deploy was this? Did you create the journal partitions beforehand? Because I have a cluster very much like it and ceph-deploy v1.5.7 did not touch the OS/Journal SSDs other than initializing the journals (partitions had been created with fdisk before). Christian > > > To fix it I carried out the following steps:- > > > > 1. Used gdisk on both SSD's to create a new partition from sector > 34 to 2047, of type EF02 > > 2. Ran grub-install against each SSD device > > > > Hope that's helps someone, if they come across the same problem. > > > > Nick > > > > -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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