Hi,
I am using a lustre 2.15.1 cluster with PFL. I'm using the following layout:
lfs setstripe -E 1M -L mdt -E 128M -c 1 -S 4M -E 2G -c 2 -z 64M -E -1 -c -1 -z
256M /lustre
OST's have zpools with zstd compression enabled.
This has worked fine for me for many years.
I now have new servers and installed 2.16.1 on them. I used the same PFL
layout, and after some benchmarking I proceeded to copy data from the old
lustre to the new.
After a while I noticed that it was filling up faster that expected, and say
that the compression ratio on the zpools was 1.
Compression on the zpools is enabled, it should have worked as far as I can
tell.
When I disable PFL, compression works as expected.
I have attached the some results in a txt file.
I have also tried 2.15.7 with the same results. Enabling PFL, or just DoM
disables compression on the OST's.
Am I missing something obvious here?
Regards,
Martin Balvers
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### No PFL
lfs setstripe -c 1 /mnt/lustre_new
## 1 file
# lfs getstripe test1.txt
test1.txt
lmm_stripe_count: 1
lmm_stripe_size: 4194304
lmm_pattern: raid0
lmm_layout_gen: 0
lmm_stripe_offset: 1
obdidx objid objid group
1 24 0x18 0x280000400
# ssh 192.168.6.2 zfs list -o
lustre:svname,compression,name,compressratio,refcompressratio,used,logicalused
lustre/ost && ssh 192.168.6.3 zfs list -o
lustre:svname,compression,name,compressratio,refcompressratio,used,logicalused
lustre/ost && ssh 192.168.6.4 zfs list -o
lustre:svname,compression,name,compressratio,refcompressratio,used,logicalused
lustre/ost
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0000 zstd lustre/ost 1.00x 1.00x 8.32M 4.15M
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0001 zstd lustre/ost 4.60x 4.60x 1.37G 6.29G
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0002 zstd lustre/ost 1.00x 1.00x 8.32M 4.15M
## 2 files
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0000 zstd lustre/ost 1.00x 1.00x 8.32M 4.15M
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0001 zstd lustre/ost 4.60x 4.60x 1.37G 6.29G
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0002 zstd lustre/ost 4.60x 4.60x 1.37G 6.29G
## 3 files
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0000 zstd lustre/ost 4.60x 4.60x 1.37G 6.29G
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0001 zstd lustre/ost 4.60x 4.60x 1.37G 6.29G
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0002 zstd lustre/ost 4.60x 4.60x 1.37G 6.29G
# du -h *
1.4G test1.txt
1.4G test2.txt
1.4G test3.txt
# ls -lh *
-rw-rw-r-- 1 lohrjl users 6.3G Jul 1 13:28 test1.txt
-rw-r--r-- 1 root root 6.3G Jul 23 09:34 test2.txt
-rw-r--r-- 1 root root 6.3G Jul 23 09:35 test3.txt
### PFL
lfs setstripe -E 1M -L mdt -E 128M -c 1 -S 4M -E 2G -c 2 -z 64M -E -1 -c -1 -z
256M /mnt/lustre_new
## 1 file
# lfs getstripe test1.txt
test1.txt
lcm_layout_gen: 55
lcm_mirror_count: 1
lcm_entry_count: 5
lcme_id: 1
lcme_mirror_id: 0
lcme_flags: init
lcme_extent.e_start: 0
lcme_extent.e_end: 1048576
lmm_stripe_count: 0
lmm_stripe_size: 1048576
lmm_pattern: mdt
lmm_layout_gen: 0
lmm_stripe_offset: 0
lcme_id: 2
lcme_mirror_id: 0
lcme_flags: init
lcme_extent.e_start: 1048576
lcme_extent.e_end: 134217728
lmm_stripe_count: 1
lmm_stripe_size: 4194304
lmm_pattern: raid0
lmm_layout_gen: 0
lmm_stripe_offset: 1
lmm_objects:
- 0: { l_ost_idx: 1, l_fid: [0x280000400:0x19:0x0] }
lcme_id: 3
lcme_mirror_id: 0
lcme_flags: init
lcme_extent.e_start: 134217728
lcme_extent.e_end: 2147483648
lmm_stripe_count: 2
lmm_stripe_size: 4194304
lmm_pattern: raid0
lmm_layout_gen: 0
lmm_stripe_offset: 2
lmm_objects:
- 0: { l_ost_idx: 2, l_fid: [0x2c0000400:0x18:0x0] }
- 1: { l_ost_idx: 0, l_fid: [0x240000400:0x1c:0x0] }
lcme_id: 5
lcme_mirror_id: 0
lcme_flags: init
lcme_extent.e_start: 2147483648
lcme_extent.e_end: 6979321856
lmm_stripe_count: 3
lmm_stripe_size: 4194304
lmm_pattern: raid0
lmm_layout_gen: 0
lmm_stripe_offset: 1
lmm_objects:
- 0: { l_ost_idx: 1, l_fid: [0x280000400:0x1a:0x0] }
- 1: { l_ost_idx: 2, l_fid: [0x2c0000400:0x19:0x0] }
- 2: { l_ost_idx: 0, l_fid: [0x240000400:0x1d:0x0] }
lcme_id: 6
lcme_mirror_id: 0
lcme_flags: extension
lcme_extent.e_start: 6979321856
lcme_extent.e_end: EOF
lmm_stripe_count: 0
lmm_extension_size: 268435456
lmm_pattern: raid0
lmm_layout_gen: 0
lmm_stripe_offset: -1
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0000 zstd lustre/ost 1.00x 1.00x 2.43G 2.40G
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0001 zstd lustre/ost 1.00x 1.00x 1.59G 1.57G
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0002 zstd lustre/ost 1.00x 1.00x 2.42G 2.39G
# du -h *
6.5G test1.txt
# ls -lh *
-rw-rw-r-- 1 lohrjl users 6.3G Jul 1 13:28 test1.txt
## 3 files
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0000 zstd lustre/ost 1.00x 1.00x 7.26G 7.18G
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0001 zstd lustre/ost 1.00x 1.00x 5.59G 5.53G
LUSTRE:SVNAME COMPRESS NAME RATIO REFRATIO USED LUSED
lustre-OST0002 zstd lustre/ost 1.00x 1.00x 6.43G 6.35G
# du -h *
6.5G test1.txt
6.5G test2.txt
6.5G test3.txt
# ls -lh *
-rw-rw-r-- 1 lohrjl users 6.3G Jul 1 13:28 test1.txt
-rw-r--r-- 1 root root 6.3G Jul 23 09:34 test2.txt
-rw-r--r-- 1 root root 6.3G Jul 23 09:35 test3.txt
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