[LU-12768] readcache_max_filesize in 2.12?

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.12.2
• Fix Version/s: Lustre 2.14.0
• Type: Bug
• Priority: Minor
• Reporter: Stephane Thiell
• Assignee: Patrick Farrell (Inactive)
• Resolution: Done

Environment

2.12.2_116+3 patches, CentOS 7.6

• Severity: 3

Description

Hello,

We're playing with readcache_max_filesize to adjust OSS caching per object size, but while it seems to work on Oak (2.10.8), we can't find the tunable with 2.12. Did we miss something obvious? Thanks!

[root@fir-io1-s1 ~]# lctl get_param obdfilter.*.readcache_max_filesize
error: get_param: param_path 'obdfilter/*/readcache_max_filesize': No such file or directory
[root@fir-io1-s1 ~]# ls /sys/fs/lustre/obdfilter/fir-OST0000/
blocksize               client_cache_count    degraded   filestotal  grant_precreate  kbytesfree   lfsck_speed_limit  seqs_allocated   sync_journal      tgt_fmd_count    uuid
checksum_t10pi_enforce  client_cache_seconds  filesfree  fstype      kbytesavail      kbytestotal  precreate_batch    soft_sync_limit  sync_lock_cancel  tgt_fmd_seconds
[root@fir-io1-s1 ~]# cat /sys/fs/lustre/version 
2.12.2_119_g2d4809a

https://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.xhtml#idm140482875762544
 
Thanks!
Stephane
 

Issue Links

• is related to: LUDOC-457 readcache max file size moved in 2.12...

Comments

[Patrick Farrell (Inactive)]

Stephane,

It's been moved:

lctl list_param *.*OST0000*.*readcache*
osd-ldiskfs.lustre-OST0000.readcache_max_filesize 

 

[Stephane Thiell]

Thanks Patrick! It works!

 

[root@fir-io1-s1 ~]# lctl get_param osd-ldiskfs.fir-OST0000.readcache_max_filesize 
osd-ldiskfs.fir-OST0000.readcache_max_filesize=18446744073709551615
[root@fir-io1-s1 ~]# lctl set_param osd-ldiskfs.fir-OST0000.readcache_max_filesize=32M
osd-ldiskfs.fir-OST0000.readcache_max_filesize=32M
[root@fir-io1-s1 ~]# lctl get_param osd-ldiskfs.fir-OST0000.readcache_max_filesize 
osd-ldiskfs.fir-OST0000.readcache_max_filesize=33554432

So it is ldiskfs-specific? just curious, is this option available with ZFS backend?

[Patrick Farrell (Inactive)]

It's available on ZFS as well, yeah.  (In general, ZFS caching isn't quite as controllable as the ldiskfs sort, so not all the options are there...  But this is.)

[Stephane Thiell]

Thanks again Patrick, that sounds good! I would recommend to update the Lustre manual or at least add a note that it has moved to the osd backend in 2.12 to avoid any confusion.

[Patrick Farrell (Inactive)]

Opened LUDOC-457 to track updating the manual.

[Gerrit Updater]

Neil Brown ([e-mail]) uploaded a new patch: https://review.whamcloud.com/39124
Subject: LU-12768 o2iblnd: wait properly for fps>increasing.-
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: d17be980c1f249e2c7c1787c79fbce1e64b44187

Should be LU-12678.

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/39124/
Subject: LU-12768 o2iblnd: wait properly for fps>increasing.-
Project: fs/lustre-release
Branch: master
-Current Patch Set: -
Commit: 530eca31556f7708781bcd1b1809ae286aee4c57

Should be LU-12678.