[LU-4397] Permanently disabled OST causes clients to hang on df (statfs)

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.6.0, Lustre 2.5.2
• Affects Version/s: Lustre 2.4.1
• Environment: RHEL6 2.6.32-358.18.1.el6.x86_64

Epic/Theme

OST client

• Severity: 4

Epic

client hang

• Assignee: WC Triage
• Reporter: Wolfgang Baudler

Description

A no longer existing OST has been permanently disabled on the MGS using

lctl conf_param vegas-OST0059.osc.active=0

After this, clients hang on df (after lustre is remounted the next time). strace shows it hanging on a statfs call.

Tried with the lustre mount option lazystatfs (undocumented?) which is supposed to work around this issue, but it did not help with lustre 2.4.1, clients still hang on df. This is the standard df, lfs df seems to work OK.

Issue Links

• duplicates: LU-4010 Don't wait for active target if OBD_STATFS_NODELAY flag is set.
• is related to: LU-7668 permanently remove deactivated OSTs from configuration log