id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 10031,High I/O causing filesystem corruption,Indigo42,,"Hello, We are running an Ubuntu 10.04 32bit guest on a RHEL 64 bit host. The guest storage control is SATA AHCI with host I/O caching enabled. Host info: OS Type: Linux (2.6.18-194.el5) VirtualBox: 4.1.4 (74291) Processors: Intel(R) Xeon(R) CPU 3060 @ 2.40GHz (2) HWVirtEx, PAE, Long Mode (64-bit) It seems during times of high I/O, like backups and etc, the guest filesystem resets to read-only. We have this issue with both ext3 and ext4 filesystems. Switching to ext3 seemed to lessen the occurrences though. Here is a snip of syslog around the time of the corruption.. {{{ Dec 15 08:01:48 vault sm-mta[1437]: rejecting connections on daemon MTA-v4: load average: 12 Dec 15 08:01:48 vault sm-mta[1437]: rejecting connections on daemon MSP-v4: load average: 12 Dec 15 08:02:03 vault sm-mta[1437]: rejecting connections on daemon MTA-v4: load average: 12 Dec 15 08:02:03 vault sm-mta[1437]: rejecting connections on daemon MSP-v4: load average: 12 Dec 15 08:02:18 vault sm-mta[1437]: rejecting connections on daemon MTA-v4: load average: 12 Dec 15 08:02:18 vault sm-mta[1437]: rejecting connections on daemon MSP-v4: load average: 12 Dec 15 08:02:29 vault kernel: [ 2338.011698] ata4.00: exception Emask 0x0 SAct 0xffff SErr 0x0 action 0x6 frozen Dec 15 08:02:29 vault kernel: [ 2338.011714] ata4.00: failed command: WRITE FPDMA QUEUED Dec 15 08:02:29 vault kernel: [ 2338.011721] ata4.00: cmd 61/00:00:b7:5c:9d/04:00:09:00:00/40 tag 0 ncq 524288 out Dec 15 08:02:29 vault kernel: [ 2338.011723] res 40/00:00:00:00:00/00:00:00:00:00/40 Emask 0x4 (timeout) Dec 15 08:02:29 vault kernel: [ 2338.011726] ata4.00: status: { DRDY } Dec 15 08:02:29 vault kernel: [ 2338.011729] ata4.00: failed command: WRITE FPDMA QUEUED Dec 15 08:02:29 vault kernel: [ 2338.011736] ata4.00: cmd 61/00:08:77:31:9d/04:00:09:00:00/40 tag 1 ncq 524288 out Dec 15 08:02:29 vault kernel: [ 2338.011737] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) Dec 15 08:02:29 vault kernel: [ 2338.011740] ata4.00: status: { DRDY } Dec 15 08:02:29 vault kernel: [ 2338.011743] ata4.00: failed command: WRITE FPDMA QUEUED Dec 15 08:02:29 vault kernel: [ 2338.011749] ata4.00: cmd 61/00:10:77:35:9d/04:00:09:00:00/40 tag 2 ncq 524288 out Dec 15 08:02:29 vault kernel: [ 2338.011751] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) }}} And then later on in the file.... {{{ Dec 15 08:02:29 vault kernel: [ 2338.011969] ata4: hard resetting link Dec 15 08:02:29 vault kernel: [ 2338.332268] ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Dec 15 08:02:33 vault kernel: [ 2342.108804] ata4.00: configured for UDMA/133 Dec 15 08:02:33 vault kernel: [ 2342.108811] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108815] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108818] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108820] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108823] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108826] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108829] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108831] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108834] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108837] ata4.00: device reported invalid CHS sector 0 Dec 15 08:02:33 vault kernel: [ 2342.108840] ata4.00: device reported invalid CHS sector 0 }}} At this point the guest needs to be shut down and the drive mounted and fsck, which complains about allot of IO handle stuff.",defect,reopened,virtual disk,VirtualBox 4.1.4,,,,Linux,Linux