Re: Gluster Performance - 12 Gbps SSDs and 10 Gbps    NIC

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Only Replica 2 or Distributed Gluster volumes can be created with two servers. High chance of split brain with Replica 2 compared to Replica 3 volume.

For NFS Ganesha, no issue exporting the volume even if only one server is available. Run NFS Ganesha servers in Gluster server nodes and NFS clients from the network can connect to any NFS Ganesha server.

You can use Haproxy + Keepalived (or any other load balancer) if high availability required for the NFS Ganesha connections (Ex: If a server node goes down, then nfs client can connect to other NFS ganesha server node).

--
Aravinda
Kadalu Technologies



---- On Wed, 13 Dec 2023 01:42:11 +0530 Gilberto Ferreira <gilberto.nunes32@xxxxxxxxx> wrote ---

Ah that's nice.
Somebody knows this can be achieved with two servers?

---
Gilberto Nunes Ferreira
(47) 99676-7530 - Whatsapp / Telegram







Em ter., 12 de dez. de 2023 às 17:08, Danny <dbray925+gluster@xxxxxxxxx> escreveu:

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Wow, HUGE improvement with NFS-Ganesha!


sudo dnf -y install glusterfs-ganesha
sudo vim /etc/ganesha/ganesha.conf

NFS_CORE_PARAM {
    mount_path_pseudo = true;
    Protocols = 3,4;
}
EXPORT_DEFAULTS {
    Access_Type = RW;
}
 
LOG {
    Default_Log_Level = WARN;
}
 
EXPORT{
    Export_Id = 1 ;     # Export ID unique to each export
    Path = "/data";     # Path of the volume to be exported
 
    FSAL {
        name = GLUSTER;
        hostname = "localhost"; # IP of one of the nodes in the trusted pool
        volume = "data";        # Volume name. Eg: "test_volume"
    }
 
    Access_type = RW;           # Access permissions
    Squash = No_root_squash;    # To enable/disable root squashing
    Disable_ACL = TRUE;         # To enable/disable ACL
    Pseudo = "/data";           # NFSv4 pseudo path for this export
    Protocols = "3","4" ;       # NFS protocols supported
    Transports = "UDP","TCP" ;  # Transport protocols supported
    SecType = "sys";            # Security flavors supported
}


sudo systemctl enable --now nfs-ganesha
sudo vim /etc/fstab

localhost:/data             /data                 nfs    defaults,_netdev          0 0


sudo systemctl daemon-reload
sudo mount -a

fio --name=test --filename=/data/wow --size=1G --readwrite=write

Run status group 0 (all jobs):
  WRITE: bw=2246MiB/s (2355MB/s), 2246MiB/s-2246MiB/s (2355MB/s-2355MB/s), io=1024MiB (1074MB), run=456-456msec

Yeah 2355MB/s is much better than the original 115MB/s

So in the end, I guess FUSE isn't the best choice.

On Tue, Dec 12, 2023 at 3:00 PM Gilberto Ferreira <gilberto.nunes32@xxxxxxxxx> wrote:
Fuse there some overhead.
Take a look at libgfapi:

I know this doc somehow is out of date, but could be a hint


---
Gilberto Nunes Ferreira
(47) 99676-7530 - Whatsapp / Telegram







Em ter., 12 de dez. de 2023 às 16:29, Danny <dbray925+gluster@xxxxxxxxx> escreveu:
Nope, not a caching thing. I've tried multiple different types of fio tests, all produce the same results. Gbps when hitting the disks locally, slow MB\s when hitting the Gluster FUSE mount.

I've been reading up on glustr-ganesha, and will give that a try.

On Tue, Dec 12, 2023 at 1:58 PM Ramon Selga <ramon.selga@xxxxxxxxx> wrote:
Dismiss my first question: you have SAS 12Gbps SSDs  Sorry!

El 12/12/23 a les 19:52, Ramon Selga ha escrit:
May ask you which kind of disks you have in this setup? rotational, ssd SAS/SATA, nvme?

Is there a RAID controller with writeback caching?

It seems to me your fio test on local brick has a unclear result due to some caching.

Try something like (you can consider to increase test file size depending of your caching memory) :

fio --size=16G --name=test --filename=/gluster/data/brick/wow --bs=1M --nrfiles=1 --direct=1 --sync=0 --randrepeat=0 --rw=write --refill_buffers --end_fsync=1 --iodepth=200 --ioengine=libaio

Also remember a replica 3 arbiter 1 volume writes synchronously to two data bricks, halving throughput of your network backend.

Try similar fio on gluster mount but I hardly see more than 300MB/s writing sequentially on only one fuse mount even with nvme backend. On the other side, with 4 to 6 clients, you can easily reach 1.5GB/s of aggregate throughput

To start, I think is better to try with default parameters for your replica volume.

Best regards!

Ramon

 
El 12/12/23 a les 19:10, Danny ha escrit:
Sorry, I noticed that too after I posted, so I instantly upgraded to 10. Issue remains.

On Tue, Dec 12, 2023 at 1:09 PM Gilberto Ferreira <gilberto.nunes32@xxxxxxxxx> wrote:
I strongly suggest you update to version 10 or higher. 
It's come with significant improvement regarding performance.
---
Gilberto Nunes Ferreira
(47) 99676-7530 - Whatsapp / Telegram






Em ter., 12 de dez. de 2023 às 13:03, Danny <dbray925+gluster@xxxxxxxxx> escreveu:
MTU is already 9000, and as you can see from the IPERF results, I've got a nice, fast connection between the nodes.

On Tue, Dec 12, 2023 at 9:49 AM Strahil Nikolov <hunter86_bg@xxxxxxxxx> wrote:
Hi,

Let’s try the simple things:

Check if you can use MTU9000 and if it’s possible, set it on the Bond Slaves and the bond devices:
 ping GLUSTER_PEER -c 10 -M do -s 8972
Strahil Nikolov 

On Monday, December 11, 2023, 3:32 PM, Danny <dbray925+gluster@xxxxxxxxx> wrote:

Hello list, I'm hoping someone can let me know what setting I missed.

Hardware:
Dell R650 servers, Dual 24 Core Xeon 2.8 GHz, 1 TB RAM
8x SSD s Negotiated Speed 12 Gbps
PERC H755 Controller - RAID 6
Created virtual "data" disk from the above 8 SSD drives, for a ~20 TB /dev/sdb

OS:
CentOS Stream
kernel-4.18.0-526.el8.x86_64
glusterfs-7.9-1.el8.x86_64

IPERF Test between nodes:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  11.5 GBytes  9.90 Gbits/sec    0             sender
[  5]   0.00-10.04  sec  11.5 GBytes  9.86 Gbits/sec                  receiver

All good there. ~10 Gbps, as expected.

LVM Install:
export DISK="/dev/sdb"
sudo parted --script $DISK "mklabel gpt"
sudo parted --script $DISK "mkpart primary 0% 100%"
sudo parted --script $DISK "set 1 lvm on"
sudo pvcreate --dataalignment 128K /dev/sdb1
sudo vgcreate --physicalextentsize 128K gfs_vg /dev/sdb1
sudo lvcreate -L 16G -n gfs_pool_meta gfs_vg
sudo lvcreate -l 95%FREE -n gfs_pool gfs_vg
sudo lvconvert --chunksize 1280K --thinpool gfs_vg/gfs_pool --poolmetadata gfs_vg/gfs_pool_meta
sudo lvchange --zero n gfs_vg/gfs_pool
sudo lvcreate -V 19.5TiB --thinpool gfs_vg/gfs_pool -n gfs_lv
sudo mkfs.xfs -f -i size=512 -n size=8192 -d su=128k,sw=10 /dev/mapper/gfs_vg-gfs_lv
sudo vim /etc/fstab
/dev/mapper/gfs_vg-gfs_lv   /gluster/data/brick   xfs       rw,inode64,noatime,nouuid 0 0

sudo systemctl daemon-reload && sudo mount -a
fio --name=test --filename=/gluster/data/brick/wow --size=1G --readwrite=write

Run status group 0 (all jobs):
  WRITE: bw=2081MiB/s (2182MB/s), 2081MiB/s-2081MiB/s (2182MB/s-2182MB/s), io=1024MiB (1074MB), run=492-492msec

All good there. 2182MB/s =~ 17.5 Gbps. Nice!


Gluster install:
export NODE1='10.54.95.123'
export NODE2='10.54.95.124'
export NODE3='10.54.95.125'
sudo gluster peer probe $NODE2
sudo gluster peer probe $NODE3
sudo gluster volume create data replica 3 arbiter 1 $NODE1:/gluster/data/brick $NODE2:/gluster/data/brick $NODE3:/gluster/data/brick force
sudo gluster volume set data network.ping-timeout 5
sudo gluster volume set data performance.client-io-threads on
sudo gluster volume set data group metadata-cache
sudo gluster volume start data
sudo gluster volume info all

Volume Name: data
Type: Replicate
Volume ID: b52b5212-82c8-4b1a-8db3-52468bc0226e
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x (2 + 1) = 3
Transport-type: tcp
Bricks:
Brick1: 10.54.95.123:/gluster/data/brick
Brick2: 10.54.95.124:/gluster/data/brick
Brick3: 10.54.95.125:/gluster/data/brick (arbiter)
Options Reconfigured:
network.inode-lru-limit: 200000
performance.md-cache-timeout: 600
performance.cache-invalidation: on
performance.stat-prefetch: on
features.cache-invalidation-timeout: 600
features.cache-invalidation: on
network.ping-timeout: 5
transport.address-family: inet
storage.fips-mode-rchecksum: on
nfs.disable: on
performance.client-io-threads: on

sudo vim /etc/fstab
localhost:/data             /data                 glusterfs defaults,_netdev      0 0

sudo systemctl daemon-reload && sudo mount -a
fio --name=test --filename=/data/wow --size=1G --readwrite=write

Run status group 0 (all jobs):
  WRITE: bw=109MiB/s (115MB/s), 109MiB/s-109MiB/s (115MB/s-115MB/s), io=1024MiB (1074MB), run=9366-9366msec

Oh no, what's wrong? From 2182MB/s down to only 115MB/s? What am I missing? I'm not expecting the above ~17 Gbps, but I'm thinking it should at least be close(r) to ~10 Gbps.

Any suggestions?
________



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Gluster-users mailing list
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________



Community Meeting Calendar:

Schedule -
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Gluster-users mailing list
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________



Community Meeting Calendar:

Schedule -
Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC
Bridge: https://meet.google.com/cpu-eiue-hvk
Gluster-users mailing list
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________



Community Meeting Calendar:

Schedule -
Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC
Bridge: https://meet.google.com/cpu-eiue-hvk
Gluster-users mailing list
Gluster-users@xxxxxxxxxxx
https://lists.gluster.org/mailman/listinfo/gluster-users
________



Community Meeting Calendar:

Schedule -
Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC
Bridge: https://meet.google.com/cpu-eiue-hvk
Gluster-users mailing list
Gluster-users@xxxxxxxxxxx
https://lists.gluster.org/mailman/listinfo/gluster-users

________



Community Meeting Calendar:

Schedule -
Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC
Bridge: https://meet.google.com/cpu-eiue-hvk
Gluster-users mailing list
Gluster-users@xxxxxxxxxxx
https://lists.gluster.org/mailman/listinfo/gluster-users
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