[LU-2814] discover the server version from the client

• Status: Resolved
• Project: Lustre
• Fix Version/s: Lustre 2.6.0
• Type: Bug
• Priority: Minor
• Reporter: Richard Henwood (Inactive)
• Assignee: WC Triage
• Resolution: Fixed
• Labels: hackathon2017
• Severity: 3

Description

You can discover the client software version using:

# lctl get_param version
lustre: 2.3.61
kernel: patchless_client
build:  v2_3_61_0-g997d2b5-CHANGED-2.6.32

However, the version of the server software is not readily available to a user without access to the servers. The client knowns what version of the servers it is connected to.

It would be good to expose the server version on the client. A starting point for this information would be struct obd_connect_data:ocd_version

Issue Links

• is related to: LU-3386 improve osc/mdc "imports" connect data

Comments

[Andreas Dilger]

One option is to have /proc/fs/lustre/

{osc,mdc}

/*/import also print out the data fields in obd_connect_data, in addition to just the flags. This would be useful for a number of reasons, in addition to just getting the server versions. I was just thinking that it would be good for getting the ocd_brw_size during 4MB patch testing, etc. Something like:

import:
    name: myth-OST0000-osc-ffff88004fc2d800
    target: myth-OST0000_UUID
    state: FULL
    connect_flags: [write_grant, server_lock, version, request_portal, truncate_lock, max_byte_per_rpc, early_lock_cancel, adaptive_timeouts, lru_resize, alt_checksum_algorithm, version_recovery, full20, 64bithash, object_max_bytes]
    connect_data:
        version: 2.1.3
        grant: 2097152
        index: 0
        brw_size: 4194304
        ibits_known: 0xf
        blocksize: 4096
        inodespace: 0
        grant_extent: 24
        transno: 0
        group: 0
        cksum_types: [ crc32, adler, crc32c ]
        max_easize: 4048
        instance: 4
        maxbytes: 17179869184

Note that the "instance:" field should be moved into the "connect_data" section rather than being a separate field.

[Robert Read (Inactive)]

Was just about to suggest the same thing.

[Andreas Dilger]

This was fixed with patch http://review.whamcloud.com/6588 "LU-3386 lproc: improve osc/mdc "imports" connect data" which was landed to master in commit v2_5_52_0-67-g62660c7.