| Hi all, sorry for 2 threads today, but I felt like this deserved a separate thread… I was trying to replace my replica 2 volumes with replica 3 arbiter 1 volumes… The new volumes though are 10x slower on direct writes than their replica 2 counterparts. Im wondering if this is to be expected or if I might have done something wrong? I confirmed that no data is being written into the arbiter bricks, just meta data. Here’s the tests I ran. I did the dd tests multiple times with different file names, and they all had the same speeds …. [root@fs134 wtg002]# dd if=/dev/zero of=test bs=1M count=100 oflag=direct 100+0 records in 100+0 records out 104857600 bytes (105 MB) copied, 9.49974 s, 11.0 MB/s [root@fs134 wtg002]# cd .. [root@fs134 home]# cd wtg001 [root@fs134 wtg001]# dd if=/dev/zero of=test bs=1M count=100 oflag=direct 100+0 records in 100+0 records out 104857600 bytes (105 MB) copied, 0.888929 s, 118 MB/s [root@fs134 wtg001]# gluster volume info wtg001 Volume Name: wtg001 Type: Distributed-Replicate Volume ID: 53179cfe-9896-4c94-9f1d-01dd474e027e Status: Started Number of Bricks: 2 x 2 = 4 Transport-type: tcp Bricks: Brick1: xs141:/brick1/wtg001p0r0 Brick2: xs138:/brick1/wtg001p0r1 Brick3: xs139:/brick1/wtg001p1r0 Brick4: xs140:/brick1/wtg001p1r1 Options Reconfigured: nfs.disable: on performance.readdir-ahead: on [root@fs134 wtg001]# gluster volume info wtg002 Volume Name: wtg002 Type: Distributed-Replicate Volume ID: 410b67ad-bc1e-473b-b98f-ad431d7c9831 Status: Started Number of Bricks: 2 x 3 = 6 Transport-type: tcp Bricks: Brick1: xs141:/brick1/wtg001d2r0 Brick2: xs138:/brick1/wtg001d2r1 Brick3: xs139:/brick1/wtg001d2ra Brick4: xs139:/brick1/wtg001d3r0 Brick5: xs140:/brick1/wtg001d3r1 Brick6: xs141:/brick1/wtg001d3ra Options Reconfigured: nfs.disable: on performance.readdir-ahead: on [root@fs134 wtg001]# mount | grep wtg 0:/wtg001 on /home/wtg001 type fuse.glusterfs (rw,default_permissions,allow_other,max_read=131072) 0:/wtg002 on /home/wtg002 type fuse.glusterfs (rw,default_permissions,allow_other,max_read=131072) [root@fs134 wtg001]# |
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