Drive cache disabled

We lost a drive in our XRAID. Pulled the bad drive and put another in. It started rebuilding automatically (RAID 5) and everything is up and running. But, I noticed that drive cache is enabled for all other drives in the RAID except the new one. Is this a problem?

The Apple Drive Modules use an Apple specified firmware from the manufacturer. The RAID chassis itself relies on this. So when you replace it with off-the-shelf drives you may not get all the functionality and control, as you're seeing.
No way to fix this other than getting a drive from Apple, or in getting one with the same firmware (maybe same exact model #) that Apple uses on the 500 GB drives.

Similar Messages

Drive Cache Disabled on recently replaced RAID drive

Hello. We recently had a 250GB drive go down in the Xserve RAID at my work. Unable to get a replacement, we put a 500GB drive in. We realize that we will only get 250GB capacity out of the drive. Everything seems to be working fine, but in the RAID admin utility, the newly replaced drive has "drive cache disabled" showing, as well as "powered on hours: unknown"
My questions are: What are the consequences of this? Is this something a firmware update would fix? Any other concerns?
Thanks

The Apple Drive Modules use an Apple specified firmware from the manufacturer. The RAID chassis itself relies on this. So when you replace it with off-the-shelf drives you may not get all the functionality and control, as you're seeing.
No way to fix this other than getting a drive from Apple, or in getting one with the same firmware (maybe same exact model #) that Apple uses on the 500 GB drives.

Need to avoid exception w.r.t database when caching disabled, skip database

I have a situation here.
Want to bypass database connection if caching disabled. If caching found enable, only then try to establish a database connection.
One part of application should work when database is down as it doesn't require connection to database at all.
While other parts should throw exception when database connection not available.
the piece of code looks like this:
public byte[] getStagedSchedule(long begin, int channelID, String stage, String username, String password, Number releaseID, Number planningTypeId ) throws SchedExExportException, SecurityServiceException
byte[] ret = null;
try
Date myDate = new Date(begin);
this.stageConfig = new StageConfig(stage, new Integer(channelID), myDate);
if(!this.stageConfig.isCached())
IService service = null; //database connection not required here (can handle that part)
StageAccessService myStage = new StageAccessService(service, myDate, new Integer(channelID), stage,username, releaseID, planningTypeId);
try{
ret = myStage.getXML();
catch(SchedExExportException e){
LogUtils.getExtLogger().error("PSIStopProcessException: " + e.getMessage(), null, null, e);
throw new SchedExExportException(e);
else{
IService service = ServiceFactory.getInstance("TxSchedEx"); //database connection string
StageAccessService myStage = new StageAccessService(service, myDate, new Integer(channelID), stage,username, releaseID, planningTypeId);
ret = myStage.getXML();
if(service != null)
service.release();
catch (ServiceException e)
LogUtils.getExtLogger().error("ServiceException: " + e.getMessage(), null, null, e);
throw new SchedExExportException(e);
return ret;
Now this code is working as per my requirement. for the time being.
But have two major problems to be solved here.
1) this piece of code :
this.stageConfig = new StageConfig(stage, new Integer(channelID), myDate);
is getting called in other class as well. i.e. inside this:
StageAccessService myStage = new StageAccessService(service, myDate, new Integer(channelID), stage,username, releaseID, planningTypeId);
have initialise method. which internally calls this method:
private boolean initialize(IService service, Date date, Number channel, String stage, Number releaseId, Number planningTypeId) throws PSIStopProcessException
boolean ret = false;
if ( ( null != service ) && ( null != date ) && ( null != channel)&& ( null != stage))
this.service = service;
this.scheduleDate = date;
this.scheduleChannel = channel;
this.stageConfig = new StageConfig(stage, channel, date);
this.planningTypeId = planningTypeId;
this.givenReleaseId = releaseId;
ret = true;
initRelease(releaseId);
else if ( ( null == service ) && ( null != date ) && ( null != channel)&& ( null != stage)) // just to handle if database connection not available.
this.scheduleDate = date;
this.scheduleChannel = channel;
this.stageConfig = new StageConfig(stage, channel, date);
this.planningTypeId = planningTypeId;
this.givenReleaseId = releaseId;
ret = true;
return ret;
Because StageAccessService is the real entry point for all other classes to access information about stage (staging). (So making StageConfig singleton, won't help me)
Now is there any way i can avoid :
this.stageConfig = new StageConfig(stage, channel, date);
getting called twice in my code.
why this is required is this method checks for caching real values.
public byte[] getXML() throws SchedExExportException
byte[] ret = null;
if ( !this.stageConfig.isCached() )
ret = dynamicLoadXML();
else
ret = loadReleaseFromStage();
if (ret == null && this.stageConfig.isLazyLoading())
ret = dynamicLoadXML();
saveScheduleInStage(ret);
and so on.............
try{
if (this.stageConfig.isTransformSchedules() && ret != null)
etc
2) Other workaround can be like: check if database connection is there or not. log the exception in catch block. but don't throw back.
So that the part which doesn't require database connection can work. But if request is not calling that part, then better throw exception also.
I don't know whihc approcah is good in this case.
Can anyone suggest anything better then this.
thanks.

I'm afraid that you need to provide further info about your two databases like versions, whether they have the replication option installed etc.
Generally speaking you have two methods available:
1. Use the replication options (needs setup like repadmins, master sites, snapshots etc)
2. Script it yourself (ie rewrite the replicator :-) trough DBlinks, stored procedures etc.
I would reccommend option 1 since you do not need to re-invent the wheel.
null

Drive Cache Errors in Logs

I noticed that the same two entries in /var/log/errors are flooding my logs and I would like to know if this is an issue I can resolve or a red flag for bigger things...
Jun 2 11:18:12 ghost kernel: sd 2:2:0:0: [sda] Asking for cache data failed
Jun 2 11:18:12 ghost kernel: sd 2:2:0:0: [sda] Assuming drive cache: write through
Does anyone know whats causing the entries above and how I can resolve this?

is your drive new or old, you can ignore this message since the kernel thinks that the drive does not support caching. if your drive supports caching but the kernel is not recognizing it, you can change it yourself by using hdparm/sdparm

Debugging Drive Cache

I am writing a custom plugin using Drive 3.0.1.104. For the most part, my plugin is working well. Occasionally, however, it looks like the Drive cache is not consistent with state of the content in my CMS. When this happens, I notice the wrong context menu items will be enabled in Finder/Explorer (e.g., "Check In..." vs. "Cancel Check Out..."), and the Drive icon in InDesign does not contain a checkmark or a pencil. When I look in the logs, I will often see exceptions like "FileSystemException: Invalid Handle" or "ModelObjectNotFoundException: Cannot find class com.adobe.drive.data.internal.model.Asset with id='144'".
I assume this is due to me sending inconsistent information to Drive via the UpdateRecipe. However, since Drive is a black box and this is happening intermittently, it makes it extremely difficult to debug issues like these. Is there any way to open the hsqldb database so that I can try to understand the current state of the Drive cache? I have downloaded hsqldb, but don't have the password to get into the database.
Thanks,
Rich

The database files of Adobe Drive are under the following folder:
Win XP: C:\Documents and Settings\[current-machine-user]\Application Data\Adobe\CS5ServiceManager\database
Win 7: C:\Users\[current-machine-user]\AppData\Roaming\Adobe\CS5ServiceManager\database
Mac: /Users/[current-machine-user]/Library/Application Support/Adobe/CS5ServiceManager\database
To browse database, execute the following command to launch hsqldb util.
java -cp [path-to-hsqldb.jar] org.hsqldb.util.DatabaseManagerSwing
A 'Connect' dialog will appear. Input the following info In 'Connect' dialog to open the database.
Type: HSQL Database Engine Standalone
URL: jdbc:hsqldb:file:[path-to-database, above shows the details]/adrive-db
User: SA
Password:[no password, leave it blank]
After successfully connect to the database, you can input sql to browse database content.

Portal Drive Cache

Hi All,
I have a question about the portal drive cache.
Portal Drive is a web dav client to connect to your portal content with the windows explorer.
My problem ist that Portal Drive stores cached data on the c:\-drive, in my environment
it is C:\Documents and Settings\tfelp4\Local Settings\Application Data\Xythos\cache.
My requirement is to store the cached files on another drive like d:\, because the c-drive is already full and only
used for storing pinstallation files.
Thanks for helping me
Steve

Any ideas so far??
Thanks in advance
Thomas

Cant open pages that need log in info. I've cleared cache, disabled extensions and deleted all cookies to no avail....help!!!

Any page that requires a username and password will not open, this started last Thursday and at that time I was able to reinstate by clearing cache, disabling extension and deleting cookies. Subsequently that fix failed and now doing all those things has no effect.

I found the answer: http://forums.adobe.com/thread/1018071?tstart=0 It was a conflict with RealPlayer. Incidentally, in order to find this thread again, I had to use a google search. Is there really no way to find a person's own questions via our own profile???

After downloading itune to my dell computer (with windows vista), the DVD RW drive is disabled. The device status shows "device can not start (code 10)" Any suggestions? Thanks.

after downloading itune to my dell computer (with windows vista), the DVD RW drive is disabled. The device status shows "device can not start (code 10)" Any suggestions? Thanks.

additional info.
I have found the correct error definition in english.
"can not start the device (Code 10)"
I have updated my bios to the latest version.
I have just tried to uninstall all USB-drivers, and reinstall them.. Still no luck
I have tried to uninstall and reinstall all webcam drivers - no luck

Impact of Hard Drive Cache

What practical difference is there in using an internal hard drive with 16 vs 32 MB cache? How noticeable would the performance difference be, and under what circumstances?
Thanks.

HI-
A larger cache means more data can be held in ready access=faster performance.
The most frequently used data is held on the hard drive cache.
Cache isn't all, though.
Platter numbers and platter density are important as well.
A two platter 640GB drive with 16MB cache will outperform a 1GB 4 platter drive with 32MB cache.
The same 640GB drive at 7200 rpm also outperforms a 10k rpm drive with equal cache and only one platter.
A larger cache will help without you really noticing, save for snappier operations.
The easiest way to see, is to boot to a smaller cached drive, run some routine applications, and then reboot to the larger cached drive and run the same.
But, again, cache size isn't the whole story........

Opinions on the Turbo Memory hard drive cache

What advantage does this give? Is this just fluff?
Is the onboard hard drive cache not enough? If not, if this really did something, why wouldn't it be larger than 8mb?
I see no other companies offering this option and can't find much information on it.
Does anyone have it? Does anyone take it seriously?
Thank you
Solved!
Go to Solution.

Click Here.....it gives some good reading on Turbo Memory [courtesy of AnandTech]
\\ I do not respond to PM regarding individual tech support. Keep discussions in the forum for the benefit of others //

Default Adobe Drive cache size is only 128MB

The Adobe Drive cache size defaults to 128MB. This doesn't seem a very logical value as a single file may be easily larger than that. Is there a reason it's so small? As most users would probably benefit from a larger cache size and today's harddrives should also allow a larger cache size.
Would it make sense to have a default cache size of 5-10GB? Maybe depending on the amount of free disk space available during installation?

Hello.
To help automatically clear up some cache from Firefox, click on each of the images from left to right. Now at least you won't have to constantly do it yourself.
Also, to help you with your space issues, download Clean Master from the Google Play app Store: https://play.google.com/store/apps/details?id=com.cleanmaster.mguard this app will clean up hidden cache and useless files on your phone, helping free up space.
And as for why Firefox keeps reverting to the default cache in "about:config", I do not know. We are sorry for any inconveniences that this has caused you. But please try doing what was mentioned above to help with your issue.
Hope this helps!

L3 cache disabled!

I'm working on a dual G4 1.25ghz (FW800) and I noticed that when I look in CHUD it doesn't show the L3 cache for either processor. Also, in REGGIESE, the L3 cache checkbox is unchecked, but if I try to check it, I get a message that says it can't write to that register. Additionally, if I look at the diagnostics in the System Profiler there's a note that says that the diagnostic failed.
So here's the question -- is my L3 cache fried, or is it somehow disabled? I know there's a way to disable/enable caches on the PowerBooks, but is there a similar process on the PowerMac?
Thanks!

Okay, I've tried using the L3 Enabler program from [email protected] and here's what I got:
Powermac G4 FW800 Dual 1.25ghz
Machine Name: Power Mac G4
Machine Model: PowerMac3,6
CPU Type: PowerPC G4 (3.2)
Number Of CPUs: 2
CPU Speed: 1.25 GHz
L2 Cache (per CPU): 256 KB
Memory: 2 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.5.7f1
Last Run: 8/29/06 9:20 PM
Result: Failed
Failure type: External cache
This application has now set the pre-boot so the white screen
with gray Apple comes on and then switches to the black screen and
displays the startup process, noting errors and then moves to the
bluescreen for the system startup. This happens at each startup now.
I ran the dmesg command and it produces nothing, simply returns to the
terminal line. When I shut down the computer, it moves back to the
black screen and displays the message it is shutting down the cpus and
then shuts off.
The system seems to be running fine once it starts up but you can see
something is very wrong with the kernal now that I have used the
L3Enabler. My L3 cache is still not turned on as you can see above. I have
tried starting from another boot drive and it is the same, so the
program has done something fundamental that needs to be reset, the problem is not within the boot system.
Now I am in more trouble than before using the program!
Does anyone have a method for how to fix this??
Thanks!!!!

Firefox wont resolve any single website anymore. i tried clearing cache, disabling dns prefetching and ipv6, nothing is working, i cannot use firefox for anything anymore. what to do?

firefox no longer is able to resolve any website. nothing is loading, absolutely nothing. i tried disabling dns prefetching as well as ipv6. i als cleard all my cache and cookies. nothing is working

firefox no longer is able to resolve any website. nothing is loading, absolutely nothing. i tried disabling dns prefetching as well as ipv6. i als cleard all my cache and cookies. nothing is working

Mac OS X External Hard Drive Cache

I wanted to post this in the discussions to see if anyone knows the answer. For anyone who has used a PC extensively, you know that Windows caches all USB devices that are plugged into the computer and in order to remove the device, you need to go to "Add/Remove Hardware" and remove the USB device to completely erase any recollection of the hardware ever being connected. I plugged in a new USB device and decided that I did not want my computer to use that device or cache it. I needed to do a fresh install of Mac OS X cause of the new HD i bought but I migrated my old user account information. I also used Cache Out X to clear all system and user cache information. I have two questions from this.
1. Does Mac OS X cache USB devices once they are connected? If so where does it store that information?
2. Did reinstalling my OS remove all previously cached USB devices??
I want to delete any traces of the External USB drive I previously plugged in before the reinstall if it did get carried over in a cache or something. Thanks

USB Entries on OS X:
http://www.appleexaminer.com/MacsAndOS/Analysis/USBOSX/USBOSX.html
Kj

User Factory Cache - Disable

Hi,
I would like to disable the User Factory Cache as this is causing problems where users attributes are cached and these parameters need to be dynamic as these can change from minute to minute.
If anyone can point to me the location where this setting can be found. I am aware this is going to cause a protential performance issue.
Any useful answers will be rewarded with points.

Hi,
you can configure the UME Cache using the Config Tool and there in Global Service Configuration ->com.sap.security.core.ume.service.
In the properties list you will find the property:
ume.cache.user_account.default_caching_time
with the value:
3600
According to the documentation the value should be seconds. As it says that the user account information will be refreshed every hour by default.
I guess when you change the value to a value suitable for you and restart the cluster you can achieve your requirement.
You will find also some other properties here which can be used to adjust the other factories and values of the cache. These are more or less self explanatory.
However, I have not tested this yet. I only found these parameters lately because of an other issue with the UME cache.
Hope it helps and best regards,
Stefan Brauneis

Drive cache disabled

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