Hi, I did the above changes on the server ( adding enterprise disks for storage domains ), and there are improvements. But. I just had a vm getting into "VM paused due to I/O error" :( . This vm has both disks as "thin-provisioning", and it runs as an OpenShift node ( Centos 7). Any chance that the problem could be because the disks are not "pre-alocated" and the filesystem writes are to intensive ? Getting a bit worried since this stack it's supposed to be seen as a production system.... Thank you very much !
On Mon, Jul 16, 2018 at 3:59 PM, Andrei Verovski <andre...@starlett.lv> wrote: > Hi, > > Looks almost good, see comments below. > > On 16 Jul 2018, at 13:48, Leo David <leoa...@gmail.com> 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 <andre...@starlett.lv> > 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 <leoa...@gmail.com> 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@ovirt.org >> > To unsubscribe send an email to users-le...@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@ovirt.org/message/NC2QQNT2E57DYZ3W6MZUBQO75RHSZOBY/ >> >> > > > -- > Best regards, Leo David > > > -- Best regards, Leo David
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