Il 29-08-2017 13:28 Steven Whitehouse ha scritto:
There is no siginificant overhead when reading the same file on
multiple nodes. The overhead mostly applies when writes are involved
in some form, whether mixed with other writes or reads. GFS2 does
ensure cache coherency, but in order to do that
Hi,
On 29/08/17 12:26, Gionatan Danti wrote:
Il 29-08-2017 13:13 Steven Whitehouse ha scritto:
Whatever kind of storage is being used with GFS2, it needs to act as
if there was no cache or as if there is a common cache between all
nodes - what we want to avoid is caches which are specific to
Il 29-08-2017 13:13 Steven Whitehouse ha scritto:
Whatever kind of storage is being used with GFS2, it needs to act as
if there was no cache or as if there is a common cache between all
nodes - what we want to avoid is caches which are specific to each
node. Using individual node caching will
Hi,
On 29/08/17 12:07, Gionatan Danti wrote:
Il 29-08-2017 12:59 Steven Whitehouse ha scritto:
Yes, it definitely needs to be set to cache=none mode. Barrier passing
is only one issue, and as you say it is down to the cache coherency,
since the block layer is not aware of the caching
Il 29-08-2017 12:59 Steven Whitehouse ha scritto:
Yes, it definitely needs to be set to cache=none mode. Barrier passing
is only one issue, and as you say it is down to the cache coherency,
since the block layer is not aware of the caching requirements of the
upper layers in this case.
Ok.
On 29/08/17 11:54, Gionatan Danti wrote:
Hi Steven,
Il 29-08-2017 11:45 Steven Whitehouse ha scritto:
Yes, there is some additional overhead due to the clustering. You can
however usually organise things so that the overheads are minimised as
you mentioned above by being careful about the
Hi Steven,
Il 29-08-2017 11:45 Steven Whitehouse ha scritto:
Yes, there is some additional overhead due to the clustering. You can
however usually organise things so that the overheads are minimised as
you mentioned above by being careful about the workload.
No. You want to use the default
Hi,
On 26/08/17 07:11, Gionatan Danti wrote:
Hi list,
I am evaluating how to refresh my "standard" cluster configuration and
GFS2 clearly is on the table ;)
GOAL: to have a 2-node HA cluster running DRBD (active/active), GFS2
(to store disk image) and KVM (as hypervisor). The cluster had
Il 26-08-2017 11:34 Kristián Feldsam ha scritto:
Hello, accroding to red hat documentation "smaller is better". I
personaly use 1TB volumes with 256MB journal
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/Global_File_System_2/index.html#s1-formatting-gfs2
Hello, accroding to red hat documentation "smaller is better". I personaly use
1TB volumes with 256MB journal
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/Global_File_System_2/index.html#s1-formatting-gfs2
S pozdravem Kristián Feldsam
Tel.: +420 773 303
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