similar to: Free space cache writeback issue

On Fri, Feb 17, 2017 at 02:52:06PM +0100, Gionatan Danti wrote: >Hi all, >I write about libvirt inconsistent behavior when mixing io=native and >cache=writeback. This post can be regarded as an extension, or >clarification request, of BZ 1086704 >(https://bugzilla.redhat.com/show_bug.cgi?id=1086704) > >On a fully upgraded CentOS6 x86-64 machine, starting a guest with

Hi list, I would like to understand if, and why, the --unsafe flag is needed when using --copy-storage-all when migrating guests which uses writeback cache mode. Background: I want to live migrate guests with writeback cache from host A to host B and these hosts only have local storage (ie: no shared storage at all). From my understanding, --unsafe should be only required when migrating

On Fri, Feb 17, 2017 at 12:33:28 +0100, Gionatan Danti wrote: > Hi list, > I would like to understand if, and why, the --unsafe flag is needed when > using --copy-storage-all when migrating guests which uses writeback > cache mode. > > Background: I want to live migrate guests with writeback cache from host > A to host B and these hosts only have local storage (ie: no

Howdy. I'm trying to get OpenSSH to work on Mac OS X which is basically BSD unix. I'm getting segfaults connecting to SSH1 servers (I have no SSH2 servers to test against so I'm not sure if it's common). I've followed the instructions on compiling at http://www.stepwise.com/Articles/Workbench/2001-03-21.01.html which essentially amount to ./configure

On 17/02/2017 19:50, Jiri Denemark wrote: > > Yeah storage migration should be safe regardless of the cache mode used. > Very good news, thanks. Let me be paranoid: is it *surely* safe? > > This looks like a bug in libvirt. The code doesn't check whether an > affected disk is going to be migrated (--copy-storage-all) or accessed > on the shared storage. > > Jirka

Hi all, I write about libvirt inconsistent behavior when mixing io=native and cache=writeback. This post can be regarded as an extension, or clarification request, of BZ 1086704 (https://bugzilla.redhat.com/show_bug.cgi?id=1086704) On a fully upgraded CentOS6 x86-64 machine, starting a guest with io=native and cache=writeback is permitted: no errors are raised and the VM (qemu, really)

On Tue, Jul 03, 2012 at 03:19:37PM +0200, Paolo Bonzini wrote: > This patch adds support for the new VIRTIO_BLK_F_CONFIG_WCE feature, > which exposes the cache mode in the configuration space and lets the > driver modify it. The cache mode is exposed via sysfs. > > Even if the host does not support the new feature, the cache mode is > visible (thanks to the existing

On Tue, Jul 03, 2012 at 03:19:37PM +0200, Paolo Bonzini wrote: > This patch adds support for the new VIRTIO_BLK_F_CONFIG_WCE feature, > which exposes the cache mode in the configuration space and lets the > driver modify it. The cache mode is exposed via sysfs. > > Even if the host does not support the new feature, the cache mode is > visible (thanks to the existing

No, that will make it even worse since you'll be declaring a lot more memory that you actually have. The real problem is that you're ignoring the truncation, so you probably want to use something like if (snprintf(tempname, sizeof(tempname), "%s.%d", of1name, j) >= sizeof(tempname)) Rf_error("file name is too long"); BTW: most OSes systems have a path limits that

On Thu, May 30, 2019 at 7:21 PM Simon Urbanek <simon.urbanek at r-project.org> wrote: > > No, that will make it even worse since you'll be declaring a lot more memory that you actually have. > > The real problem is that you're ignoring the truncation, so you probably want to use something like > > if (snprintf(tempname, sizeof(tempname), "%s.%d", of1name,

Well, I had the first use of the recovery mode on the RH 8.0 install CD today on a dev system. I changed the mount option for the root partition to data=writeback to see what all the claimed speed increases are about, and the system failed to mount the partition r/w, so the resulting boot failed. After search usenet, it seems other RH folks have had this problem, possibly because it is

I'm trying to enable writeback mode for the root partition. However, adding the normal option "rootflags=data=writeback" to my grub.conf kernel line doesn't result in writeback mode (according to `dmesg`). Does anyone know of a way to enable this? -Doug -- Douglas E. Warner <dwarner at ctinetworks.com> Network Engineer CTI Networks, Inc.

The new xfstests will run fsck against the volume to make sure we didn''t introduce any inconsistencies, which is nice except we will error out immediately if we mount with inode_cache. We need to make btrfsck skip the special free space cache items and then just assume that we have a link for the free space cache inode item. This makes btrfsck pass with success on a fs with inode cache

Hello, I read some threads (some of them not very recent, and perhaps not up to date) and I have not found a clear answer to these: Is it advisable to have /tmp set up with data=writeback option in general? Is it again true if we are considering a laptop? Do I have also to consider writecache of disks in this case or are they totally non related? How to check/set the state of writecache for

I have many "sample" datasets (e.g. sample 5, sample 6, etc), each identified by a number as a suffix. These datasets are saved as individual R objects on my hard drive. (e.g."Wind.5.r" . "Wind.6.r","Solar.5.r","Solar.6.r") For example purposes, I have written code that creates similar data files using the "airquality" dataset. (see

Hi everybody, I had a problem which you may be interested in. I set data=writeback in /etc/fstab for each of my ext3 partitions (because it complains on "mount -o remount,data=writeback" with "ext3: journal mode can't be altered on remount" or similar) and rebooted. Problem: / was mounted read-only, I couldn't remount it (because mount appends the options from fstab,

I'm trying to increase the performance of an NFS server running Red Hat Linux 7.3 and using ext3. This server sees hefty read & write activity and I've been getting a lot of complaints that writing to the disks is taking a long time. The hardware is ample (Dell PE 2650 with 2x2.4GHz Xeons, 6GB RAM, PERC3-DC RAID controller & attached PowerVault 220S) and network connectivity

The writeback code uses an empty implementation for its encoder. Replace the code with the generic simple encoder. Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de> --- drivers/gpu/drm/drm_writeback.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c index 43d9e3bb3a94..cefb500c4ed7

Hi again, I realised it is useful to replicate the warnings locally without relying on CRAN automatic check; instead of R(-devel) CMD check --as-cran package_version.tar.gz one can use R CMD check --configure-args="" and in my case the WARNINGS were initially given with https://www.stats.ox.ac.uk/pub/bdr/gcc9/README.txt and those specification might as well used in --configure-args

From: Liu Bo <liubo2009@cn.fujitsu.com> When the filesystem is readonly, commit transaction is forbiddened. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> --- fs/btrfs/transaction.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index