I installed all the certificate but unfortunately there is still a problem
As we’ve seen previously, OneFS utilizes file system scans to perform such tasks as detecting and repairing drive errors, reclaiming freed blocks, etc. These scans are typically complex sequences of operations which may take many hours to run, so they are implemented via syscalls and coordinated by the Job Engine. These jobs are generally intended to run as minimally disruptive background tasks in the cluster, using spare or reserved capacity.
The file system maintenance jobs which are critical to the function of OneFS are:
|
FS Maintenance Job |
Description |
|
AutoBalance |
Restores node and drive free space balance |
|
Collect |
Reclaims leaked blocks |
|
FlexProtect |
Replaces the traditional RAID rebuild process |
|
MediaScan |
Scrub disks for media-level errors |
|
MultiScan |
Run AutoBalance and Collect jobs concurrently |
MediaScan’s role within the file system protection framework is to periodically check for and resolve drive bit errors across the cluster. This proactive data integrity approach helps guard against a phenomenon known as ‘bit rot’, and the resulting specter of hardware induced silent data corruption.
The MediaScan job reads all of OneFS’ allocated blocks in order to trigger any latent drive sector errors in a process known as ‘disk scrubbing’. Drive sectors errors may occur due physical effects which, over time, could negatively affect the protection of the file system. Periodic disk scrubbing helps ensure that sector errors do not accumulate and lead to data integrity issues.
Sector errors are a relatively common drive fault. They are sometimes referred to as ‘ECCs’ since drives have internal error correcting codes associated with sectors. A failure of these codes to correct the contents of the sector generates an error on a read of the sector.
ECCs have a wide variety of causes. There may be a permanent problem such as physical damage to platter, or a more transient problem such as the head not being located properly when the sector was read. For transient problems, the drive has the ability to retry automatically. However, such retries can be time consuming and prevent further processing.
OneFS typically has the redundancy available to overwrite the bad sector with the proper contents. This is called Dynamic Sector Repair (DSR). It is preferable for the file system to perform DSR than to wait for the drive to retry and possibly disrupt other operations. When supported by the particular drive model, a retry time threshold is also set so that disruption is minimized and the file system can attempt to use its redundancy.
In addition, MediaScan maintains a list of sectors to avoid after an error has been detected. Sectors are added to the list upon the first error. Subsequent I/Os consult this list and, if a match is found, immediately return an error without actually sending the request to the drive, minimizing further issues.
If the file system can successfully write over a sector, it is removed from the list. The assumption is that the drive will reallocate the sector on write. If the file system can’t reconstruct the block, it may be necessary to retry the I/O since there is no other way to access the data. The kernel’s ECC list must be cleared. This is done at the end of the MediaScan job run, but occasionally must also be done manually to access a particular block.
The drive’s own error-correction mechanism can handle some bit rot. When it fails, the error is reported to the MediaScan job. In order for the file system to repair the sector, the owner must be located. The owning structure in the file system has the redundancy that can be used to write over the bad sector, for example an alternate mirror of a block.
Most of the logic in MediaScan handles searching for the owner of the bad sector; the process can be very different depending on the type of structure, but is usually quite expensive. As such, it is often referred to as the ‘haystack’ search, since nearly every inode may be inspected to find the owner. MediaScan works by directly accessing the underlying cylinder groups and disk blocks via a linear drive scan and has more job phases than most job engine jobs for two main reasons:
Here are the eight phases of MediaScan:
|
Phase # |
Phase Name |
Description |
|
1 |
Drive Scan |
Scans each drive using the ifs_find_ecc() system call, which issues I/O for all allocated blocks and inodes. |
|
2 |
Random Drive Scan |
Find additional “marginal” ECCs that would not have been detected by the previous phase. |
|
3 |
Inode Scan |
Inode ECCs can be located more quickly from the LIN tree, so this phase scans the LIN tree to determine the (LIN, snapshot ID) referencing any inode ECCs. |
|
4 |
Inode Repair |
Repairs inode ECCs with known (LIN, snapshot ID) owners, plus any LIN tree block ECCs where the owner is the LIN tree itself. |
|
5 |
Inode Verify |
Verifies that any ECCs not fixed in the previous phase still exist. First, it checks whether the block has been freed. Then it clears the ECC list and retries the I/O to verify that the sector is still failing. |
|
6 |
Block Repair |
Drives are scanned and compared against the list of ECCs. When ECCs are found, the (LIN, snapshot ID) is returned and the restripe repairs ECCs in those files. This phase is often referred to as the “haystack search”. |
|
7 |
Block Verify |
Once all file system repair attempts have completed, ECCs are again verified by clearing the ECC list and reissuing I/O. |
|
8 |
Alert |
Any remaining ECCs after repair and verify represent a danger of data loss. This phase logs the errors at the syslog ERR level. |
MediaScan falls within the job engine’s restriping exclusion set, and is run as a low-impact, low-priority background process. It is executed automatically by default at 12am on the first Saturday of each month, although this can be reconfigured if desired.
In addition to scheduled job execution, MediaScan can also be initiated on demand. The following CLI syntax will kick off a manual job run:
# isi job jobs start mediascan
Started job [251]
# isi job jobs list
ID Type State Impact Pri Phase Running Time
——————————————————–
251 MediaScan Running Low 8 1/8 1s
——————————————————–
Total: 1
The MediaScan job’s progress can be tracked via a CLI command as follows:
# isi job jobs view 251
ID: 251
Type: MediaScan
State: Running
Impact: Low
Policy: LOW
Pri: 8
Phase: 1/8
Start Time: 2018-08-30T22:16:23
Running Time: 1m 30s
Participants: 1, 2, 3
Progress: Found 0 ECCs on 2 drives; last completed: 2:0; 0 errors
Waiting on job ID: –
Description:
A job’s resource usage can be traced from the CLI as such:
# isi job statistics view
Job ID: 251
Phase: 1
CPU Avg.: 0.21%
Memory Avg.
Virtual: 318.41M
Physical: 28.92M
I/O
Ops: 391
Bytes: 3.05M
Finally, upon completion, the MediaScan job report, detailing all eight stages, can be viewed by using the following CLI command with the job ID as the argument:
# isi job reports view 251
You can never really predict when something will go wrong with Outlook. The extremely user-friendly and efficient email client can easily get bogged down due to several reasons causing a complete halt to the mail send-receive operation. More often than not, the cause behind an ill-functioning Outlook application is a damaged PST file. Here in this article we will explain about the methods to solve the “error detected in Outlook PST file”.
As inconvenient as encountering an error like this is, what’s more unpleasant is the effect of such a happening. From a failed send-receive operation to an Outlook crash to complete mailbox inaccessibility, you could end up facing any depending upon how bad the situation is. And by “situation” here we mean damage in your Outlook PST file.
So why do PST files become corrupted?
There could be many reasons triggering PST file corruption:
A quick look at the above causes is enough to understand that many of them are unpreventable. While a simple anti-virus update or procurement of a UPS may keep two triggers at bay, other unwanted situations might arise without any apparent doing of your own. That was probably why Microsoft decided to ship a default PST repair utility with its MS Office application suite.
ScanPST.exe and its usage
The Inbox Repair Utility or ScanPST.exe that Microsoft provides is a handy way to detect and fix minor damages and corruptions within Outlook PST files. This application is the simplest way to perform a basic recovery operation on PST files in order to revive a failing Outlook. Here’s how you can use this utility to fix a damaged PST:
1. Navigate to C:Program FilesMicrosoft OfficeOffice 12 and double-click on the file ScanPST.exe
2. Click on ‘Browse’ and select the PST file which is to be repaired
3. Click on ‘Start’ to instruct the tool to scan the file for damages. If any discrepancies are found, the tool will display a proper message indicating as much as well as a prompt to repair the file
4. Select the option to ‘Make a backup of scanned file before repairing’ and then click on ‘Repair’ button to fix the problems within the PST
5. When the operation completes, re-launch Outlook and verify if everything works as expected.
While this approach is extremely simple and of course free of cost, it suffers from a few limitations:
A better approach
In order to overcome the limitations of ScanPST.exe and to make the repair operation much more efficient and easy, the usage of an advanced and sophisticated Outlook PST repair tool is recommended. Such a tool can not only simplify the process, it can ensure that your Outlook PST is rid of all problems in the most non-destructive way without causing any unintentional harm to the data contained within.
Among the wide variety of PST repair applications available online, the most reliable and proficient one is Stellar Phoenix Outlook PST Repair. This software is a competent and reliable way to rid a severely damaged PST file of errors and make Outlook function smoothly. The tool is backed by some very intricate algorithms that enable it to quickly scan corrupt PST files and repair them to restore all mailbox contents to a new blank PST in their original format. Additionally, the software comes with a ton of impressive features which make it a must-have for all Outlook users.
Conclusion
There can be multiple reasons for Outlook data file (PST) corruption which lead to Outlook crashing with the “error detected in Outlook PST file” message. While some underlying problems can be fixed by just upgrading your Outlook or antivirus version, others might need you to repair the damaged PST file with ScanPST.exe. But if that doesn’t work, without any hesitation you should entrust the job of accurately and safely repairing the file to Stellar Phoenix Outlook PST Repair software.
References:
Download Free ScanPST.exe Alternative for Outlook PST File
Outlook PST powers the smooth functioning of Outlook by acting as a safe-house for all emails, contacts, calendar entries, notes, etc. associated with user mailboxes. However, with time and continued usage, data keeps piling up within PST files pushing them towards size limit breach and eventual corruption. The ScanPST.exe utility offered by Microsoft comes handy to detect and fix errors and corruption within PST files. While it works in most situations, sometimes it can fail due to several reasons and throw cryptic errors like the ‘Fatal Error 80040818’ leaving users confused and clueless as to what should be done next.
Read on to find out everything there is to know about this error and how you can fix it without much trouble.
Causes that trigger ‘Fatal Error 80040818’
Outlook supports PST files of two formats – ANSI and Unicode. Outlook versions 2002 and earlier supported ANSI format PST files which were bound by a 2GB size limit. This limit was extended to 20GB for Unicode format PST files supported by Outlook versions 2003 and beyond. The amount of data that your Outlook PST can handle therefore depends on the format in which it is encoded. Whenever the size of the PST file approaches its limit, it starts facing the threat of corruption.
Other causes of PST file corruption include:
If your Outlook PST file has been corrupted owing to any of the above mentioned reasons, you are bound to face problems. Resolving them at the earliest is the only way to get back to work.
Solutions to ‘ScanPST.exe fails with fatal error 80040818’
The Inbox Repair utility ScanPST.exe offered by Microsoft is the first method used by most Outlook users to detect and fix corruptions and other errors within PST files. However, in cases of severe PST corruption, this utility fails to perform its task and terminates throwing errors like ScanPST.exe fails with fatal error 80040818. In such cases, you can try out one of the below mentioned techniques to fix the issue:
Though these tricks should help you fix the problem, if the error still doesn’t budge, read the next section to find out our pick for the best PST repair software which will empower you to defeat this error for sure.
Sure-shot remedy for PST file corruption
Extensive research across various popular technical forums point out that the best Outlook repair utility available online is Stellar Phoenix Outlook PST Repair. Powered by advanced scanning and repair algorithms, this software can easily detect and repair corruption within PST files and rid it off all nasty errors. The process is non-intrusive and non-destructive so the format of your PST file data isn’t modified in any way during the repair. A simple 3-step approach (Scan-Preview-Save), fully interactive GUI, and tons of other associated benefits make this software the ideal choice to fix problems like Fatal Error: 80040818.
Wrapping it up
Getting on top of PST file corruption is easy when you have inbuilt utilities like ScanPST.exe. However, such utilities fail when severe corruption strikes. Thus, keeping reliable professional software like Stellar Phoenix Outlook PST Repair handy is the best way to handle such errors.
References:
PST Repair Tool to Recover All Outlook Mailbox Items – Free Trial
I used symantec ghost 11.0 backup my C drive as a gho image, when using this image recovery my partition, when it go to 50%, it prompted “out error file to the following location”, when the choice is confirmed, it prompted “Ghost has detected corruption in the image file,please perform an integrity check on the image”and then it quited. When using Ghost Explorer to open the image file, it prompted ” Please select the last section in the image file. “when selecting Cancel, it prompted” Image file contains errors or the media is not ready “and then it quited.Then file in the image is important,could some one tell me how can I recover the image?
Thank you very much!
Hi all,
I want to know a few things about this HI templates.
All the password checkings that this policy do is about domain, local or SEP password?
For ex. Pass length, complex.
Another question is about error messages because I have this error message:
Fail to execute Host Integrity check.
Error Type: 0x00400020, Error Code: 0x00000000
But the host integrity runs and works fine (For example the policy disabled what I want to).
If anyone could help it would be great.
Thanks in advance!
We have checked all the log files in Opti server and Data Server and couldn’t find any error during “Solve” process. We suspect that populating data for saving back to database has some issue and it cause the corrupted data. As said earlier, the error happens intermittently.
Please help advise how to fix it.
| Details | |
| Product: | Exchange |
| Event ID: | 8230 |
| Source: | EXCDO |
| Version: | 6.5.7596.0 |
| Message: | An inconsistency was detected in %2: %3. The calendar is being repaired. If other errors occur with this calendar, please view the calendar using Microsoft Outlook Web Access. If a problem persists, please recreate the calendar or the containing mailbox. |
| Explanation | |
|
This Warning event is logged when a problem with a Calendar item is detected. This indicates that Microsoft® Exchange Server has detected data corruption and is trying to rebuild the calendar data for Web client viewing. Calendar item corruption is usually caused when file system-based antivirus software scans the Exchange Installable File System (IFS) drive. By default, the Exchange IFS drive is drive M. Corruption can also occur when you try to back up drive M. The following articles in the Microsoft Knowledge Base may apply:
Other events in the Application log may give you more information about why this event was logged and where the corruption exists. The following events may help you discover the underlying cause of this error:
|
|
| User Action | |
|
To resolve this error, try one or more of the following:
|
|
| Details | |
| Product: | SQL Server |
| Event ID: | 7984 |
| Source: | MSSQLServer |
| Version: | 9.0 |
| Component: | SQLEngine |
| Symbolic Name: | DBCC2_PRE_CHECKS_BAD_PAGE_TYPE |
| Message: | System table pre-checks: Object ID O_ID. Page P_ID has unexpected page type PAGETYPE. Check statement terminated due to unrepairable error. |
| Explanation | |
|
A page with a type other than DATA_PAGE was found in the data level of the specified object. This error is raised during the first phase of the DBCC CHECKDB command checks. During this phase, DBCC CHECKDB performs primitive checks on the data pages of critical system base tables. Note: If any errors are found in the system tables, the errors cannot be repaired; therefore, the DBCC CHECKDB command ends immediately. |
|
| User Action | |
| Look for Hardware Failure
Run hardware diagnostics and correct any problems. Also examine the Microsoft Windows system and application logs and the SQL Server error log to see whether the error occurred as the result of hardware failure. Fix any hardware-related problems that are contained in the logs. If you have persistent data corruption problems, try to swap out different hardware components to isolate the problem. Check to make sure that the system does not have write-caching enabled on the disk controller. If you suspect write-caching to be the problem, contact your hardware vendor. Finally, you might find it useful to switch to a new hardware system. This switch may include reformatting the disk drives and reinstalling the operating system. Restore from Backup If the problem is not hardware related and a known clean backup is available, restore the database from the backup. Run DBCC CHECKDB Not applicable. This error cannot be repaired automatically. If you cannot restore the database from a backup, contact Microsoft Service and Support (CSS). |
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