Flash Cache - what is it?

Similar Questions

• Update 24GB flash Cache hard drive for some other SSD acceleration

  Hello Experts,

  I plan to buy-

  HP ENVY 15 t-j100 Quad Edition Notebook PC (ENERGY STAR)

  -With

  • 1 TB 5400 RPM hard drive
  • 24GB flash acceleration Cache hard drive

  What can I upgrade (/replace) 24GB flash Cache acceleration of the drive with some other SSD whose greater storage size on the line after a few days? for example 240GB Crucial SSD?

  Thank you.

  It's different. Any other animal. It looks like a wireless card. See below. What you could do with a standard 2.5-inch SSD is to replace the original main drive. If you could total of 240 concerts that would be OK. You will need to remove the disc from mSATA (aka WSSD) as it is useless in a WSSD Accelerator reader when you have a main SSD drive. I guess that I encourage you to wait and see how you like the stock configuration. The WSSD throttle control is very effective and can make even a 5400 RPM hard drive mechanics work almost as fast as an SSD.

  

• ZBOOK 17 - Flash Cache & general system failure

  Greetings,

  History:

  On my first install of windows on my 17 Zbook, the operating system installed the system reserved on the flash SSD cache partition. I thought I'd do a reinstall when I ordered and installed a 1 TB SSD. I removed all hard drives and flash installed the operating system cache, then turned off the computer and re-installed the cache flash. Now when I try to boot it gives me 5 flashes on the caps/NumLock with a pretty black screen.

  Has anyone encountered this before? All I could do to fix it? Thanks in advance,

  Ryan

  Thanks for the reply. I'll be sure to do that next time.

  I eventually found how to fix it. I removed all the readers, disconnected from all power and then removed the BIOS battery. He gave some time, clinging to power, and she came back to life. Of course he gave me some error messages, but after removing the power again and reconnect all devices (the ssd of 32 GB samsung flash cache included) then turn it on, everything was back to normal.

  No idea why she wanted to play dead but at least he's back running.

• Cannot complete logoff Hotmail without deleting cookies & cache, what has changed?

  Cannot complete the logoff Hotmail recently without deleting cookies & cache, what has changed? I don't intend to do that each time only.

  Hello Vince_71,

  The best place to ask your question of Windows Live is inside Windows Live help forums. Experts specialize in all things, Windows Live, and would be delighted to help you with your questions. Please choose a product below to be redirected to the appropriate community:

  Windows Live Mail

  Windows Live Hotmail

  Windows Live Messenger

  Looking for a different product to Windows Live? Visit the home page Windows Live Help for the complete list of Windows Live forums to www.windowslivehelp.com.

• How to confirm the object was pinned in the flash cache exadata

  Hello

  I just wanted to confirm, if the object has been pinned in flash cache

  SQL > select nom_segment, cell_flash_cache from user_segments WHERE where cell_flash_cache = 'KEEP ';

  no selected line

  SQL > alter table scott.emp storage (cell_flash_cache) keep;

  Modified table.

  SQL > select * from scott.emp;

  SQL > select nom_segment, cell_flash_cache from user_segments WHERE where cell_flash_cache = 'KEEP ';

  no selected line.

  Here you go...

  Exadata Smart's scans and the Flash Cache

• Smart Flash Cache

  Please, can someone confirm if Smart Cache Flash is supported on 11 G R2 Standard Edition?

  I understand that it is only supported on the operating systems Solaris 11 and OEL

  I ask because I get the error below to start the DB after you configure the init parameters

  ORA-00439: feature not enabled: Flash Cache Server

  Download the Enterprise edition

  concerning

  Pravin

• Expectations of reading Flash Cache

  I start looking for flash caching. We lack version 5.5 on Dell PE servers connected to a PS6000 EQ. We have been hitting our max IOPS fairly regularly on the equalizer. We have a few writing intensive VMs Windows doing statistical analysis and some Linux VM a web hosting infrastructure. The average ratio of writing on the EQ is high enough, usually 90%, because some of the Windows virtual machines are very active, while everything else is fairly inactive. When some of the Windows virtual machines get his job stat, we begin to see latency on web VMs, especially those that host the databases (as you know).

  I understand the flash read cache will not help high write workloads, but it would help individual web virtual machines who see some latency no - is that correct?

  Also, I am reading the guide of best practices flash cache, but I was wondering if anyone had advice from real world for the size of the cache on the VMS or thoughts on the use of some of the ssd for the swap of the host. If we put an ssd in each of our hosts, should set us aside a certain percentage for the swap to host?

  Thank you.

  Tim

  Unless you have problems with memory capacity, I wouldn't worry too much on the caching of the swap host.  If you are out of memory, then consider adding more ram or evolution and the addition of several hosts.

  As for the flash cache, did consider you - PernixData - you can speed up both read and write performance, which gives to your configuration, I think that would be the type of solution, you should consider caching.

• My sound became STRONG after it gets imported into Flash. What is going on?

  This is the first time I had this problem. I record the sound in WavePad and then import into Flash. When I import it the sound extends just to the ground screaming. I pulled out and he does again but whenever it is ablaze in Flash. What is going on?

  kglad was wrong. It was this means say to serve not 44.1 Kbps as the data, the sampling frequency of 44.1 KHz rate. The sampling rate can be the cause of the problem, but the bit depth of sound is more likely. Flash cannot deal with 32-bit audio.

  Then, open the sound in the sound editor and do a save as and select as sampling frequency 44.1 KHz and 16 bit as the bit depth. It's more likely to work in Flash.

• Question about smart flash cache

  If my entire db is less than the amount of smart flash cache that is available, Exadata would automatically cache entire DB in smart flash cache?
  I understand I can say Exadata at the tables of the PIN in the cache but just curious if Exadata would on its own in this scenario.
  Thank you.

  user12254641 wrote:
  If my entire db is less than the amount of smart flash cache that is available, Exadata would automatically cache entire DB in smart flash cache?

  No, it not being cached everything simply because the DB is longer than the Smart Flash Cache. Caching is performed because of access to data, so frequently accessed data will be cached. Given at the cold end of the LRU algorithm gets years off and replaced.

  It is very similar to the DB buffer cache - you don't expect all your data to cache simply because the cache DB is greater than your data. However, if the frequently accessed data can all be cached, it will be.

  --
  Kind regards
  Greg Rahn | blog | Twitter | LinkedIn

• Need advice from configuration to the flash cache multi-node RAC/ASM

  We have a database of CARS to work two nodes. We install a new fusion 640 GB flash card in each node. The is a double card, so that it shows up as two devices: / dev/fioa and/dev/fiob on each node.
  We have created two groups of private drives, one on each node. The Group of disks on node 1 is '+ FLASHCACHE' and the disk on node 2 group is "+ FLASHCACHE2".
  
  We have not found specific examples of how to configure the parameters of the init for flashcache on RAC/ASM. We guess that we must do the following. If anyone would be critical and confirm or suggest something different, we would appreciate it very much!
  
  "prod1.db_flash_cache_file ='+ FLASHCACHE/flash1"
  prod2.dg_flash_cache_file = '+ FLASHCACHE2/flash2'
  * .db_flash_cache_size = 600G
  
  Thanks for any advice.
  
  Jim
  
  Published by: jimbev90 on January 5, 2012 08:18

  Hi Jim,.

  prod1.db_flash_cache_file='+FLASHCACHE/flash1'
  prod2.dg_flash_cache_file='+FLASHCACHE2/flash2'
  *.db_flash_cache_size=600G
  

  Your configuration is correct.

  Smart Flash Cache database is not shared across RAC nodes. It is private to each RAC instance. For this reason, each RAC instance must define its own local cache of flash file path. When the flash cache is managed by ASM, a separate diskgroup is necessary for each instance flash cache.

  You can use ALTER SYSTEM for db_flash_cache_size set to zero to disable the flash cache. Alternatively, you can use ALTER SYSTEM to deliver the flash cache to its original size to reactivate it.

  Read this white paper Oracle database Smart Cache Flash
  http://www.Oracle.com/technetwork/articles/systems-hardware-architecture/Oracle-DB-smart-Flash-cache-175588.PDF

  Kind regards
  Levi Pereira

• TimesTen VS smart flash cache

  Hello
  
  I know that Flash Cache is slower than RAM, but can we say that doesn't cache smart flash the same work as the Oracle TimesTen Database Cache?
  Wrong or right?
  
  Thank you very much for helping me in my understanding.
  
  Edited by: 905160 Dec 30. 2011 00:58

  Bad :-) Smart Flash Cache is still in the storage layer and so does nothing to eliminate the code path heavy of a disc centered on the RDBMS. One of the main advantages of TimesTen is there a short circuit code path a lot thanks to its simple design and optimizations in the memory. There is a large part of the improved source performance. Also smart flash cache does not all access operations, but only those that use the smart cache.

  Smart Flash Cache is a great way to help the performance of a focused database on disk and it is used wisely in the Exadata buffer. But you should consider not equivalent to, or a substitiute for, cache TimesTen in-Memlory database. These are very different things, work very differently from each other and offer different benefits.

  Chris

• Flash cache initialization settings

  Hi, I recently got patched up OEL and works with a flash mounted on my system drive... I now want to have a play around with oracle flash cache...
  
  I need set the following... db_flash_cache_file and db_flash_cache_size
  
  could someone help me with the syntax to do? is this something in the sense of
  
  ALTER system set db_flash_cache_file ='/ media/ssd /';
  
  ALTER system set db_flash_cache_size = "xxgb"?
  
  Any help would be appreciated
  
  
  for example, I tried...
  
  SQL > alter system set db_flash_cache_file ='/ media/ssd /';
  ALTER system set db_flash_cache_file ='/ media/ssd /'
  *
  ERROR on line 1:
  ORA-02095: specified initialization parameter is not editable
  
  Published by: user9200169 on August 11, 2010 09:50

  so, when I select * from v$ version and it said 11.2.0.1.0...

  even if I have the version 11.2.0.1.2 due to the application of the fix 9654983?

  Yes. I think that Oracle would call it version no version. If search you metalink patch 8974084 you will see the patch for versions/versions: 11.2.0.1.0 and 11.2.0.1.1.

  to remedy this situation all I should follow the steps below:

  1 restore 9654983
  2. apply 9352237
  3 then apply 8974084

  ... then the flash cache must be enabled?

  fix. do not forget to enter 8974084 for 11.2.0.1.1.

  -ap

• What Flash Cache completely transparent? Can I see the contents of a cache of flash?

  Hello
  
  is it possible to see the contents of a cache flash as v$ bh?

  On the layer of cells, you can make

  CellCLI> list flashcachecontent
  

  Which returns more info on flashcached objects, among other the objectnumber you can recover on the layer of database with DBA_OBJECTS (object_id here).
  As far as I KNOW, there is no direct view of the data for this layer.

  Kind regards
  Uwe Hesse

  http://uhesse.WordPress.com

  P. S.

  Example to look at several cells for FlashCache to some table information:

  dcli -g cells.txt "cellcli -e list flashcachecontent attributes cachedKeepSize,cachedSize,hitCount where objectnumber=75698"
  

  Use of dcli as above is explained here:
  http://uhesse.WordPress.com/2011/03/22/Exadata-part-VI-cell-administration-with-DCLI/

  Published by: Uwe Hesse on 22.03.2011 14:22
  Added the dcli component

• vSAN 5.5 U2 - Flash Cache error reading configuration ' reason: an error occurred during the configuration of the host.

  Hosts: DL360 G6, dual quad core, 64 GB of RAM

  Discs: 3 SAS 10K rpm and 2 SSD Spidles.

  I am trying to set up one of the hosts of Read Cache Flash but I get the desciptive never so much and the defenseless error message...

  "Configuration on disk/vmfs/device/disks/naa. < longguid > has failed. "Reason: an error occurred during the configuration of the host.

  I hope that there is a log file I can verify for a more profound description of this lame error message.

  Can someone tell me where I can check on this error?

  Thank you

  Oh. k. so, it is the function of Read Cache (vFRC) Flash of vSphere and nothing to do with VSAN

  check the diaries which is throwing this error.

  ESP: /var/log/hostd.log and log/var/log/vmkernel of corresponding calendar. This will show what is happening here

  You can check the following

  one.

  Check if SSD LUNS are not used / no other partition

  # partedUtil getptbl/vmfs/devices/drives.

  b.

  Also check that the SSD lun on that host are local and eligible for the vflash

  List of devices # esxcli storage vflash

  Thank you

• vpshere edition to use Flash Cache reading

  Hi all...

  Reading the information on this new feature of version 5.5, it seems very interesting, but comes standard on the Standard and Enterprise versions? ..... I say this because in the vmware site Web, in editions of comparison chart, appears as the "point" in the plu company...

  A welcome message...

  Welcome to the community,

  I can't tell you what the future will bring, but from now on, read Cache Flash unfortunately is only available with the Enterprise Plus license.

  André