[ovirt-users] Re: Raid configuration for single instance

Hi, Looks almost good, see comments below. On 16 Jul 2018, at 13:48, Leo David <leoalex(a)gmail.com&gt; wrote: Thank you very much, really helpfull. So I will have: 2 x Sandisk ssd plus 240GB ( still consumer grade ) for OS Run continues (2+ hours, random + sequential read/write) iozone tests (in a loop) before launching system on these SSD RAID. You may be lucky or may be not. 2 x Samsung sm863a ( dc grade ) 1.9TB for creating 1 x raid1 ssd volume 4 x Dell 2.4TB spinning ( dc grade ) for creating 1 x raid10 spinning volume 1 x nvme car for quick / non critical fast volume - I would go for gluster since there are chances to extend the cluster in near future. You can also set shared volume on (at least) 2 x external SAN, NAS, NFS server, whatever. Any thoughts on this config ? Any thougts on configuring the perc controller to be gluster optimized ( for replicated / ditributed replicated volumes ) ? Don’t think there are gluster-optimized settings. Run iozone tests to find optimal settings depending on your workload. Again, thank you very much ! On Mon, Jul 16, 2018 at 1:11 PM, Andrei Verovski <andreil1(a)starlett.lv&gt; wrote: > Hi, Leo, > > I would recommend the following configuration: > RAID1 120GB for the OS and oVirt software > RAID10 (GB whatever you need) for VM data > I tested RAID5 it appears slower then RAID10. > > Please note consumer SSD may appear to work with SAS RAID controller yet > actually they DO NOT ! > Load them with IOZONE stress test, and you will see complete freeze, and > in case of OS install on these SSD, unbootable dead system. > > I tested consumer WD and KingFast SATA SSD, with both HP and > 3Ware/Broadcom SAS RAID cards, all of them failed IOZONE stress test. > BTW, you can buy 120GB used SAS server disks on ebay for something close > to nothing. > Conventional (mechanical) SATA hard drives work fine with SAS RAID cards > (at least in my case). > > For single server you don’t need glusterfs, nfs is enough. > > > > On 16 Jul 2018, at 09:27, Leo David <leoalex(a)gmail.com&gt; wrote: > > > > Hello everyone, > > Based on your experiance or well know best practices can you provide me > with an advice on raid configuration ? > > I have a single server, that will have a couple of brand new enterprise > grade ssds, spinning and one pci nvme card. > > The server ( Dell PE r630 ) comes wirt Perc h730p raid controller with > 2gb cache. > > I am thinking of creating a raid 1 array with the 2 of ssd's and ne > raid10 array woth the rest of for spinning hdds. Then different gluster > volume on each, to provide me 2 ( ssd / sata ) storage domains. > > What do you think on haveing raid1 / raid10 as underlying HA storage > for gluster volumes ? > > At the moment a have some consumer devices ( samsung evo & seagate > spinning shingled type ) and about every day the vms get into "VM has been > paused due to storage IO errors" - i am thinking because of bad type hdds. > > Any thoughts on these ? > > Thank you , > > > > Leo > > -- > > Best regards, Leo David > > _______________________________________________ > > Users mailing list -- users(a)ovirt.org > > To unsubscribe send an email to users-leave(a)ovirt.org > > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > > oVirt Code of Conduct: https://www.ovirt.org/communit > y/about/community-guidelines/ > > List Archives: https://lists.ovirt.org/archiv > es/list/users(a)ovirt.org/message/NC2QQNT2E57DYZ3W6MZUBQO75RHSZOBY/ > > -- Best regards, Leo David