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Bug #3794
open
Sequential IO on ZFS exhibits factor >13 slowdown when not aligned to record boundaries.
Status:
New
Priority:
Normal
Assignee:
-
Category:
zfs - Zettabyte File System
Start date:
2013-05-28
Due date:
% Done:
0%
Estimated time:
Difficulty:
Hard
Tags:
needs-triage
Gerrit CR:
External Bug:
Description
It seems that using dd to write a large sequential file with bs=131072 is quick while bs=65536 exhibits a factor of >13 slowdown. This has been observed on both Linux and Solaris 10u10. This appears to be a write-hole caused by an absence of write coalescing. Full details are available at the ZFSOnLinux issue:
https://github.com/zfsonlinux/zfs/issues/361
This is not something that the ZFSOnLinux project should tackle by itself, so I decided to file an upstream issue.
Updated by Rich Lowe over 10 years ago
- Project changed from site to illumos gate
Updated by Rich Lowe over 10 years ago
- Category set to zfs - Zettabyte File System
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