[ceph-users] Journal / WAL drive size?

Rudi Ahlers rudiahlers at gmail.com
Thu Nov 23 01:27:36 PST 2017


Hi,

Can someone please explain this to me in layman's terms. How big a WAL
drive do I really need?

I have a 2x 400GB SSD drives used as WAL / DB drive and 4x 8TB HDD's used
as OSD's. When I look at the drive partitions the DB / WAL partitions are
only 576Mb & 1GB respectively. This feels a bit small.


root at virt1:~# lsblk
NAME               MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                  8:0    0   7.3T  0 disk
├─sda1               8:1    0   100M  0 part /var/lib/ceph/osd/ceph-0
└─sda2               8:2    0   7.3T  0 part
sdb                  8:16   0   7.3T  0 disk
├─sdb1               8:17   0   100M  0 part /var/lib/ceph/osd/ceph-1
└─sdb2               8:18   0   7.3T  0 part
sdc                  8:32   0   7.3T  0 disk
├─sdc1               8:33   0   100M  0 part /var/lib/ceph/osd/ceph-2
└─sdc2               8:34   0   7.3T  0 part
sdd                  8:48   0   7.3T  0 disk
├─sdd1               8:49   0   100M  0 part /var/lib/ceph/osd/ceph-3
└─sdd2               8:50   0   7.3T  0 part
sde                  8:64   0 372.6G  0 disk
├─sde1               8:65   0     1G  0 part
├─sde2               8:66   0   576M  0 part
├─sde3               8:67   0     1G  0 part
└─sde4               8:68   0   576M  0 part
sdf                  8:80   0 372.6G  0 disk
├─sdf1               8:81   0     1G  0 part
├─sdf2               8:82   0   576M  0 part
├─sdf3               8:83   0     1G  0 part
└─sdf4               8:84   0   576M  0 part
sdg                  8:96   0   118G  0 disk
├─sdg1               8:97   0     1M  0 part
├─sdg2               8:98   0   256M  0 part /boot/efi
└─sdg3               8:99   0 117.8G  0 part
  ├─pve-swap       253:0    0     8G  0 lvm  [SWAP]
  ├─pve-root       253:1    0  29.3G  0 lvm  /
  ├─pve-data_tmeta 253:2    0    68M  0 lvm
  │ └─pve-data     253:4    0  65.9G  0 lvm
  └─pve-data_tdata 253:3    0  65.9G  0 lvm
    └─pve-data     253:4    0  65.9G  0 lvm




-- 
Kind Regards
Rudi Ahlers
Website: http://www.rudiahlers.co.za
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