Thursday, 7 June 2012
It's a RAID - Call for rapid RAID recovery response
Wednesday, 3 August 2011
Raid 1 + 0 - can fail too
Raid 10
You have a failed Raid 10 : Make Sure all drives are numbered and clearly marked
RAID 10 is implemented as a striped array whose segments are RAID 1 arrays
RAID 10 has the same fault tolerance as RAID level 1
RAID 10 has the same overhead for fault-tolerance as mirroring alone
High I/O rates are achieved by striping RAID 1 segments
Under certain circumstances, RAID 10 array can sustain multiple
simultaneous drive failures
Excellent solution for sites that would have otherwise gone with RAID 1
but need some additional performance boost
But did you know:
All drives must move in parallel to proper track lowering sustained
performance
Very limited scalability at a very high inherent cos
*Questions for the reader:
How many drives have failed? are they logical, electrical or physical
failures. Are the drives a matched set. Do you know if the failure of
the two drives was at the same time or has one drive failed and the
second went out at a later date?
Keep the order of the drives - number them before removing any drives.
Has the Raid been reinitialised? - if not DO NOT allow a reinitialisation
Are you able to supply the Raid controller?
Capacity of the drives (how many GB for each drive)
What type of drives (IDE ,SCSI, SATA)
Block Size used? (offset of starting block)
Details - additional RAID information
Friday, 22 July 2011
5 Essential Tips For Your RAID5
5 Essential Tips For Your RAID5
As the cost of drives become cheaper, and capacity is expanded, it is not surprising to find the popularity of RAID5 systems increasing.
However, like any other computer component, they are subject to failure.
Follow these essential tips to ensure you keep your RAID running smoothly, and your data intact.
1 - Backup Regularly
RAID5 is not a substitute for regular proven backups.
RAID5 cannot prevent problems occurring from deleted or overwritten files, formatted partitions, file structure damage, virus activity or user error.
RAID5 is designed to be hardware fault tolerant, not software fault tolerant.
Restoring from your backups is sometimes the only method of recovering from logical data problems.
Also, do not backup from your RAID5 to another file, directory or partition on your RAID5 - if your entire RAID5 fails over, so does your entire data set.
2 - Maintain Drive Comfort
Multiple drives all spinning concurrently can generate a lot of heat.
Be liberal with your cooling methods, a single fan is the absolute minimum, better to have a fan blowing through the spacing between the drives, and a second fan helping to exhaust the warm air.
Also be diligent in dusting out your enclosure as computer fans have a nasty habit of bringing any outside dust inside the case where it can settle on components, raise temperatures and cause electrical damage.
3 - Monitor RAID Status
Most major software RAID programs and hardware RAID card manufacturers can create logs detailing all sorts of useful information on your RAID.
Ranging from performance values to outright failure notification, it is wise to use these logs to your advantage
For example, they can inform you that a drive has been dropped from the array perhaps through a bad data cable and is no longer detecting.
Without any warning you may not notice this failure since your RAID will simply continue running in degraded mode until the problem is repaired.
Extra tip: Setup a periodic, automatic email of the log files to your email account to ensure that you are on top of any problems that may arise during the day to day running of the system.
4 - Keep A Spare Identical Drive
It is only a matter of time before a drive in your RAID5 starts to degenerate with read errors, or fails entirely due to motor failure or the click of death.
Thanks to RAID5 reliability you can counter this by replacing the failed drive without too much effort.
Before, you simply power down and replace the drive (or hotswap) ensure your backups are in working order, because Murphy is currently eyeing your RAID which now has zero tolerancy for failure.
Replacing the drive with the exact same model will ensure the same performance from your RAID as before the failure occurred.
Secondly, if your RAID does happen to sustain a multiple drive failure from which you cannot recover, a power surge comes immediately to mind, having a spare drive readily available for parts for a specialist data recovery laboratory may save you time and money.
5 - Label Your Drives
When it does come time to replace a drive in your array, it pays to know the exact one you should be replacing.
More often than not further problems are caused by accidently replacing an incorrect drive, which can 'confuse' many controllers - even after drive order is returned.
Do yourself a favour and label the drives as they are marked in the controller card or software configuration you use.
http://www.sydneydatarecovery.com.au/raid-recovery.html
Tuesday, 12 July 2011
Raid 0 – failed? needing answers!
Raid 0 – failed needing answers call or online
http://australiadatarecovery.com.au/raid-0-data-recovery/
You have a failed Raid 0 :
You set it up for speed- RAID 0 implements a striped disk array, the data is broken down into blocks and each block is written to a separate disk drive,
Raid 0 - I/O performance is greatly improved by spreading the I/O load across many channels and drives
Raid 0 -Best performance is achieved when data is striped across multiple controllers with only one drive per controller
Raid 0 -Very simple design and was easy to implement
all this you may know but did you read the Small print for your Raid 0 -:
* The failure of just one drive will result in all data in an array being lost*
* Should never be used in mission critical environments
*Questions for you:
If there is 1 failed drive is it a logical failure or a physical failure. Any unsual noises remove the power immediately and completely.
Are the 2 hard drives a matched set - this can sometimes help in the speed of turn around as parts can be utilized from the good drive to bring the failed drive up to spec.
Or at the very least in a state that data can be mirrored.
The lab will require both hard drives sent in and can do a lab evaluation and quote same day of its arrival.
The quote will let you know the firm quote and time required to get your data back to you.
Thursday, 18 October 2007
Channeling the right service partner
Channeling the right service partner
The data recovery market and what resellers need to know about this market – responses to CRN’s questions from Vicky Brauner, Managing Director, CBL Data Recovery
What is the best approach for resellers taking on data recovery for the first time?
First of all, let me say that data loss is pretty much inevitable. Regardless of whether it’s a stolen laptop containing vital emails, or the faulty backup that means data is gone when disaster strikes, chances are that data loss will affect most of your customers in their working lives.
Reselling a data recovery service gives you the opportunity to swoop in and save the day. It’s a brilliant way to cement loyalty – if you are sure the service you’re offering is truly the best in its class and will, in most cases, restore some or all of their data. So in my view, the best approach for resellers is to jump into the market with both feet, having first made sure that you’re working with a quality provider.
What types of data recovery organisations do resellers need to look out for?
There are a number of questions you can ask to work out a service provider’s capabilities – the first of which is to ask their success rate.
At CBL, we stake our life on our success rate, by offering a “no recovery – no charge” service which means we only get paid when we succeed in recovering data.
We recommend resellers also check on a provider’s expertise. For instance, I would always ask “do you work on my original drive?” and be prepared to back away quickly if the answer is “yes”.
Working on original drives is a huge mistake because, if things go wrong – and let’s not forget here that we’re piecing together bits and bytes – the damage is irreversible.
Another issue that’s important to resellers is geographic reach. One of CBL’s resellers,
Scott Jones, General Manager of IT Leaders which provides IT products and services to over 500 clients in NSW and QLD, says having a local Australian supplier on board gives clients peace of mind that their hard drives are not being shipped overseas and also makes it easier for them to deliver their affected media within 24 hours.
A final differentiator between data recovery services providers is their commitment to customer service.
Resellers, of course, know that customer service is a life or death issue, and so we weren’t surprised when a company of the calibre of IT Leaders was hesitant to let us speak directly to customers in the early days of our relationship.
However, I’m happy to say that, having established CBL’s commitment to service, Scott is now happy to let us deal direct with his customers – keeping him in the loop - so as to save time during the recovery process.
What kind of rewards and incentives work well for resellers in today’s marketplace?
Different providers vary in their commissions back to resellers – CBL provides a flat 20 percent – while some providers lure resellers by focusing on rewards programs with significant cash and overseas holidays. The decision for resellers, of course, is weighing the reward or commission against the ease of dealing with the data recovery services provider as well as how likely their customer is to value the outcome of the project.
Most importantly, what types of resellers suit the data recovery market?
Data recovery is a service that fits naturally with any reseller operation involving hardware with storage media – from digital cameras through to 2TB Raid servers.
The most important thing to remember is that, when carried out by a quality provider, data recovery services can provide you an additional source of revenue and, if it helps you alleviate their pain when data gets lost, can cement their loyalty to you. If that’s the type of business offering you’d like, then data recovery is a service you just might be fond of.
About CBL Data Recovery Technologies Pty Ltd.
Since its establishment of operations in
Wednesday, 10 October 2007
Whatever the cause of your Raid hardware failure and data loss
Whatever the cause of your Raid hardware failure and data loss, this is what you should do right now:
· Do not panic
· Never replace a failed drive with a drive that was part of a previous RAID system - always zero out the replacement drive before using
· If a drive is making unusual mechanical noises, turn it off immediately and get assistance
· Have a valid backup before making hardware or software changes
· Label the drives with their position in a RAID array
· Do not run volume repair utilities on suspected bad drives
· Do not run defragmenter utilities on suspected bad drives
· Do not attempt to repair the failed device
· Contact a Sydney Data Recovery expert at 1-800-287-225.
Data loss can cripple an organization but in most cases, the data can be retrieved.
REDUCE RECOVERY TIMES FOR RAID FAILURES
SYDNEY DATA RECOVERY
DEVELOPS INNOVATIVE SOFTWARE TO REDUCE
RECOVERY TIMES FOR RAID FAILURES
St. Leonards, NSW – Sydney Data Recovery (SDR) ( www.sydneydatarecovery.com.au ), a leading Australian provider of computer data recovery services, has announced the deployment of a new software utility that radically reduces the time it takes to recover data from crashed multiple disk RAID arrays and other Enterprise Storage Systems such as SAN’s and NAS’s.
The proprietary software, used in conjunction with SDR’s RAID Response Service, revolutionizes data recovery for multi-disk storage units. This means minimal disruption to business while the data recovery efforts are underway. In addition, the RAID software allows SDR to reduce recovery times to hours instead of days or weeks over current recovery processes in use in the industry.
“Systems managers put a lot of faith in RAID, but they fail just like any other type of technology,” says SDR’s head of research and development. “To recover data from a six-disk RAID array can take experts days. By automating many of the laborious tasks, we can now reduce this time to only a few hours.”
The technology has been designed to work with any RAID vendor or combination of controllers, scheme or encoding system. Developed by a at CBL Data Recovery Technologies (CBL) labs in the Center for Advanced Industry in Newcastle, UK, is part of an ongoing strategy to create innovative tools to reduce the costs and response time of data recovery from any media or operating system.
“Many data recovery firms simply avoid complex jobs like recovering RAID because the store bought tools simply don’t exist for RAID,” adds Fitzpatrick. “To manually configure a system to help recovery traditionally requires a high degree of technical knowledge and is very time consuming.”
This year marks CBL’s 15th year of successfully offering data recovery services to clients with damaged storage media due to hardware failure, virus activity, system malfunctions, physical damage, file corruption or human error. The new technology has already been successfully used within CBL’s worldwide network of 16 labs in five continents and is now available as part of SDR’s RAID Response Service.