similar to: High iowait in dom0 after creating a new guest, with file-based domU disk on GFS

Hello, We have a 5 node OCFS2 volume backed by a Sun (Oracle) StorageTek 2540. Each system is running OEL5.4 and OCFS2 1.4.2, using device-mapper-multipath to load balance over 2 active paths. We are using the default multipath configuration for our SAN. We are observing iowait time between 60% - 90%, sustaining at over 80% as I'm writing this, driving load averages to >25 during an rsync

I did some additional testing - I stopped Kafka on the host, and kicked off a disk check, and it ran at the expected speed overnight. I started kafka this morning, and the raid check's speed immediately dropped down to ~2000K/Sec. I then enabled the write-back cache on the drives (hdparm -W1 /dev/sd*). The raid check is now running between 100000K/Sec and 200000K/Sec, and has been for several

Hi. I entered one of our domU tonight and see following problem: # iowait -k 5 avg-cpu: %user %nice %system %iowait %steal %idle 0.00 0.00 0.00 100.00 0.00 0.00 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0

Just came in from Bugzilla ... Subject: [Bug 121434] Extremely high iowait with 3Ware array and moderate disk activity https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=121434 ------- Additional Comments From thomas.oulevey at elonex.ch 2005-07-29 08:55 EST ------- Hello, About the Linux 2.4 driver, we realized that we have big problem with the 9.2 driver. The 9.1.5.2 was fine. In fact the

On 05/25/2016 09:54 AM, Kelly Lesperance wrote: > What we're seeing is that when the weekly raid-check script executes, performance nose dives, and I/O wait skyrockets. The raid check starts out fairly fast (20000K/sec - the limit that's been set), but then quickly drops down to about 4000K/Sec. dev.raid.speed sysctls are at the defaults: It looks like some pretty heavy writes are

All of our Kafka clusters are fairly write-heavy. The cluster in question is our second-heaviest ? we haven?t yet upgraded the heaviest, due to the issues we?ve been experiencing in this one. Here is an iostat example from a host within the same cluster, but without the RAID check running: [root at r2k1 ~] # iostat -xdmc 1 10 Linux 3.10.0-327.13.1.el7.x86_64 (r2k1) 05/27/16 _x86_64_ (32 CPU)

I?ve posted this on the forums at https://www.centos.org/forums/viewtopic.php?f=47&t=57926&p=244614#p244614 - posting to the list in the hopes of getting more eyeballs on it. We have a cluster of 23 HP DL380p Gen8 hosts running Kafka. Basic specs: 2x E5-2650 128 GB RAM 12 x 4 TB 7200 RPM SATA drives connected to an HP H220 HBA Dual port 10 GB NIC The drives are configured as one large

Hi, we have 2 servers on centos5.2 in a cluster with the redhat cman in the configuration SERVER1 > LVM \ CMAN DRBD > XEN SERVER2 > LVM / For each xen we create a new local LVM on each node, put them in a drbd and install an os (debian 4 or ubuntu 8). The xens are running as pvm. Everything works fine since over 4 months now. But we have some performance-Problems: Writing

I'm trying to get an Archlinux guest running on a Archlinux host. Everything works except ethernet. When I boot the host, --- # dmesg |tail [ 8.265493] Bridge firewalling registered [ 8.514547] IPv6: ADDRCONF(NETDEV_UP): virbr0: link is not ready [ 8.645303] ip6_tables: (C) 2000-2006 Netfilter Core Team --- Then I do --- # virsh -c lxc:/// start gitolite Domain gitolite started #

After running out of swap and memory and freezing, a domU called web02 won't start up. Both dom0 and domU are running CentOS release 5.4. dom0's kernel is 2.6.18-164.el5xen and I'm running the stock xen from CentOS: xen-3.0.3-94.el5 After issuing 'xen create web02' I see the following in the xen console: Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) vmalloc

Hi all, A client just phoned me and said he could not SSH into his VPS, yet he can ping it. So, I login to the host node, and check it out, can''t SSH into. I shutdown iptables on the VPS (via xm console serverza.vm) but still can''t SSH into it. I restart the VPS, still can''t SSH into it. So, I check the host, and found this in /var/log/messages: Jul 22 19:19:07

Hello List, i am running Debian Squeeze and i installed DRBD, 3.2.0-0.bpo.4-amd64 and Xen4.0 from the Backports. Sometimes i get such ugly Kernel message: [257318.441757] BUG: unable to handle kernel paging request at ffff880025f19000 Log: [256820.643918] xen-blkback:ring-ref 772, event-channel 16, protocol 1 (x86_64-abi) [256830.802492] vif86.0: no IPv6 routers present [256835.674481]

When starting xend i see the following errors on the console. I''m running CentOS 5 as the operating system with kernel 2.6.32.18 from 4.0.1''s `make prep-kernels` Below is a log, the things i''m concerned with is the XENBUS errors and the deprecated iptables stuff. Any ideas whats going on here? ---------------------------------------------------- Bridge

Greetings, I recently installed CentOS 5 on Dell PE 1750 server. I have noticed that the speed and duplex settings are 100 Half Duplex. I tried to change the duplex settings to full, but no success. I got the error message "Cannot get current device settings: Operation not supported". Does anyone else experience this issue?. Below is the error message and some more details about my box.

Dear all, I have installed DRBD 8.3.11 compiled from sources. However the backend block will freeze if there is high IO load. I use Remus to support high availability and checkpointing is controlled by remus for each 400ms. If I check the Iostat I got the idle CPU will decreasing extremely each checkpointing and when its reach 0% of idle cpu the local backing device will freeze and damage the

Dear Centos-Virt: Help! Guest=XP Pro, SP2 Host=CentOS5; # uname -r; 2.6.18-8.1.8.el5 VirtualBox-1.4.0_21864_rhel5-1.i586 http://www.virtualbox.org/download/1.5.0/VirtualBox-1.5.0_24069_rhel5-1.i586.rpm.run I have two nic: eth0 is the internal network; eth1 connects to a DSL modem. I also have a fully functioning DHCP server on eth0 (works perfectly with Parallels for Linux). The directions

hi all, i just found a bug from xapi code network_utils.ml: let is_physical name = try let link = Unix.readlink (getpath name "device") in (* filter out device symlinks which look like /../../../devices/xen-backend/vif- *) not(List.mem "xen-backend" (String.split ''/'' link)) with _ -> false i use xcp + ubuntu 12.04, in my /sys/class/net/ dir it

i just found a bug from xapi code network_utils.ml: let is_physical name = try let link = Unix.readlink (getpath name "device") in (* filter out device symlinks which look like /../../../devices/xen-backend/vif- *) not(List.mem "xen-backend" (String.split '/' link)) with _ -> false i use xcp + ubuntu 12.04, in my /sys/class/net/ dir it looks like:

Kelly Lesperance wrote: > I?ve posted this on the forums at > https://www.centos.org/forums/viewtopic.php?f=47&t=57926&p=244614#p244614 > - posting to the list in the hopes of getting more eyeballs on it. > > We have a cluster of 23 HP DL380p Gen8 hosts running Kafka. Basic specs: > > 2x E5-2650 > 128 GB RAM > 12 x 4 TB 7200 RPM SATA drives connected to an HP

Kelly Lesperance wrote: > I?ve posted this on the forums at > https://www.centos.org/forums/viewtopic.php?f=47&t=57926&p=244614#p244614 > - posting to the list in the hopes of getting more eyeballs on it. > > We have a cluster of 23 HP DL380p Gen8 hosts running Kafka. Basic specs: > > 2x E5-2650 > 128 GB RAM > 12 x 4 TB 7200 RPM SATA drives connected to an HP