similar to: [PATCH] blktrace: document -k option

I keep reading that RHEL/CentOS 5 supports blktrace, but I can't seem to find the blktrace/blkparse utilities. Is it that just the functionality is available in the kernel, but the user is left to have to hunt down the latest versions of the utilities on the net? If anybody knows where to get the latest versions of these utilities I would greatly appreciate it. Ross S. W. Walker

Hi, The following patch adds ioprio to blktrace. Explanation: As you know, I/O schedulers such as cfq use io_contexts of current tasks to schedule block I/O. But recently, some are suggesting to use more appropriate io_contexts obtained by, for example, doing io-tracking, making struct bio have io_context member, etc. I thought adding ioprio to blktrace output might be helpful. Implementation:

Ok, I got blktrace installed, but I also have some blktrace system taps that I want to test out, but it seems I need to have the kernel debug info installed to get systemtap working. Anyone know where the CentOS kernel-debuginfo RPMs are located? Ross S. W. Walker Information Systems Manager Medallion Financial, Corp. 437 Madison Avenue 38th Floor New York, NY 10022 Tel: (212) 328-2165 Fax:

Today, I had to uncleanly shutdown one of our machines due to an error in 2.6.28.3. Durin the boot sequence, the ext4 partition /home experienced a journal replay. /home looks like this: /dev/mapper/volg1-logv1 on /home type ext4 (rw,noexec,nodev,noatime,errors=remount-ro) Filesystem Size Used Avail Use% Mounted on /dev/mapper/volg1-logv1 2,4T 1,4T 1022G 58% /home Filesystem

Hi, this is about an issue newer kernels show, bysplitting direct I/O requests into 4k pieces to directly merge them in the Block Device Layer afterwards. If anyone is interested in own tests just use a simple command like dd if=/mnt/test/test-dd1 of=/dev/null iflag=direct bs=64k count=1 in combination with blktrace. The following patch is more a proposal for discussion than a solution, well

Hi, the $subj warning appears sometimes in syslog, in my case when xfstests/209 runs looped. The minimal reproducer is looped mkfs+mount. The message comes from disk-io.c btree_readpage_end_io_hook(): 581 if (check_tree_block_fsid(root, eb)) { 582 printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n", 583 (unsigned long

Hello. Sorry for writing to btrfs mailing list, but personal mail reject my message. Saying " <chris.mason@fusionio.com>: host 10.101.1.19[10.101.1.19] said: 554 5.4.6 Hop count exceeded - possible mail loop (in reply to end of DATA command) Final-Recipient: rfc822; chris.mason@fusionio.com Action: failed Status: 5.0.0 Diagnostic-Code: X-Spam-&-Virus-Firewall; host

On Fri, May 21, 2010 at 15:37:45AM -0400, Josef Bacik wrote: > On Fri, May 21, 2010 at 11:21:11AM -0400, Christoph Hellwig wrote: >> On Wed, May 19, 2010 at 04:24:51PM -0400, Josef Bacik wrote: >> > Btrfs cannot handle having logically non-contiguous requests submitted. For >> > example if you have >> > >> > Logical: [0-4095][HOLE][8192-12287]

Dear All, I am trying to trace all the disk I/O accesses made by the xen guest domains to dom0 domain. I would request for critics or comments in doing the same. Its easy to run "iostat -x" on all domains and dom0 to get the disk i/o utilization stats, but I am just looking if there can be any other way than running this utility in all domUs but using simply dom0 to get all guest

On Mar 16, 2010, at 3:43 AM, Lennert Buytenhek <buytenh at wantstofly.org> wrote: > Hi! > > On two different machines, I've been experiencing disk I/O stalls > after > upgrading to the CentOS 5.4 kernel. Both machines have an LSI 1068E > MPT SAS (mptsas) controller connected to a Chenbro CK13601 36-port SAS > expander, with one machine having 16 1T WD disks

Hello, When approaching hosting providers for services, the first question many of them asked us was about the amount of IOPS the disk system should support. While we stress-tested our service, we recorded between 4000 and 6000 "merged io operations per second" as seen in "iostat -x" and collectd (varies between the different components of the system, we have a few such

I'm trying to do an fsck on an ext3 partition but I'm seeing abysmally slow disk throughput; monitoring with "dstat" (like vmstat) shows ~1200-1500KB/s throughput to the disks. Even with 24hrs of fsck-ing I only get ~3% (still in pass1). The filesystem is ext3 running "e2fsck -C0 /dev/sda3" and about 3.7TB on an x86_64-based system with 4GB RAM. e2fsprogs is 1.41.9.

Andrew, can you please send this on to Linus and -stable ASAP? It's causing massive problems for our users. On Thu, Aug 12, 2010 at 04:50:59PM -0400, Jeff Moyer wrote: > Hi, > > commit c2c6ca4 (direct-io: do not merge logically non-contiguous > requests) introduced a bug whereby all O_DIRECT I/Os were submitted a > page at a time to the block layer. The problem is that the

Hi all, we got a new test system here and I just also tested btrfs raid6 on that. Write performance is slightly lower than hw-raid (LSI megasas) and md-raid6, but it probably would be much better than any of these two, if it wouldn''t read all the during the writes. Is this a known issue? This is with linux-3.9.2. Thanks, Bernd -- To unsubscribe from this list: send the line

Hello, I've used pungi with the following configuration: repo --name=centos-base --baseurl=ftp://mirrors/centos/6/os/x86_64 --cost=1 -- excludepkgs=qemu-kvm repo --name=centos-updates --baseurl=ftp://mirrors/centos/6/updates/x86_64 -- cost=1 --excludepkgs=qemu-kvm repo --name=xen4centos -- baseurl=http://mirror.centos.org/centos/6/xen4/x86_64/ --cost=1 %packages @base @core

I have samba 3.0.8, as a member of 2000AD and 2003AD. I would like to get groups and the members in each group. The purpose is to maintain a set of Filtering profiles on squidGuard that are based on AD groups. I will have a script that reads a config file with the groupnames to fetch from Active Directory and a Precedence order to set them in. One of the groups will be designated "a NO

Not sure how this happened, but filter.btrfs including itself leads to immense sadness for any file that includes it. (I got a segfault when I tried to run 307) Signed-off-by: Eric Sandeen <sandeen@redhat.com> --- diff --git a/common/filter.btrfs b/common/filter.btrfs index b1aa733..99d04a6 100644 --- a/common/filter.btrfs +++ b/common/filter.btrfs @@ -1,7 +1,5 @@ # Filters for btrfs

Hi, just FYI :) ----- Forwarded message from Eric Sandeen <sandeen@sgi.com> ----- Date: Fri, 11 Mar 2005 11:17:13 -0600 From: Eric Sandeen <sandeen@sgi.com> User-Agent: Mozilla Thunderbird 1.0 (X11/20041206) To: "''linux-xfs@oss.sgi.com''" <linux-xfs@oss.sgi.com> Subject: RHEL3-compatible kernels w/ xfs and other goodies Hi gang - Just a quick

On Oct 17, 2014, at 1:30 PM, "H. Peter Anvin" <hpa at zytor.com> wrote: > >> On 10/17/2014 12:19 AM, Ferenc Wagner wrote: >> "H. Peter Anvin" <hpa at zytor.com> writes: >> >>> I would like to do a short cycle for 6.04, because 64-bit support for >>> ext4 has come up as a very high priority. Therefore I do not want to

Josh Coalson wrote: > --- Eric Sandeen <sandeen@sandeen.net> wrote: > >>1) how to generate a cue sheet to store in the flac file (on linux?) >> I've seen cddb2cue, is this a decent way? or cdrdao can generate >> a toc file, then convert that to a cue sheet.... > > > I think whatever provides cdrdao also provides toc2cue which > will convert.