I have two identical Dell PowerEdge R610 servers: Disks: 6 x Samsung SSD 840 Pro 512GB Controller: LSI-9207-8i, same firmware OS: SLES 12 SP2, kernel 4.4.59-92.24 DRBD: 9.0.6+git.08cda19-57.1.x86_64 Backing Device: mdraid 5, /dev/md2 Config file: /sys/module/raid456/parameters/devices_handle_discard_safely=Y Config file: /etc/lvm/lvm.conf contains: issue_discards = 0 Config file: /etc/crypttab is not used
However, one server shows DRBD supporting TRIM... NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO sda 0 512B 4G 1 ├─sda1 0 512B 4G 1 │ └─md0 0 128K 256M 0 ├─sda2 0 512B 4G 1 │ └─md1 0 128K 256M 0 ├─sda3 0 512B 4G 1 ├─sda4 0 512B 4G 1 ├─sda5 0 512B 4G 1 │ └─md2 0 128K 256M 0 │ └─drbd0 0 128K 128M 0 <snip> ...but the other does not, even though the underlying devices do (note the 0 values for DISC-GRAN and DISC-MAX for drbd)... NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO sda 0 512B 4G 1 ├─sda1 0 512B 4G 1 │ └─md0 0 128K 256M 0 ├─sda2 0 512B 4G 1 │ └─md1 0 128K 256M 0 ├─sda3 0 512B 4G 1 ├─sda4 0 512B 4G 1 ├─sda5 0 512B 4G 1 │ └─md2 0 128K 256M 0 │ └─drbd0 0 0B 0B 0 <snip> What am I missing? -- Eric Robinson
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