January 2018 - Users - oVirt List Archives

NFS sync vs async
by Jean-Francois Courteau 29 Jan '18

29 Jan '18

Hello there, At first I thought I had a performance problem with virtio-scsi on Windows, but after thorough experimentation, I finally found that my performance problem was related to the way I share my storage using NFS. Using the settings suggested on the oVirt website for the /etc/exports file, I implemented the following line: /storage *(rw,sync,no_subtree_check,all_squash,anonuid=36,anongid=36) The underlying filesystem is ext4. In the end, whatever the VM I am running through this NFS export, I get extremely poor write performance, like sub-100 IOPS (my disks usually can do 800-1k). Under the hood, iotop shows that my host IO is all taken up by jbd2, and if I understand correctly, it is the ext4 logging process. I have read that using the "async" option in my NFS export is unsafe, like if my host crashes during a write operation, it could corrupt my VM Disks. What is the best combination of filesystem / settings if I want to go with NFS sync? Is someone getting good performance with the same options as me? if so, why do I get such abysmal IOPS numbers? Thanks! J-F Courteau

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Q: Core Reservation on Hyperthreaded CPU
by Andrei V 29 Jan '18

29 Jan '18

Hi, I’m currently running node on HP ProLiant with 2 x Xeon with 4 core each. Because of hyperthreading each physical core is being seen as 2. How KVM/oVirt reserves cores if for example I allocate 4 CPU cores for VM ? Does it allocates 4 real CPU cores, or 2 cores with 2 threads each ? Each VM consumes very low CPU resources. What happens if # of used cores consumed by VMs will exceed real count of physical CPU cores ? Thanks. Andrei

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disk copy exception
by Donny Davis 28 Jan '18

28 Jan '18

I am trying to copy a disk that was from a storage domain that was imported from 4.1 to a newer storage domain and this exception is thrown in the UI Uncaught exception occurred. Please try reloading the page. Details: Exception caught: (TypeError) : Cannot read property 'g' of null Please have your administrator check the UI logs

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Basic parts for rebuilding ovirt server
by Alex Bartonek 27 Jan '18

27 Jan '18

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Bad hd? or?
by Alex Bartonek 27 Jan '18

27 Jan '18

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Has meltdown impacted glusterFS performance?
by Jayme 27 Jan '18

27 Jan '18

I've been considering hyperconverged oVirt setup VS san/nas but I wonder how the meltdown patches have affected glusterFS performance since it is CPU intensive. Has anyone who has applied recent kernel updates noticed a performance drop with glusterFS?

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oVirt 4.1.9 and Spectre-Meltdown checks
by Gianluca Cecchi 26 Jan '18

26 Jan '18

Hello, nice to see integration of Spectre-Meltdown info in 4.1.9, both for guests and hosts, as detailed in release notes: I have upgraded my CentOS 7.4 engine VM (outside of oVirt cluster) and one oVirt host to 4.1.9. Now in General -> Software subtab of the host I see: OS Version: RHEL - 7 - 4.1708.el7.centos OS Description: CentOS Linux 7 (Core) Kernel Version: 3.10.0 - 693.17.1.el7.x86_64 Kernel Features: IBRS: 0, PTI: 1, IBPB: 0 Am I supposed to manually set any particular value? If I run version 0.32 (updated yesterday) of spectre-meltdown-checker.sh I got this on my Dell M610 blade with Version: 6.4.0 Release Date: 07/18/2013 [root@ov200 ~]# /home/g.cecchi/spectre-meltdown-checker.sh Spectre and Meltdown mitigation detection tool v0.32 Checking for vulnerabilities on current system Kernel is Linux 3.10.0-693.17.1.el7.x86_64 #1 SMP Thu Jan 25 20:13:58 UTC 2018 x86_64 CPU is Intel(R) Xeon(R) CPU X5690 @ 3.47GHz Hardware check * Hardware support (CPU microcode) for mitigation techniques * Indirect Branch Restricted Speculation (IBRS) * SPEC_CTRL MSR is available: NO * CPU indicates IBRS capability: NO * Indirect Branch Prediction Barrier (IBPB) * PRED_CMD MSR is available: NO * CPU indicates IBPB capability: NO * Single Thread Indirect Branch Predictors (STIBP) * SPEC_CTRL MSR is available: NO * CPU indicates STIBP capability: NO * Enhanced IBRS (IBRS_ALL) * CPU indicates ARCH_CAPABILITIES MSR availability: NO * ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: NO * CPU explicitly indicates not being vulnerable to Meltdown (RDCL_NO): NO * CPU vulnerability to the three speculative execution attacks variants * Vulnerable to Variant 1: YES * Vulnerable to Variant 2: YES * Vulnerable to Variant 3: YES CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1' * Checking count of LFENCE opcodes in kernel: YES > STATUS: NOT VULNERABLE (107 opcodes found, which is >= 70, heuristic to be improved when official patches become available) CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2' * Mitigation 1 * Kernel is compiled with IBRS/IBPB support: YES * Currently enabled features * IBRS enabled for Kernel space: NO (echo 1 > /sys/kernel/debug/x86/ibrs_enabled) * IBRS enabled for User space: NO (echo 2 > /sys/kernel/debug/x86/ibrs_enabled) * IBPB enabled: NO (echo 1 > /sys/kernel/debug/x86/ibpb_enabled) * Mitigation 2 * Kernel compiled with retpoline option: NO * Kernel compiled with a retpoline-aware compiler: NO * Retpoline enabled: NO > STATUS: VULNERABLE (IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability) CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3' * Kernel supports Page Table Isolation (PTI): YES * PTI enabled and active: YES * Running as a Xen PV DomU: NO > STATUS: NOT VULNERABLE (PTI mitigates the vulnerability) A false sense of security is worse than no security at all, see --disclaimer [root@ov200 ~]# So it seems I'm still vulnerable only to Variant 2, but kernel seems ok: * Kernel is compiled with IBRS/IBPB support: YES while bios not, correct? Is RH EL / CentOS expected to follow the retpoline option too, to mitigate Variant 2, as done by Fedora for example? Eg on my just updated Fedora 27 laptop I get now: [g.cecchi@ope46 spectre_meltdown]$ sudo ./spectre-meltdown-checker.sh [sudo] password for g.cecchi: Spectre and Meltdown mitigation detection tool v0.32 Checking for vulnerabilities on current system Kernel is Linux 4.14.14-300.fc27.x86_64 #1 SMP Fri Jan 19 13:19:54 UTC 2018 x86_64 CPU is Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz Hardware check * Hardware support (CPU microcode) for mitigation techniques * Indirect Branch Restricted Speculation (IBRS) * SPEC_CTRL MSR is available: NO * CPU indicates IBRS capability: NO * Indirect Branch Prediction Barrier (IBPB) * PRED_CMD MSR is available: NO * CPU indicates IBPB capability: NO * Single Thread Indirect Branch Predictors (STIBP) * SPEC_CTRL MSR is available: NO * CPU indicates STIBP capability: NO * Enhanced IBRS (IBRS_ALL) * CPU indicates ARCH_CAPABILITIES MSR availability: NO * ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: NO * CPU explicitly indicates not being vulnerable to Meltdown (RDCL_NO): NO * CPU vulnerability to the three speculative execution attacks variants * Vulnerable to Variant 1: YES * Vulnerable to Variant 2: YES * Vulnerable to Variant 3: YES CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1' * Mitigated according to the /sys interface: NO (kernel confirms your system is vulnerable) > STATUS: VULNERABLE (Vulnerable) CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2' * Mitigated according to the /sys interface: YES (kernel confirms that the mitigation is active) * Mitigation 1 * Kernel is compiled with IBRS/IBPB support: NO * Currently enabled features * IBRS enabled for Kernel space: NO * IBRS enabled for User space: NO * IBPB enabled: NO * Mitigation 2 * Kernel compiled with retpoline option: YES * Kernel compiled with a retpoline-aware compiler: YES (kernel reports full retpoline compilation) * Retpoline enabled: YES > STATUS: NOT VULNERABLE (Mitigation: Full generic retpoline) CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3' * Mitigated according to the /sys interface: YES (kernel confirms that the mitigation is active) * Kernel supports Page Table Isolation (PTI): YES * PTI enabled and active: YES * Running as a Xen PV DomU: NO > STATUS: NOT VULNERABLE (Mitigation: PTI) A false sense of security is worse than no security at all, see --disclaimer [g.cecchi@ope46 spectre_meltdown]$ BTW: I updated some days ago this laptop from F26 to F27 and I remember Variant 1 was fixed in F26, while now I see it as vulnerable..... I'm going to check with Fedora mailing list about this... Another question: what should I see for a VM instead related to meltdown/spectre? Currently in "Guest CPU Type" in General subtab of the VM I only see "Westmere".. Should I also see anythin aout IBRS, etc...? Thanks, Gianluca

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Ovirt 4.2 - Help adding VM to numa node via python SDK
by Don Dupuis 26 Jan '18

26 Jan '18

I am able to create a vm using the sdk with nic and disks using the python sdk, but having trouble understanding how to assign it to virtual numanode onto the physical numanode via python sdk. Any help in this area would be greatly appreciated Thanks Don

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Windows 2012R2 virtio-scsi abysmal disk write performance
by Jean-Francois Courteau 26 Jan '18

26 Jan '18

Hello there, I just installed oVirt on brend new machines. The engine on a Virtualbox VM in my current infrastructure, and a single dedicated CentOS host attached to the engine. Here are my host specs (srvhc02): CPU: Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz (4C 8T) Mem: 32GB DDR3 Disks: - 2 x WD Black 2TB (RAID1) where the CentOS is installed - 4 x WD Gold 4TB (RAID10) dedicated for a storage domain (/dev/md0, ext4, mounted in /storage and exported with NFS with default settings) NIC: Intel 4 ports Gigabit. One port for VMs, one port for everything else. 2 unused ports. OS: Freshly installed CentOS 7 minimal latest (yum updated) oVirt deployed from the Engine using root account with a password Here are my Engine specs (srvvmmgmt): Virtualbox guest VM in another physical computer just for test purposes. CPU: 2vCPU Mem: 8GB Disk: 50GB VDI on a RAID10 array NIC: Virtual Intel Pro 1000 (Bridged over a physical Intel 4 ports Gigabit) OS: Freshly installed CentOS 7 minimal latest (yum updated) oVirt Engine 4.2 deployed from the repo, yum updated yesterday Storage domain: NFS - srvhc02:/storage ISO domain: NFS - srvhc02:/iso Physical network is Gigabit on Cisco switches, no VLAN tagging. My (barely usable) Windows 2012R2 guest (srvweb03) CPU: 2vCPU Mem: 8GB Disk1: 100GB on the storage domain Disk 2: 200GB on the storage domain (this is the one I was changing the controller for testing purposes) NIC: virtio bridged over the VM port I have tried every possible combination of drive controller (virtio-scsi, virtio, IDE), virtio drivers (stable and latest from the Fedora website, others found in sometimes obsucre places), and the disk write performances are simply unacceptable. Of course I had a reboot between each NIC driver update and driver change. I have compared with a Virtualbox installed on the same host after I cleaned up oVirt, and the host is absolutely not problematic. Here is the compare: oVirt Virtualbox ----------------------------------------------- SEQUENTIAL READ 3000MB/s 406MB/s (this is ridiculously high, oVirt probably reading from RAM) SEQUENTIAL WRITE 31MB/s 164MB/s 4k RANDOM READ 400MB/s 7.18MB/s (this is ridiculously high, oVirt probably reading from RAM) 4k RANDOM WRITE 0.3MB/s(80IOPS) 3MB/s (747IOPS) These performances are using the virtio-scsi in oVirt (any version, none gave me better performance), and the SATA driver in Virtualbox. Needless to say that this is frustrating. I have tried with oVirt virtio-blk (virtio in the interface) driver, it gave me a 10-15% improvement, but never up to the level I could expect from an enterprise grade solution. I also tried IDE. I could not even write at 10kbps on it. I had approx 10IOPM (yes, IO per minute!) with it. Is there something I am missing? -- https://nexcess.ca JEAN-FRANÇOIS COURTEAU _Président, Directeur Général_ C: jean-francois.courteau(a)nexcess.ca T: +1 (418) 558-5169 -------------------------

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Storage Hardware for Hyperconverged oVirt: Gluster best practice
by ovirt＠fateknollogee.com 26 Jan '18

26 Jan '18

oVirt + Gluster (hyperconverged) RAID question: I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM (boot drive for o/s install) and 6x 1TB SSD (to be used for Gluster). For the SSDs, is hardware or software RAID preferred or do I use an HBA? The RedHat docs seem to suggest hardware RAID, others on the forum say HBA or software RAID. What are other folks using?

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