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13

We don't proactively replace disks. Wait until they fail or report prefailure status. This is why you have (hardware) RAID, management agents, failure indication LEDs on the server and a monitoring solution. Keeping your gear under warranty and maintain your support contracts (within reason), having cold spares of components that fail often (disks, power ...


4

You've encountered the "Ready for Rebuild" error. This likely indicates that the drive can't finish its rebuild because the disk you replaced is having trouble reading from its partner drive. Essentially this means that you may have a failed disk and a failing disk. I'm curious as to how you discovered the drive failure? Did you receive an alert? A ...


4

The Samsung SM843T is a very nice looking SSD. The key points you want to look at in an SSD datasheet are the figures talking about drive longevity, which may be expressed as device writes per day or TB written. The SM843T datasheet has both, and more usefully has the figure for both random and sequential workloads. A random workload means 100% random 4K ...


4

I have not seen such high numbers or SSD failure rates on MacBooks in my organizations... Things to consider: Typically the SSD failures will be a result of wear out from write activity. Check to see if there are any processes/programs common to the laptops that may cause more wear than normal. Use a tool like SMARTReporter to track S.M.A.R.T. diagnostics ...


3

Run a regular script (cron) that checks zpool status -x output. Longer-term, the ZFS on Linux project is working towards this in the form of an event daemon. The Solaris-derived systems had access to the Fault Management Architecture. As far as automated reports, even commercial solutions like NexentaStor use scheduled checks. There's nothing wrong with ...


3

Try zfswatcher, it works really well for me.


2

Certainly you can shorten an SSD's lifetime by using heavy writes but this has come on enormously in the last few years to a point where it's perfectly acceptable to write multiple petabytes over the course of a single SSD's life - so long as you pick the right product. You don't mention which OS you're planning on using but Samsung has a Windows utility ...


2

We don't proactively replace disks either. Backblaze recently did a blog post on this subject. One should note that they primarily use consumer grade drives.


2

"Completed without error" The list mentioning prefail shows the types of errors that are possible with their thresholds. None of your worst values are past the thresholds. Get 2 disks, use RAID1 or get 4 disks and use RAID10. RAID4 is not used.


1

The photo looks like your system is an HP ProLiant DL360 G6 or G7 1U rackmount server. I saw your note about defective HP disks. I work with a considerable number of HP servers and haven't seen this as a widespread problem. I do think that you could provide more information about the Smart Array RAID controller's status during the system's POST process. ...


1

Welcome to serverfault! Based on the information you supplied in your "answer" post (you should edit your question to supply extra information, not post an answer): Oh dear. Looks like you had a failed disk, and then the array ejected another disk for whatever reason - given that the outcome of whatever happened was fatal, it either ejected one of the ...


1

Q1: The order of [U] vs [U]. Why aren't they consistent along all the array? Is the first U /dev/sda or /dev/sdb? The order is based on the RaidDevice numbers. These are the numbers in the square brackets of the lines like this: md3 : active raid1 sdb4[2](S) sda4[0] 478713792 blocks [2/1] [U_] md2 : active raid1 sdb3[1] sda3[2](F) ...


1

Last time you had the old disks to get the data. If you do not have the old disk that failed, you are literally missing half of your data. You will not be able to recover this data. You can try to send both the disks offiste to a data recovery company if your data is important enough. Even if you have access to the old disks, if you can't mount it, you cant ...



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