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Bug 2145213

Summary: [virtio-win] Windows 10 "Optimize drive"/Trim/Discard causes all data to be rewritten [rhel-9.1.0.z]
Product: Red Hat Enterprise Linux 9 Reporter: RHEL Program Management Team <pgm-rhel-tools>
Component: virtio-winAssignee: Vadim Rozenfeld <vrozenfe>
virtio-win sub component: virtio-win-prewhql QA Contact: Peixiu Hou <phou>
Status: CLOSED ERRATA Docs Contact:
Severity: high    
Priority: medium CC: ailan, coli, fdeutsch, gveitmic, jinzhao, juzhang, mdean, menli, qizhu, vrozenfe, ymankad
Version: 9.0Keywords: Triaged, ZStream
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: ---   
Hardware: x86_64   
OS: Windows   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
both virtio storage drivers - viostor and vioscsi can show very slow defragmintation performance on trim (unmap) enabled volumes. This can happen because the default slab (cluster) size reported by QEMU is 4K, while Windows volume defragmentation can be significantly improved if the slab size is 8MB or bigger (Windows Hyper-V uses 32MB slab size). The slab size can be adsjusted by "discard_granularity" QEMU parameter.
 Story Points: ---
Clone Of: 2020998 Environment:
Last Closed: 2023-01-23 15:20:17 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2020998    
Bug Blocks:    

Comment 1 menli@redhat.com 2022-11-24 06:21:59 UTC 
Change the status to verified.

Test build: virtio-win-prewhql-0.1-229.iso
https://bugzilla.redhat.com/show_bug.cgi?id=2020998#c28
Comment 7 errata-xmlrpc 2023-01-23 15:20:17 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (virtio-win bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:0327