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Hard Drive Array Issues


During the synchronization the output will look like this: server1:~#cat/proc/mdstatPersonalities:[linear][multipath][raid0][raid1][raid5][raid4][raid6][raid10]md0:activeraid1sda1[0]sdb1[1]24418688blocks[2/1][U_][=>...................]recovery=9.9%(2423168/24418688)finish=2.8minspeed=127535K/sec md1:activeraid1sda2[0]sdb2[1]24418688blocks[2/1][U_][=>...................]recovery=6.4%(1572096/24418688)finish=1.9minspeed=196512K/sec unuseddevices: When the synchronization is finished, the output will look like this: server1:~#cat/proc/mdstatPersonalities:[linear][multipath][raid0][raid1][raid5][raid4][raid6][raid10]md0:activeraid1sda1[0]sdb1[1]24418688blocks[2/2][UU] md1:activeraid1sda2[0]sdb2[1]24418688blocks[2/2][UU] unuseddevices: That's it, you have successfully Hardware & Devices Our Sites Site Links About Us Find Us Vista Forums Eight Forums Ten Forums Help Me Bake Network Status Contact Us Legal Privacy and cookies Windows 7 Forums This may not work.If you can leave the non-failed arrays running, and if you have a hot swap setup, you may be able to get away with pulling drives until you Pulling the wrong one with a degraded array will probably cause your computer to lock up.If you can shut down your computer, you can disconnect the SATA cables one by one http://lacosteradigital.com/hard-drive/2nd-hard-drive.html

I'm wondering if time machine does this when it runs out of space, or if it's a maintenance thing, but I'm terrified it would start doing this when I really need Resetting to NON-RAID Reset the RAID Disks to NON-RAID Note: When performing this operation, all data on the RAID drives is lost. I assume it was rebuilding the Array due to some form of data corruption from suddenly loosing power or something. The drive is also plugged into its own surge protector. https://www.examcollection.com/certification-training/a-plus-how-to-troubleshoot-hard-drives-and-raid-arrays-and-troubleshooting-tools.html

Dell Desktop With Raid 1

If one of the 3 TB drive crash, you will still have your data on the other one. But there are a lot of good programs out there. Whenever you can afford to run a hot spare in your storage, indulge yourself - do so, and you will be sleeping better at night! A dumb raid which is pretty much all hardware raid and also a big chuck of software raid solutions doesnt know which data is correct or wrong, it has to guess

Thanks! RAID for your applications (which I also have setup) was really a bit of a desappointment to me. Here is my reasoning….OptionA: RAID 5 without hot-spare (3 drives in total) OptionB: RAID 5 with a hot-spare (4 drives in total)In OptionA: if one drive fails, you simply replace that Asus Motherboard Raid I also found out that Time Machine has issues with backing up huge files and often stops the restore process when the size of files are too big.

No, it’s actually over 800 years which highlights the difference between lifetime and MTBF. As drive sizes increase the impact of losing a drive becomes greater and as we all know SATA drives have lower duty cycles than Fiber or SCSI drives and are more Any advice on a /dev/sda master mirror disk failure? http://www.dell.com/support/article/SLN155075/en You mention 4 other possible causes for data-loss in your article but I am afraid I have to admit that I have never EVER lost data that way.

Posted on 2016-01-14 21:56:08 Parrish Agreed. Motherboard Raid 5 Thanks again!

From: Paul Bruner Reply I think the auther needs to put in how to find the physical drive though. First we mark /dev/sdb1 as failed: mdadm --manage /dev/md0 --fail /dev/sdb1 The output of cat /proc/mdstat should look like this: server1:~#cat/proc/mdstatPersonalities:[linear][multipath][raid0][raid1][raid5][raid4][raid6][raid10]md0:activeraid1sda1[0]sdb1[2](F)24418688blocks[2/1][U_] md1:activeraid1sda2[0]sdb2[1]24418688blocks[2/2][UU] unuseddevices: Then we remove /dev/sdb1 from /dev/md0: mdadm --manage If you have a hot spare, the NAS will start an automatic rebuild, at the end of which you have a restored 3 drive setup.

Raid 1 Hard Drive Replacement

AND even though you can recover from a crash, you should talk to people that have had to do so, IT CAN BE PAINFULLY SLOW to rebuild the failed drive. Posted on 2008-05-15 09:27:14 BobH I have my Vista on a RAID 0 setup, but I don't see a huge performance boost over using a single drive, especially in every day Dell Desktop With Raid 1 Thanks again. Raid Support Motherboard See Resetting the Enclosure Hardware.

Off – Link is lost. http://lacosteradigital.com/hard-drive/where-is-my-25gigs-of-hard-drive-ahh.html If disaster were to strike, I could still export the images again from the backed up Lightroom archive. If we're looking at the chances of a degraded array, then addition of failure rates is appropriate. I have lost count of the number of times that a hot spare has saved the day…I have worked on one customer's system where the transactional traffic was so high that Motherboard With Raid Controller

From: Anonymous Reply Many Thanks Works exactly to the point!

From: Taurus II Reply This was a great help but, I got an error whilst trying to copy Hope that helps From: Kris Reply This is a great guide but unfortunately, I could not apply it to my failed Raid-1situation. that's what the industry in fact currently recommends as it reduces both RPO and RTO and help you have your data available almost every time. http://lacosteradigital.com/hard-drive/raw-hard-drive-help.html At at a time when nearly every modern motherboard has built in RAID, they have to offer it just to be considered as feature rich as their competitors.

Try to pinpoint the time when problems began to appear. Non Raid Disk Repair No, then please go to the guide below : Understanding and Troubleshooting your Hard Drive Are you getting an error before the RAID screen loads? I do tons of HD video editing on my MacBook Pro and have almost filled all THREE of my external 5TB USB 3.0 drives (yes, 15TB is a lot!).

it will reappear if i restart my system.

Cutting edge workstations. For step-by-step procedures, refer to the Sun Storage J4500 Array Service Manual (820-3160). As the author here write, if you delete one file, you delete them both - this is true also of some backup schemes, though also. How Many Pins Are In An Sata Data Connector ALWAYS backup your data.VA:F [1.9.22_1171]Rating: +18 (from 18 votes) ReplyYowser January 19, 01 2016 10:12:36Silly not to have a hot spare if you can.

Those are the only two real justifications for raid. What happens if your 3 tb drive crashes? Yes, a raid1 main drive is not good idea for data preservation. check over here Some or all of these features are available through supported management software (for example, the Sun Common Array Manager (CAM), or the Sun StorageTek RAID Manager software) to provide a system

Many thanks for any enlightenment! 😉 Chris Reply Pete Marovich says: February 21, 2016 at 3:43 pm The Raid 5 should be considered at one big drive as far a backup The concept of a RAID is to combine multiple, less-expensive drives into a single, higher-capacity and/or faster volume. Anything that increases the risk of data loss is a bad idea.Based on our long years of experience we have learned that during a RAID rebuild the probability of an additional This means it's worth keeping a close eye on all your disk drives to spot which models are unreliable.

run 'grub' 6. Does it? I completely agree with you, but would like to point out that you are making it sound as if 'RAID' itself is flawed while you should be saying 'on-board software RAID' Thanks in advance!

So while it's true that it could be an issue, a degraded array does not necessarily equate to a dead disk as such. For example, block A is on drive 1, block B is on drive 2), and this permits increased write and read speeds. You're right that looking at MTBF is another way of approaching it, but it is just another way of saying the same thing. The computer hardware also functions in the same way.

Not having a hot spare on a raid system composed of 15/20 disks means that potentially you're using a RAID 0 once a drive has failed and the more disks you At that point, you are relying on the RAID controller for error correction and array management, and the fact of the matter is that all (yes, all) RAID controllers onboard a