similar to: Extremely high iowait

Hello, I'm writing from the otherside of the world from where my systems are, so details are coming in slow. We have a 6TB OCFS2 volume across 20 or so nodes all running OEL5.4 running ocfs2-1.4.4. The system has worked fairly well for the last 6-8 months. Something has happened over the last few weeks which has driven write performance nearly to a halt. I'm not sure how to proceed, and

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

Hopefully I summed up the jist of the problem in the subject line. ;) I have a GFS cluster with ten Xen 3.0 dom0s sharing an iSCSI LUN. There are on average 8 domUs running on each Xen server. The dom0 on each server is hard-coded to 2 CPUs and 2GB of RAM with no ballooning, and has 2GB of partition-based swap. When creating a new domU on any of the Xen servers, just after the completion of

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

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

[Cross-posting to ldoms-discuss] We are occasionally seeing massive time-to-completions for I/O requests on ZFS file systems on a Sun T5220 attached to a Sun StorageTek 2540 and a Sun J4200, and using a SSD drive as a ZIL device. Primary access to this system is via NFS, and with NFS COMMITs blocking until the request has been sent to disk, performance has been deplorable. The NFS server is a

Today I updated the firmware on my StorageTek 2540 to the latest recommended version and am seeing radically difference performance when testing with iozone than I did in February of 2008. I am using Solaris 10 U5 with all the latest patches. This is the performance achieved (on a 32GB file) in February last year: KB reclen write rewrite read reread 33554432

Hi Folks, I've used Samba in the past for Windows NT - Unix connectivity situations. I wondered if Samba also supported AS/400 - Unix connectivity, specifically to allow AS/400 to read/write to a Unix file system...?? Regards Ian Gill Principal Consultant Professional Services (+1) 727.784.4475 Office (+1) 727.784.1278 Fax (+1) 727.560.6710 Cell. Ian_Gill@StorageTek.com

Hi All :) I am currently involved in a project in which there is a SAN array (Sun Storagetek 2540) which exports LUNs for some servers with Centos 5.2 x86. I will be performing a migration to Centos 5.9 x86_64 in some time and am gathering needed info now :) I am trying to find the place in the OS where there is the information about LUN mappings to /dev/ devices. For example on array level I

CentOS Errata and Bugfix Advisory 2017:3331 Upstream details at : https://access.redhat.com/errata/RHBA-2017:3331 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: 69fc9b22238a59611f32208b88a8de0fdd845db32c0a35af014f0249fc39f818 mutter-3.22.3-12.el7_4.i686.rpm

CentOS Errata and Bugfix Advisory 2018:1980 Upstream details at : https://access.redhat.com/errata/RHBA-2018:1980 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: 38f631cf0e4b83f61395249e0410e027f7bd07aae581b3509cc70bfec57719e7 mutter-3.26.2-14.el7_5.i686.rpm

CentOS Errata and Bugfix Advisory 2018:2461 Upstream details at : https://access.redhat.com/errata/RHBA-2018:2461 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: c89fe529aea0b95e8eb7551a13d1bffecf11101a1dfe948c7cf0c06ee0b3668d mutter-3.26.2-15.el7_5.i686.rpm

CentOS Errata and Bugfix Advisory 2018:2765 Upstream details at : https://access.redhat.com/errata/RHBA-2018:2765 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: 810a57c42629bb2b631316c25d19cc1c4bd848026b73a96e2d04afaf2ae8ec78 mutter-3.26.2-17.el7_5.i686.rpm

CentOS Errata and Bugfix Advisory 2019:0523 Upstream details at : https://access.redhat.com/errata/RHBA-2019:0523 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: 298dcd5a015193a4963487c31c040d9df0f5e0761f49caaeefe720f245f67019 mutter-3.28.3-6.el7_6.i686.rpm

CentOS Errata and Bugfix Advisory 2019:0817 Upstream details at : https://access.redhat.com/errata/RHBA-2019:0817 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: 2e623a911e1729643bdc6d0e50b0f2ea3585c3fbccbd779073402b3a229e86ef mutter-3.28.3-7.el7_6.i686.rpm

CentOS Errata and Bugfix Advisory 2019:1892 Upstream details at : https://access.redhat.com/errata/RHBA-2019:1892 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: bb8ae6e18d7befc37b395538c02d06c870cf27818742a5b2f0444cec3ef331bc mutter-3.28.3-8.el7_6.i686.rpm