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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] iSCSI and LVM
Hi >> I am going to get a storage server which will be connected to my Xen >> hosts via iSCSI/Ethernet. I wish to use LVM for the DomU disks. The >> storage server will have a RAID10 array, and 2 Xen hosts will connect >> to this (Each will have a 50% share of the RAID10 array, space wise). >> >> What is the best way to go about this? Should I: >> >> a) Split the RAID10 array into 2 partition on the storage server, and >> export 1 partition to each xen host, then let the Xen host manage LVM? >> >> or >> >> b) Do all LVM stuff on the storage server and export each LVM logical >> volume to the correct Xen hosts via iSCSI? Since each host could have >> around 100 VMs on it, that's a lot of iSCSI exporting! >> > If you export two "big luns" and do the LVM stuff on each Xens server > you will not be able to "switch" a VM from one server to the other (with > xm save/restore for example). With that setup a VM can only be started > on a specific server. Also you will have two LVM sets to manage. > > If you do all the storage management on your SAN migrate a VM from one > server to the other will be easy and even done "live". Also the storage > management will be "unified". The only problem could be the maximum > number of iSCSI Luns on yours SAN, but it often is greater than 127 > distinct units. > > Ok thanks for the advice. So I think I shall go down the root of doing all > LVM stuff on the SAN. > > However, I think that I will need more than 127 virtual machines, so having > an iSCSI target per VM is probably not an option. Is there any other > solution for Ubuntu/Debian? Would it be an option to have one iSCSI target, used by multiple clients where only one clients accesses a directory at a time?? that way it would be way easier to mgrate a vm from one host to another. HTH Regards, Serge Fonville -- http://www.sergefonville.nl Convince Google!! They need to support Adsense over SSL https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=10528 http://www.google.com/support/forum/p/AdSense/thread?tid=1884bc9310d9f923&hl=en _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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