Bug 828949
| Summary: | bad ext4 sync performance | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Ing. Christoph Pirchl <christoph.pirchl> |
| Component: | kernel | Assignee: | Red Hat Kernel Manager <kernel-mgr> |
| Status: | CLOSED WONTFIX | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 5.8 | CC: | christoph.pirchl, rwheeler |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2014-06-02 13:17:18 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Can you please open a support request through your official Red Hat support channel? Our support team do first line support, Red Hat bugzilla is not intended to be a path around that. If you do not have a Red Hat support entitlement, you should take your issues to the upstream mailing list for community support (linux-ext4 list for this issue). Best regards, Ric This bug/component is not included in scope for RHEL-5.11.0 which is the last RHEL5 minor release. This Bugzilla will soon be CLOSED as WONTFIX (at the end of RHEL5.11 development phase (Apr 22, 2014)). Please contact your account manager or support representative in case you need to escalate this bug. Thank you for submitting this request for inclusion in Red Hat Enterprise Linux 5. We've carefully evaluated the request, but are unable to include it in RHEL5 stream. If the issue is critical for your business, please provide additional business justification through the appropriate support channels (https://access.redhat.com/site/support). |
Description of problem: We do have a HP BL 465c G5 BladeServer with 32 GB RAM in a 6 Node RHEL Cluster attached to our Cisco SAN and there are several LUN's presented over FalconStor SAN Virtualization. When we write with dd on a 8 TB ext4 LUN we see a really bad sync performance. [root@iconode01-sr1 data13]# df -h |grep data01 7.7T 7.2T 352G 96% /archive/data01 [root@iconode01-sr1 data01]# /usr/bin/time bash -c "dd if=/dev/zero of=test_10GB.file bs=1M count=10000 && sync" 10000+0 records in 10000+0 records out 10485760000 bytes (10 GB) copied, 810.616 seconds, 12.9 MB/s 0.02user 413.71system 13:34.55elapsed 50%CPU (0avgtext+0avgdata 6512maxresident)k 0inputs+0outputs (0major+756minor)pagefaults 0swaps Writing on an 2 TB ext3 Partition on a HP Storage Systems is working fine [root@iconode01-sr1 data13]# df -h |grep data13 2.0T 12G 2.0T 1% /eva8100-sr1/data13 [root@iconode01-sr1 data13]# /usr/bin/time bash -c "dd if=/dev/zero of=test_10GB.file bs=1M count=10000 && sync" 10000+0 records in 10000+0 records out 10485760000 bytes (10 GB) copied, 37.2399 seconds, 282 MB/s 0.02user 34.03system 1:04.57elapsed 52%CPU (0avgtext+0avgdata 6512maxresident)k 0inputs+0outputs (0major+757minor)pagefaults 0swaps It`s like in Bug 572930 but we have a newer kernel where these issues should be fixed. Version-Release number of selected component (if applicable): [root@iconode01-sr1 data01]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 5.8 (Tikanga) [root@iconode01-sr1 data01]# uname -a Linux iconode01-sr1.tilak.ibk 2.6.18-308.el5 #1 SMP Fri Jan 27 17:17:51 EST 2012 x86_64 x86_64 x86_64 GNU/Linux How reproducible: always Steps to Reproduce: 1. create 8 TB LUN 2. create GPT Partition with parted 3. mkfs.ext4 /dev/mapper/AIM_Archive_DATA01p1 Actual results: Bad Performance Expected results: Should be much faster Additional info: Is there a Problem with full Partitions, the ext4 Partition is full to 96% ? On other ext4 Partition, who are not "so full", the performance is slightly better.