Of course when you use multiple layers like VDO + software raid (for example) + LVM , the simple fstab doesn't deal properly with it - so I just remove bricks from fstab and put them in systemd mount units.
[root@ovirt ~]# systemctl cat gluster_bricks-largedata.mount --no-pager
# /etc/systemd/system/gluster_bricks-largedata.mount
[Unit]
Description=Mount glusterfs brick
Before = glusterd.service
Conflicts = umount.target
[Mount]
What=/dev/gluster_vg_largedata/largedata
Where=/gluster_bricks/largedata
Type=xfs
Options=noatime,inode64,nouuid,context="system_u:object_r:glusterd_brick_t:s0"
[Install]
WantedBy=glusterd.service
You can use the options in /etc/fstab.
For example if you mount your brick at /gluster/brick-1 your mount unit will be (don't forget to add '.mount' to the output of systemd-escape):
[root@ovirt ~]# systemd-escape -p /gluster/brick-1/
gluster-brick\x2d1
[root@ovirt ~]#
Best Regards,
Strahil Nikolov
On Tue, Apr 5, 2022 at 16:47, Olaf Buitelaar<olaf.buitelaar@xxxxxxxxx> wrote:Hi Strahil,interesting, would you happen to know how you could let oVirt mount it with this flag?Thanks OlafOp ma 4 apr. 2022 om 22:05 schreef Strahil Nikolov <hunter86_bg@xxxxxxxxx>:* it instructs the kernel to skip 'getfattr'
On Mon, Apr 4, 2022 at 23:04, Strahil Nikolov<hunter86_bg@xxxxxxxxx> wrote:I agree. Also it has a typo.Obviously I needed more coffee or a bigger break.It should be treated as 'relatime/noatime reduce the ammount of I/O requests to your brick physical device , which increases performance by reducing unnecessary IOPS'Same is valid for SELINUX's mount option:context="system_u:object_r:glusterd_brick_t:s0" . It instructs the kernel to 'getfattr' each file in the brick as it has a specific selinux context (this case Gluster brick files), thus reducing unnecessary IOPS.Best Regards,Strahil Nikolov
On Mon, Apr 4, 2022 at 9:41, Diego Zuccato<diego.zuccato@xxxxxxxx> wrote:Il 03/04/2022 16:36, Strahil Nikolov ha scritto:
> Using relative/noatime mount option reduces the I/O to the brick device.IMVHO this sentence could cause misunderstandings. :)
It could be read like "noatime slows down your brick" while, IIUC, it
really means it *improves* the brick's performance by reducing the
number of "housekeeping" IOs.
--
Diego Zuccato
DIFA - Dip. di Fisica e Astronomia
Servizi Informatici
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