Bug 1032674 - Make default physical block size 4K
Summary: Make default physical block size 4K
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Kevin Wolf
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On: 748906
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-11-20 14:58 UTC by Paolo Bonzini
Modified: 2016-08-01 20:35 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-08-01 20:35:38 UTC
Target Upstream Version:

Attachments (Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

Description Paolo Bonzini 2013-11-20 14:58:30 UTC 
For RHEL7.0, making physical block size 4K will make XFS use 4K blocks, and will avoid RMW operations when writing to the journal.

This is not expected to bring benefits for anything other than XFS, since LVM and parted are usually aligning things to 1MB anyway.

This is also the first step towards providing 4K native disks.  However, this requires UEFI support.
Comment 8 Kevin Wolf 2016-06-21 15:32:21 UTC 
Paolo, do we still want this? I don't expect it to make a difference in practice
and apparently nobody was interested enough to bring it up again, but maybe it's
time to just make the change or close the BZ...
Comment 9 Paolo Bonzini 2016-07-15 07:14:48 UTC 
I say close it... We can just do it upstream, there's no need for a BZ.
Comment 10 Kevin Wolf 2016-08-01 20:35:38 UTC 
Ok, makes sense, I'm closing it now.
Note You need to log in before you can comment on or make changes to this bug.