similar to: [PATCH] Don't use cache=off if device is on tmpfs

Hi, I've seen that in the past, libvirt couldn't start VMs when the disk image was stored on a file system that doesn't support direct I/O having the 'cache=none' configuration [0]. On the KubeVirt project, we have some storage tests on a particular provider which does just that - try to create / start a VM whose disk is on tmpfs and whose definition features

On Fri, Mar 27, 2020 at 12:31:07PM +0100, Miguel Duarte de Mora Barroso wrote: > Hi, > > I've seen that in the past, libvirt couldn't start VMs when the disk > image was stored on a file system that doesn't support direct I/O > having the 'cache=none' configuration [0]. > > On the KubeVirt project, we have some storage tests on a particular > provider

On Fri, Aug 07, 2020 at 04:43:12PM +0300, Nir Soffer wrote: > On Fri, Aug 7, 2020, 16:16 Richard W.M. Jones <rjones@redhat.com> wrote: > > I'm not sure if or even how we could ever do a robust O_DIRECT > > > > We can let the plugin an filter deal with that. The simplest solution is to > drop it on the user and require aligned requests. I mean this is very error

On Thu, Mar 07, 2019 at 02:38:38PM -0500, Andrea Arcangeli wrote: > On Thu, Mar 07, 2019 at 02:09:10PM -0500, Jerome Glisse wrote: > > I thought this patch was only for anonymous memory ie not file back ? > > Yes, the other common usages are on hugetlbfs/tmpfs that also don't > need to implement writeback and are obviously safe too. > > > If so then set dirty is

On Thu, Mar 07, 2019 at 02:38:38PM -0500, Andrea Arcangeli wrote: > On Thu, Mar 07, 2019 at 02:09:10PM -0500, Jerome Glisse wrote: > > I thought this patch was only for anonymous memory ie not file back ? > > Yes, the other common usages are on hugetlbfs/tmpfs that also don't > need to implement writeback and are obviously safe too. > > > If so then set dirty is

On Fri, Aug 07, 2020 at 07:53:13AM -0500, Eric Blake wrote: > >$ free -m; time ./nbdkit file /var/tmp/random fadvise=sequential cache=none --run 'qemu-img convert -n -p -m 16 -W $nbd "json:{\"file.driver\":\"null-co\",\"file.size\":\"1E\"}"' ; free -m ; cachestats /var/tmp/random > > Hmm - the -W actually says that qemu-img is

Currently, default behavior of O_DIRECT writes was allowing concurrent writing among nodes, no cluster coherency guaranteed (no EX locks was taken), it hurts buffered reads on other nodes by reading stale data from cache. The new mount option introduce a chance to choose two different behaviors for O_DIRECT writes: * coherency=full, as the default value, will disallow concurrent

We're using RMAN to back up our 9.2 RAC database to an OCFS v1 volume. We have an existing shell script that we use for copying files from disk to tape via tar, one file at a time. (Don't ask why. It's a legacy script. Long story.) We're tweaking this script to use --o_direct when tarring the file to tape and that seems to be working fine: # tape device is /dev/nst0 $ tar

Hello everyone, I am learning and evaluating a glusterfs for film/video editing facilities. Some major film/video editing realtime applications are using the O_DIRECT file access for video/audio data files. The GLFS client via fuse mechanism is disallow the open file with O_DIRECT flag. I made a little sample code for read a file with O_DIRECT flag, and tried open the files on GLFS volumes. It

Does samba 3.0.23c not support the use of O_DIRECT? When I try to open an smbmount'd file using O_DIRECT, I get EINVAL. I am able to use O_DIRECT with no problems on a block device and nfs mounts, so I know the kernel supports it. samba: 3.0.23c kernel: 2.6.9-42.0.3.EL (32-bit) I am using the below code for my test. smb fails on open(2). #include <fcntl.h> #include

On Fri, Aug 07, 2020 at 05:29:24PM +0300, Nir Soffer wrote: > On Fri, Aug 7, 2020 at 5:07 PM Richard W.M. Jones <rjones@redhat.com> wrote: > > These ones? > > https://www.redhat.com/archives/libguestfs/2020-August/msg00078.html > > No, we had a bug when copying image from glance caused sanlock timeouts > because of the unpredictable page cache flushes. > > We

Hi We currently use rsync for various jobs at our company. We are now looking at using it to create an offsite synchonised copy of an Oracle 10g RAC archive logs area. The source area is on Oracle OCFS filesystem. The OCFS filesystem requires all reads/writes to be performed with the O_DIRECT option, thus bypassing cache. Oracle provide an updated coreutils package which includes the

I have a server where we use tmpfs as a cache for temporary files used by a web application. But occasionally this tmpfs thinks it is full when it isn't. [root at flask-yellow tmpfs]# touch file touch: cannot touch `file': No space left on device [root at flask-yellow tmpfs]# df -k Filesystem 1K-blocks Used Available Use% Mounted on none 393216 19296

Wim, Below are two problems I found in testing the newly released ocfs version. Just for your information. Gr, Robert. - Copying of multiple files gives errors [oracle@prac01 test]$ cp --o_direct -R ./a2/* ./backup/a2/. cp: writing `./backup/a2/./ccdata.dbf.bck': Invalid argument cp: writing `./backup/a2/./ccindex.dbf': Invalid argument cp: writing `./backup/a2/./control02.ctl':

Hi, I am running the below command on CentOS Linux release 7.6.1810 (Core) # df -hT --total Filesystem Type Size Used Avail Use% Mounted on /dev/xvda1 xfs 150G 8.0G 143G 6% / devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev tmpfs tmpfs 7.8G 0 7.8G 0% /dev/shm tmpfs tmpfs 7.8G 817M 7.0G 11% /run tmpfs tmpfs 7.8G 0

On 10/22/19 7:04 AM, Leon Fauster via CentOS wrote: > Am 22.10.19 um 04:52 schrieb Orion Poplawski: >> On 10/21/19 3:42 PM, Leon Fauster via CentOS wrote: >>> Does someone have a working tmp on tmpfs via >>> >>> systemctl enable tmp.mount >>> >>> under CentOS8/RHEL8? This seems to work straight in EL7 ... >>> >>> >>>

On Sun, Aug 9, 2020 at 12:28 AM Richard W.M. Jones <rjones@redhat.com> wrote: > > On Sat, Aug 08, 2020 at 01:24:02AM +0300, Nir Soffer wrote: > > The new cache=none mode is misleading since it does not avoid usage of > > the page cache. When using shared storage, we may get stale data from > > the page cache. When writing, we flush after every write which is > >

Dear Sirs, I've a question belonging to the run-init utility. I'm trying to boot a full linux system from ram. Therefore I provide a kernel and initrd from a tftp server. The full rootfs is provided through a nfs-server and is at time a cpio-archive. That archive shall be copied to the local client and mounted in a tmpfs partition. After that, I want replace the oldroot bei the root

Dear all Recently, i did some work to test small files performance for gnfsv3 transport. Following is my scenario. #####environment##### ==2 cluster nodes(nodeA/nodeB)== each is equipped with E5-2650*2, 128G memory and 10GB*2 netcard nodeA: 10.254.3.77 10.128.3.77 nodeB: 10.254.3.78 10.128.3.78 ==2 stress nodes(clientA/clientB)== each is equipped with E5-2650*2, 128G memory and 10GB*2

Hi Leon, have you tried mounting with 'httpd_sys_rw_content_t' instead of 'httpd_var_run_t' ? Best Regards, Strahil Nikolov ?? 25 ??? 2020 ?. 14:20:19 GMT+03:00, Leon Fauster via CentOS <centos at centos.org> ??????: >Hi all, > >I have some AVC in the logs and wonder how to resolve this: Under >EL8 (enforcing SElinux) I have /var/lib/php/session mounted as