Hi,today we migrated all of our rocksdb and wal devices to new once. The new once are much bigger (500MB for wal/db -> 60GB db and 2G WAL) and LVM based.
We migrated like:
export OSD=x
systemctl stop ceph-osd@$OSD
lvcreate -n db-osd$OSD -L60g data || exit 1
lvcreate -n wal-osd$OSD -L2g data || exit 1
dd if=/var/lib/ceph/osd/ceph-$OSD/block.wal
of=/dev/data/wal-osd$OSD bs=1M || exit 1
dd if=/var/lib/ceph/osd/ceph-$OSD/block.db of=/dev/data/db-osd$OSD
bs=1M || exit 1
rm -v /var/lib/ceph/osd/ceph-$OSD/block.db || exit 1
rm -v /var/lib/ceph/osd/ceph-$OSD/block.wal || exit 1
ln -vs /dev/data/db-osd$OSD /var/lib/ceph/osd/ceph-$OSD/block.db ||
exit 1
ln -vs /dev/data/wal-osd$OSD /var/lib/ceph/osd/ceph-$OSD/block.wal
|| exit 1
chown -c ceph:ceph $(realpath /dev/data/db-osd$OSD) || exit 1
chown -c ceph:ceph $(realpath /dev/data/wal-osd$OSD) || exit 1
chown -ch ceph:ceph /var/lib/ceph/osd/ceph-$OSD/block.db || exit 1
chown -ch ceph:ceph /var/lib/ceph/osd/ceph-$OSD/block.wal || exit 1
ceph-bluestore-tool bluefs-bdev-expand --path
/var/lib/ceph/osd/ceph-$OSD/ || exit 1
systemctl start ceph-osd@$OSD
Everything went fine but it looks like the db and wal size is still the
old one:
ceph daemon osd.0 perf dump|jq '.bluefs'
{
"gift_bytes": 0,
"reclaim_bytes": 0,
"db_total_bytes": 524279808,
"db_used_bytes": 330301440,
"wal_total_bytes": 524283904,
"wal_used_bytes": 69206016,
"slow_total_bytes": 320058949632,
"slow_used_bytes": 13606322176,
"num_files": 220,
"log_bytes": 44204032,
"log_compactions": 0,
"logged_bytes": 31145984,
"files_written_wal": 1,
"files_written_sst": 1,
"bytes_written_wal": 37753489,
"bytes_written_sst": 238992
}
Even if the new block devices are recognized correctly:
2018-11-20 11:40:34.653524 7f70219b8d00 1 bdev(0x5647ea9ce200
/var/lib/ceph/osd/ceph-0/block.db) open size 64424509440 (0xf00000000,
60GiB) block_size 4096 (4KiB) non-rotational
2018-11-20 11:40:34.653532 7f70219b8d00 1 bluefs add_block_device bdev
1 path /var/lib/ceph/osd/ceph-0/block.db size 60GiB
2018-11-20 11:40:34.662385 7f70219b8d00 1 bdev(0x5647ea9ce600 /var/lib/ceph/osd/ceph-0/block.wal) open size 2147483648 (0x80000000, 2GiB) block_size 4096 (4KiB) non-rotational 2018-11-20 11:40:34.662406 7f70219b8d00 1 bluefs add_block_device bdev 0 path /var/lib/ceph/osd/ceph-0/block.wal size 2GiB
Are we missing some command to "notify" rocksdb about the new device size? All the best, Florian
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