Bug 1540376
| Summary: | Tiered volume performance degrades badly after a volume stop/start or system restart. | ||
|---|---|---|---|
| Product: | [Community] GlusterFS | Reporter: | Jeff Byers <jbyers> |
| Component: | tiering | Assignee: | bugs <bugs> |
| Status: | CLOSED WONTFIX | QA Contact: | bugs <bugs> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | mainline | CC: | bugs, jbyers, vnosov |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-11-02 08:13:43 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
This problem appears to be related to the sqlite3 DB files that are used for the tiering file access counters, stored on each hot and cold tier brick in .glusterfs/<volname>.db. When the tier is first created, these DB files do not exist, they are created, and everything works fine. On a stop/start or service restart, the .db files are already present, albeit empty since I don't have cluster.write-freq- threshold nor cluster.read-freq-threshold set, so features.record-counters is off and nothing should be going into the DB. I've found that if I delete these .db files after the volume stop, but before the volume start, the tiering performance is normal, not degraded. Of course all of the history in these DB files is lost. Not sure what other ramifications there are to deleting these .db files. When I did have one of the freq-threshold settings set, I did see a record get added to the file, so the sqlite3 DB is working to some degree. The sqlite3 version I have installed is sqlite-3.6.20- 1.el6_7.2.x86_64. The problem was simple, the sqlite3 DB connection parameters
were only being set on a newly created DB, not when there was
an existing DB. Apparently the sqlite3 DB default parameters
are not ideal.
diff -up glusterfs-3.7.18/libglusterfs/src/gfdb/gfdb_sqlite3.c-orig glusterfs-3.7.18/libglusterfs/src/gfdb/gfdb_sqlite3.c
--- glusterfs-3.7.18/libglusterfs/src/gfdb/gfdb_sqlite3.c-orig 2018-02-01 13:14:19.000000000 -0800
+++ glusterfs-3.7.18/libglusterfs/src/gfdb/gfdb_sqlite3.c 2018-02-01 13:31:24.000000000 -0800
@@ -449,9 +449,11 @@ gf_sqlite3_init (dict_t *args, void **db
- /* If the file exist we skip the config part
- * and creation of the schema */
- if (is_dbfile_exist)
- goto db_exists;
-
/*Apply sqlite3 params to database*/
ret = apply_sql_params_db (sql_conn, args);
@@ -462,6 +464,12 @@ gf_sqlite3_init (dict_t *args, void **db
goto out;
}
+ /* If the file exist we skip the config part
+ * and creation of the schema */
+ if (is_dbfile_exist)
+ goto db_exists;
+
/*Create the schema if NOT present*/
ret = create_filetable (sql_conn->sqlite3_db_conn);
if (ret) {
Release 3.12 has been EOLd and this bug was still found to be in the NEW state, hence moving the version to mainline, to triage the same and take appropriate actions. Patch https://review.gluster.org/#/c/glusterfs/+/21331/ removes tier functionality from GlusterFS. https://bugzilla.redhat.com/show_bug.cgi?id=1642807 is used as the tracking bug for this. Recommendation is to convert your tier volume to regular volume (either replicate, ec, or plain distribute) with "tier detach" command before upgrade, and use backend features like dm-cache etc to utilize the caching from backend to provide better performance and functionality. |
Tiered volume performance degrades badly after a volume stop/start or system restart. The degradation is very significant, making the performance of an SSD hot tiered volume a fraction of what it was with the HDD before tiering. Stopping and starting the tiered volume causes the problem to exhibit. Stopping and starting the Gluster services also does. Nothing in the tier is being promoted or demoted, the volume starts empty, a file is written, then read, then deleted. The file(s) only ever exist on the hot tier. This affects GlusterFS FUSE mounts, and also NFSv3 NFS mounts. The problem has been reproduced in two test lab environments. The issue was first seen using GlusterFS 3.7.18, and retested with the same result using GlusterFS 3.12.3. I'm using the default tiering settings, no adjustments. Nothing of any significance appears to be being reported in the GlusterFS logs. Summary: Before SSD tiering, HDD performance on a FUSE mount was 130.87 MB/sec writes, 128.53 MB/sec reads. After SSD tiering, performance on a FUSE mount was 199.99 MB/sec writes, 257.28 MB/sec reads. After GlusterFS volume stop/start, SSD tiering performance on FUSE mount was 35.81 MB/sec writes, 37.33 MB/sec reads. A very significant reduction in performance. Detaching and reattaching the SSD tier restores the good tiered performance. Details below: ##################################### ### Create the volume and mounts. ##################################### # gluster volume create volume-1 transport tcp 192.168.101.226:/exports/brick-hdd/volume-1 volume create: volume-1: success: please start the volume to access data # gluster volume set volume-1 allow-insecure on volume set: success # gluster volume set volume-1 allow-insecure on volume set: success # gluster volume set volume-1 nfs.disable off Gluster NFS is being deprecated in favor of NFS-Ganesha Enter "yes" to continue using Gluster NFS (y/n) y volume set: success # gluster volume start volume-1 volume start: volume-1: success # gluster volume info Volume Name: volume-1 Type: Distribute Volume ID: 24e958c7-b39f-441b-90eb-2120260ee8d1 Status: Started Snapshot Count: 0 Number of Bricks: 1 Transport-type: tcp Bricks: Brick1: 192.168.101.226:/exports/brick-hdd/volume-1 Options Reconfigured: server.allow-insecure: on transport.address-family: inet nfs.disable: off # glusterfs --acl --volfile-server=127.0.0.1 --volfile-id=/volume-1 /samba/volume-1 # mount -o "soft,vers=3,tcp" 192.168.101.226:/volume-1 /mnt/volume-1 ##################################### ### FUSE Mount read and write performance with HDD without tiering. ##################################### # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/samba/volume-1/testfile.dat count=16384 time to transfer data was 16.409684 secs, 130.87 MB/sec # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/samba/volume-1/testfile.dat count=16384 time to transfer data was 16.707668 secs, 128.53 MB/sec # gluster volume profile volume-1 info Brick: 192.168.101.226:/exports/brick-hdd/volume-1 -------------------------------------------------- Cumulative Stats: Block Size: 4096b+ 8192b+ 16384b+ No. of Reads: 0 0 0 No. of Writes: 3 2 4 Block Size: 32768b+ 65536b+ 131072b+ No. of Reads: 0 0 16384 No. of Writes: 16 16 49161 Block Size: 262144b+ 524288b+ 1048576b+ No. of Reads: 0 2 2047 No. of Writes: 11 25 2018 %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.00 0.00 us 0.00 us 0.00 us 2 FORGET 0.00 0.00 us 0.00 us 0.00 us 4 RELEASE 0.00 23.00 us 23.00 us 23.00 us 1 STATFS 0.00 15.00 us 14.00 us 16.00 us 2 FLUSH 0.00 17.00 us 12.00 us 22.00 us 2 STAT 0.00 51.00 us 15.00 us 87.00 us 2 ACCESS 0.00 165.00 us 165.00 us 165.00 us 1 CREATE 0.00 399.00 us 399.00 us 399.00 us 1 OPEN 0.00 53.72 us 28.00 us 174.00 us 18 LOOKUP 0.06 154611.00 us 154611.00 us 154611.00 us 1 UNLINK 99.94 8174.57 us 56.00 us 227368.00 us 32766 WRITE Duration: 377 seconds Data Read: 4294967296 bytes Data Written: 8589934592 bytes ##################################### ## NFS Mount read and write performance with HDD without tiering. ##################################### # rm -f /samba/volume-1/testfile.dat /mnt/volume-1/testfile.dat # sync;sync; echo 3 > /proc/sys/vm/drop_caches # gluster volume profile volume-1 start clear Starting volume profile on volume-1 has been successful # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/mnt/volume-1/testfile.dat count=16384 time to transfer data was 41.936227 secs, 51.21 MB/sec # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/mnt/volume-1/testfile.dat of=/dev/null count=16384 time to transfer data was 30.138106 secs, 71.25 MB/sec # gluster volume profile volume-1 info Brick: 192.168.101.226:/exports/brick-hdd/volume-1 -------------------------------------------------- Cumulative Stats: Block Size: 4096b+ 8192b+ 16384b+ No. of Reads: 0 0 0 No. of Writes: 9 10 56 Block Size: 32768b+ 65536b+ 131072b+ No. of Reads: 0 0 16384 No. of Writes: 180 35 49190 Block Size: 262144b+ 524288b+ 1048576b+ No. of Reads: 0 4 4094 No. of Writes: 20 62 4016 %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.00 0.00 us 0.00 us 0.00 us 3 FORGET 0.00 0.00 us 0.00 us 0.00 us 5 RELEASE 0.00 24.00 us 23.00 us 25.00 us 2 STATFS 0.00 51.00 us 51.00 us 51.00 us 1 GETXATTR 0.00 33.60 us 15.00 us 87.00 us 5 ACCESS 0.00 35.17 us 12.00 us 82.00 us 6 STAT 0.00 168.00 us 165.00 us 171.00 us 2 CREATE 0.00 399.00 us 399.00 us 399.00 us 1 OPEN 0.00 57.31 us 23.00 us 183.00 us 26 LOOKUP 0.02 2799.59 us 14.00 us 236711.00 us 108 FLUSH 0.03 202899.00 us 154611.00 us 251187.00 us 2 UNLINK 31.06 190240.58 us 8753.00 us 632660.00 us 2049 READ 68.89 24641.36 us 35.00 us 20466767.00 us 35088 WRITE Duration: 674 seconds Data Read: 6442450944 bytes Data Written: 10737418240 bytes ##################################### ## Attach the hot tier SSD disk. ##################################### # gluster volume tier volume-1 attach 192.168.101.226:/exports/brick-ssd/volume-1 volume attach-tier: success # gluster volume info Volume Name: volume-1 Type: Tier Volume ID: 24e958c7-b39f-441b-90eb-2120260ee8d1 Status: Started Snapshot Count: 0 Number of Bricks: 2 Transport-type: tcp Hot Tier : Hot Tier Type : Distribute Number of Bricks: 1 Brick1: 192.168.101.226:/exports/brick-ssd/volume-1 Cold Tier: Cold Tier Type : Distribute Number of Bricks: 1 Brick2: 192.168.101.226:/exports/brick-hdd/volume-1 Options Reconfigured: cluster.tier-mode: cache features.ctr-enabled: on server.allow-insecure: on transport.address-family: inet nfs.disable: off ##################################### ### FUSE Mount read and write performance with HDD with SSD tiering. ##################################### # rm -f /samba/volume-1/testfile.dat /mnt/volume-1/testfile.dat # sync;sync; echo 3 > /proc/sys/vm/drop_caches # gluster volume profile volume-1 start clear Starting volume profile on volume-1 has been successful # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/samba/volume-1/testfile.dat count=16384 time to transfer data was 10.737773 secs, 199.99 MB/sec # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/samba/volume-1/testfile.dat of=/dev/null count=16384 time to transfer data was 8.346831 secs, 257.28 MB/sec # gluster volume profile volume-1 info Brick: 192.168.101.226:/exports/brick-ssd/volume-1 -------------------------------------------------- Cumulative Stats: Block Size: 131072b+ No. of Reads: 16384 No. of Writes: 16384 %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.00 0.00 us 0.00 us 0.00 us 1 RELEASE 0.00 0.00 us 0.00 us 0.00 us 1 RELEASEDIR 0.00 18.00 us 18.00 us 18.00 us 1 FLUSH 0.00 44.82 us 30.00 us 90.00 us 11 LOOKUP 0.00 763.00 us 763.00 us 763.00 us 1 CREATE 0.46 29.09 us 23.00 us 366.00 us 16361 STAT 1.34 4664.81 us 14.00 us 123500.00 us 294 STATFS 11.71 732.17 us 234.00 us 2151.00 us 16384 READ 86.49 5410.15 us 146.00 us 245867.00 us 16384 WRITE Duration: 158 seconds Data Read: 2147483648 bytes Data Written: 2147483648 bytes Brick: 192.168.101.226:/exports/brick-hdd/volume-1 -------------------------------------------------- Cumulative Stats: Block Size: 4096b+ 8192b+ 16384b+ No. of Reads: 0 0 0 No. of Writes: 9 10 56 Block Size: 32768b+ 65536b+ 131072b+ No. of Reads: 0 0 16384 No. of Writes: 180 35 49190 Block Size: 262144b+ 524288b+ 1048576b+ No. of Reads: 0 4 4094 No. of Writes: 20 62 4016 %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.00 0.00 us 0.00 us 0.00 us 4 FORGET 0.00 0.00 us 0.00 us 0.00 us 5 RELEASE 0.00 0.00 us 0.00 us 0.00 us 1 RELEASEDIR 0.00 51.00 us 51.00 us 51.00 us 1 GETXATTR 0.00 24.00 us 22.00 us 26.00 us 4 STATFS 0.00 33.60 us 15.00 us 87.00 us 5 ACCESS 0.00 35.17 us 12.00 us 82.00 us 6 STAT 0.00 168.00 us 165.00 us 171.00 us 2 CREATE 0.00 399.00 us 399.00 us 399.00 us 1 OPEN 0.00 1044.00 us 1044.00 us 1044.00 us 1 SETATTR 0.00 53.62 us 23.00 us 183.00 us 47 LOOKUP 0.00 3380.00 us 3380.00 us 3380.00 us 1 MKNOD 0.00 4686.00 us 39.00 us 9333.00 us 2 IPC 0.02 2799.59 us 14.00 us 236711.00 us 108 FLUSH 0.03 202899.00 us 154611.00 us 251187.00 us 2 UNLINK 31.06 190240.58 us 8753.00 us 632660.00 us 2049 READ 68.89 24641.36 us 35.00 us 20466767.00 us 35088 WRITE Duration: 977 seconds Data Read: 6442450944 bytes Data Written: 10737418240 bytes ##################################### ### NFS Mount read and write performance with HDD with SSD tiering. ##################################### # rm -f /samba/volume-1/testfile.dat /mnt/volume-1/testfile.dat # sync;sync; echo 3 > /proc/sys/vm/drop_caches # gluster volume profile volume-1 start clear Starting volume profile on volume-1 has been successful # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/mnt/volume-1/testfile.dat count=16384 time to transfer data was 33.214713 secs, 64.65 MB/sec # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/mnt/volume-1/testfile.dat of=/dev/null count=16384 time to transfer data was 7.944743 secs, 270.30 MB/sec # gluster volume profile volume-1 info Brick: 192.168.101.226:/exports/brick-ssd/volume-1 -------------------------------------------------- Cumulative Stats: Block Size: 4096b+ 8192b+ 16384b+ No. of Reads: 0 0 0 No. of Writes: 9 5 14 Block Size: 32768b+ 65536b+ 131072b+ No. of Reads: 0 0 16384 No. of Writes: 22 147 16643 Block Size: 262144b+ 524288b+ 1048576b+ No. of Reads: 0 2 2047 No. of Writes: 15 46 1954 %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.00 0.00 us 0.00 us 0.00 us 1 FORGET 0.00 0.00 us 0.00 us 0.00 us 2 RELEASE 0.00 0.00 us 0.00 us 0.00 us 1 RELEASEDIR 0.00 28.00 us 28.00 us 28.00 us 1 ACCESS 0.00 75.00 us 75.00 us 75.00 us 1 GETXATTR 0.00 50.14 us 30.00 us 110.00 us 14 LOOKUP 0.00 731.50 us 700.00 us 763.00 us 2 CREATE 0.00 142.94 us 13.00 us 2008.00 us 104 FLUSH 0.08 29.09 us 22.00 us 366.00 us 16364 STAT 14.47 93985.20 us 14.00 us 20325659.00 us 900 STATFS 24.67 7827.09 us 234.00 us 81162.00 us 18433 READ 60.78 18847.35 us 129.00 us 20634527.00 us 18855 WRITE Duration: 361 seconds Data Read: 4294967296 bytes Data Written: 4294967296 bytes Brick: 192.168.101.226:/exports/brick-hdd/volume-1 -------------------------------------------------- Cumulative Stats: Block Size: 4096b+ 8192b+ 16384b+ No. of Reads: 0 0 0 No. of Writes: 9 10 56 Block Size: 32768b+ 65536b+ 131072b+ No. of Reads: 0 0 16384 No. of Writes: 180 35 49190 Block Size: 262144b+ 524288b+ 1048576b+ No. of Reads: 0 4 4094 No. of Writes: 20 62 4016 %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.00 0.00 us 0.00 us 0.00 us 4 FORGET 0.00 0.00 us 0.00 us 0.00 us 5 RELEASE 0.00 0.00 us 0.00 us 0.00 us 1 RELEASEDIR 0.00 48.50 us 46.00 us 51.00 us 2 GETXATTR 0.00 22.00 us 14.00 us 26.00 us 6 STATFS 0.00 32.14 us 12.00 us 82.00 us 7 STAT 0.00 41.83 us 15.00 us 87.00 us 6 ACCESS 0.00 168.00 us 165.00 us 171.00 us 2 CREATE 0.00 399.00 us 399.00 us 399.00 us 1 OPEN 0.00 544.50 us 45.00 us 1044.00 us 2 SETATTR 0.00 53.53 us 23.00 us 183.00 us 51 LOOKUP 0.00 1765.00 us 150.00 us 3380.00 us 2 MKNOD 0.00 4766.50 us 38.00 us 9656.00 us 4 IPC 0.02 2799.59 us 14.00 us 236711.00 us 108 FLUSH 0.03 202899.00 us 154611.00 us 251187.00 us 2 UNLINK 31.06 190240.58 us 8753.00 us 632660.00 us 2049 READ 68.89 24641.36 us 35.00 us 20466767.00 us 35088 WRITE Duration: 1180 seconds Data Read: 6442450944 bytes Data Written: 10737418240 bytes ##################################### ### Stop and start the GlusterFS volume. ##################################### # gluster volume stop volume-1 Stopping volume will make its data inaccessible. Do you want to continue? (y/n) y volume stop: volume-1: success # gluster volume start volume-1 volume start: volume-1: success # umount /samba/volume-1/ # umount /mnt/volume-1/ # mount -t glusterfs -o acl 127.0.0.1:/volume-1 /samba/volume-1/ # mount -o "soft,vers=3,tcp" 192.168.101.226:/volume-1 /mnt/volume-1 ##################################### ### FUSE Mount read and write performance with HDD with SSD tiering after volume stop/start. ##################################### # rm -f /samba/volume-1/testfile.dat /mnt/volume-1/testfile.dat # sync;sync; echo 3 > /proc/sys/vm/drop_caches # gluster volume profile volume-1 start clear Starting volume profile on volume-1 has been successful # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/samba/volume-1/testfile.dat count=16384 time to transfer data was 59.973165 secs, 35.81 MB/sec # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/samba/volume-1/testfile.dat of=/dev/null count=16384 time to transfer data was 57.523719 secs, 37.33 MB/sec # gluster volume profile volume-1 info Brick: 192.168.101.226:/exports/brick-hdd/volume-1 -------------------------------------------------- Cumulative Stats: %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.56 34.00 us 19.00 us 49.00 us 2 STATFS 0.71 85.00 us 85.00 us 85.00 us 1 SETATTR 6.31 36.19 us 24.00 us 131.00 us 21 LOOKUP 17.56 2116.00 us 2116.00 us 2116.00 us 1 MKNOD 74.87 2256.00 us 32.00 us 6098.00 us 4 IPC Duration: 326 seconds Data Read: 0 bytes Data Written: 0 bytes Brick: 192.168.101.226:/exports/brick-ssd/volume-1 -------------------------------------------------- Cumulative Stats: Block Size: 131072b+ No. of Reads: 16384 No. of Writes: 16384 %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.00 0.00 us 0.00 us 0.00 us 1 RELEASE 0.00 237.00 us 237.00 us 237.00 us 1 FLUSH 0.00 44.55 us 28.00 us 92.00 us 11 LOOKUP 0.00 7954.00 us 7954.00 us 7954.00 us 1 CREATE 0.10 40.04 us 22.00 us 386.00 us 16382 STAT 0.60 5850.17 us 11.00 us 195272.00 us 662 STATFS 16.67 6587.80 us 3201.00 us 16650.00 us 16384 READ 82.63 32659.94 us 3559.00 us 366309.00 us 16384 WRITE Duration: 327 seconds Data Read: 2147483648 bytes Data Written: 2147483648 bytes ##################################### ### NFS Mount read and write performance with HDD with SSD tiering after volume stop/start. ##################################### # rm -f /samba/volume-1/testfile.dat /mnt/volume-1/testfile.dat # sync;sync; echo 3 > /proc/sys/vm/drop_caches # gluster volume profile volume-1 start clear Starting volume profile on volume-1 has been successful # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/mnt/volume-1/testfile.dat count=16384 time to transfer data was 59.720392 secs, 35.96 MB/sec # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/mnt/volume-1/testfile.dat of=/dev/null count=16384 time to transfer data was 33.495813 secs, 64.11 MB/sec # gluster volume profile volume-1 info Brick: 192.168.101.226:/exports/brick-hdd/volume-1 -------------------------------------------------- Cumulative Stats: %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.09 21.00 us 21.00 us 21.00 us 1 STAT 0.20 47.00 us 47.00 us 47.00 us 1 GETXATTR 0.27 32.50 us 31.00 us 34.00 us 2 ACCESS 0.87 105.00 us 85.00 us 125.00 us 2 SETATTR 0.94 56.50 us 19.00 us 95.00 us 4 STATFS 3.90 37.56 us 24.00 us 131.00 us 25 LOOKUP 9.43 1135.00 us 154.00 us 2116.00 us 2 MKNOD 84.31 2537.38 us 32.00 us 7024.00 us 8 IPC Duration: 543 seconds Data Read: 0 bytes Data Written: 0 bytes Brick: 192.168.101.226:/exports/brick-ssd/volume-1 -------------------------------------------------- Cumulative Stats: Block Size: 4096b+ 8192b+ 16384b+ No. of Reads: 0 0 0 No. of Writes: 21 4 67 Block Size: 32768b+ 65536b+ 131072b+ No. of Reads: 0 0 16384 No. of Writes: 214 296 16840 Block Size: 262144b+ 524288b+ 1048576b+ No. of Reads: 0 2 2047 No. of Writes: 94 99 1834 %-latency Avg-latency Min-Latency Max-Latency No. of calls Fop --------- ----------- ----------- ----------- ------------ ---- 0.00 0.00 us 0.00 us 0.00 us 1 FORGET 0.00 0.00 us 0.00 us 0.00 us 2 RELEASE 0.00 31.00 us 31.00 us 31.00 us 1 ACCESS 0.00 61.00 us 61.00 us 61.00 us 1 GETXATTR 0.00 50.14 us 28.00 us 98.00 us 14 LOOKUP 0.00 7588.00 us 7222.00 us 7954.00 us 2 CREATE 0.01 2799.44 us 16.00 us 44718.00 us 87 FLUSH 0.03 40.04 us 22.00 us 386.00 us 16385 STAT 2.21 29997.91 us 11.00 us 4715716.00 us 1428 STATFS 28.28 29731.49 us 3201.00 us 697284.00 us 18433 READ 69.47 69158.05 us 2748.00 us 20388039.00 us 19469 WRITE Duration: 544 seconds Data Read: 4294967296 bytes Data Written: 4294967296 bytes ##################################### ### Detach tier, performance goes back to HDD normal. ##################################### # rm -f /samba/volume-1/testfile.dat /mnt/volume-1/testfile.dat # gluster volume tier volume-1 detach start volume detach tier start: success ID: 224f1b4b-376a-4623-b901-5e429866fbd2 # gluster volume tier volume-1 detach status volume detach tier status: success Node Rebalanced-files size scanned failures skipped status run time in h:m:s --------- ----------- ----------- ----------- ----------- ----------- ------------ -------------- localhost 1 2.0GB 2 0 0 completed 0:00:18 # gluster volume tier volume-1 detach commit Removing tier can result in data loss. Do you want to Continue? (y/n) y volume detach tier commit: success ##################################### ### Detached tier, performance goes back to HDD normal. ##################################### # rm -f /samba/volume-1/testfile.dat /mnt/volume-1/testfile.dat # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/samba/volume-1/testfile.dat count=16384 time to transfer data was 16.588293 secs, 129.46 MB/sec # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/samba/volume-1/testfile.dat of=/dev/null count=16384 time to transfer data was 16.504866 secs, 130.11 MB/sec ##################################### ### Reattach tier, performance goes back to SSD tiered normal. ##################################### # gluster volume tier volume-1 attach 192.168.101.226:/exports/brick-ssd/volume-1 volume attach-tier: success ##################################### ### Reattached tier, performance goes back to SSD tiered normal. ##################################### # rm -f /samba/volume-1/testfile.dat /mnt/volume-1/testfile.dat # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/dev/zero of=/samba/volume-1/testfile.dat count=16384 time to transfer data was 10.512222 secs, 204.28 MB/sec # sync;sync; echo 3 > /proc/sys/vm/drop_caches # sgp_dd time=1 thr=1 bs=128K bpt=1 if=/samba/volume-1/testfile.dat of=/dev/null count=16384 time to transfer data was 8.374527 secs, 256.43 MB/sec