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    • Oksana

      Breakthrough in RAID Technology and Backups: What is GRAID?
      Starwind • starwind starwind backup appliance backup ssd raid graid nvme • • Oksana

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    • Oksana

      Worldโ€™s Coolest, Newest, and Fastest RAID โ€” GRAID
      Starwind • starwind backup starwind backup appliance nvme nvme-of graid raid • • Oksana

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    • DustinB3403

      Goodbye hardware monitoring on HPE Gen10 and newer equipment running ESXi
      IT Discussion • hpe raid monitoring esxi gen10 servers • • DustinB3403

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      Dashrender

      @dbeato said in Goodbye hardware monitoring on HPE Gen10 and newer equipment running ESXi:

      @dashrender However centrally managed doesn't mean site to site VPN. I don't get MSP that have site to site VPNs to their customers. It is not feasible to maintain, it is a high risk and very old school.

      of course it doesn't.

      using a tool like ScreenConnect - having all customer machines in a single account - means SC's hacked, then ever client is hacked...

    • Pete.S

      Blind swap / automatic rebuild on software RAID
      IT Discussion • raid raid rebuild mdadm • • Pete.S

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      Pete.S

      @Pete-S said in Blind swap / automatic rebuild on linux:

      @DustinB3403 said in Blind swap / automatic rebuild on linux:

      @Pete-S said in Blind swap / automatic rebuild on linux:

      @travisdh1 said in Blind swap / automatic rebuild on linux:

      @Pete-S said in Blind swap / automatic rebuild on linux:

      @travisdh1 said in Blind swap / automatic rebuild on linux:

      @Pete-S said in Blind swap / automatic rebuild on linux:

      I often see that the argument for using hardware raid is to be able to initiate an automatic rebuild by just swapping a faulty drive for a new one.
      A lot of people assume that software raid can't do that. But that's incorrect.

      Software raid on linux (as in md managed by mdadm) can do the exact the same thing.

      It's under policy and partition policy in mdadm.conf. You'll find on the man mdadm.conf page.
      The spare-same-slot option would be the one that works the same way as hardware controllers usually do.

      I haven't used it myself since I prefer to initiate the rebuild myself. But I wonder if you guys have used it?

      I don't think blind swap is about automatic rebuild, that's a given no matter what software/hardware RAID is running. It's more about seeing the light is red instead of green on drive 6, so you know that is the one to replace.

      The only example of not having that available, that I can think of, is https://www.45drives.com/

      I don't know man.
      A typical SMB would have no monitoring and any server would be stuck in a closet somewhere. Nobody would notice any red lights until several months later or until something breaks and then they'd have no clue what to do about it, wouldn't know who to call and wouldn't have any idea if the server even has warranty (it never has). A spare drive wouldn't be available unless it was an old discarded drive left on the shelf from the last time something was replaced.

      While probably true, that doesn't really have anything to do with blind swap.

      I'm just saying those that have their server park under control doesn't really need any LEDs. And those that really needs it, doesn't look at it.

      But it would actually be a small thing to make a script that would indicate faulty drives. You look at /proc/mdstat and any drive showing a _ instead of U is lit up on the drive bay. It's controlled by SGPIO or SES. That's how the raid controller does it.

      I thought MD was already capable of performing this. . .

      I don't think so but I could be wrong.

      I mean you could run raid 1 on a pair of sd cards. Since that md works on any type of block device or partition there is no guarantee that there are any drive bay lights or anything of that nature. But it's possible that there is an option for it.

      Has a quick look and it looks like the ledmon package monitors md arrays and set LEDs accordingly.
      So yes, software raid can indicate what drive has an error directly on the chassis with some additional software.

    • DustinB3403

      Intel Chipset SATA RAID Controller
      IT Discussion • windows raid uptime downtime power outage failure status health controller details • • DustinB3403

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      DustinB3403

      I just confirmed, this system is only using the Intel controller, and not SS.

    • zachary715

      RAID5 SSD Performance Expectations
      IT Discussion • raid raid 10 performance ssd ssd raid5 • • zachary715

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      Obsolesce

      This is how drive testing is such a deep topic. You need to try and match the load, and consider all the things. CrystalDisk does not do that.

      You can set up some really good tests with iometer. (I think that's waht it's called, i can't remember now it's been a long time and can't look it up atm)

    • Pete.S

      RAID rebuild times 16TB drive
      IT Discussion • raid rebuild raid hdd md raid • • Pete.S

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      scottalanmiller

      @StorageNinja said in RAID rebuild times 16TB drive:

      @scottalanmiller said in RAID rebuild times 16TB drive:

      Its a system, not an IO, bottleneck typically. Especially with RAID 6. Its math that runs on a single thread.

      Distributed storage systems with per object raid FTW here. If I have every VMDK running it's own rebuild process (vSAN) or every individual LUN/CPG (how Compellent or 3PAR do it) then a given drive failing is a giant party across all of the drives in the cluster/system. (Also how the fancy erasure code array systems run this).

      Yeah, that's RAIN and that basically solves everything ๐Ÿ™‚

    • Oksana

      Get Insight into ZFS Benefits for Your Infrastructure
      Starwind • zfs raid raidz deduplication snapshots • • Oksana

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      C

      @Obsolesce You can watch it on Starwind YouTube channel.

    • scottalanmiller

      How to Stop an Ongoing RAID Rebuild HP P420i RAID Controller
      IT Discussion • raid hpe p420 raid controller • • scottalanmiller

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      scottalanmiller

      @WrCombs said in How to Stop an Ongoing RAID Rebuild HP P420i RAID Controller:

      we use Intel Rapid Storage - CTL +I on Boot gets you there? - Disclaimer I may be thinking of Software RAID rather than Hardware RAID - but It may be worth a shot to try..

      Yeah, Intel Rapid Storage is the most prominent example of Fake RAID. So it is software.

    • CCWTech

      Server with multiple backplane / Drive Configuration
      IT Discussion • server configuration backplane raid • • CCWTech

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      CCWTech

      @Pete-S said in Server with multiple backplane / Drive Configuration:

      @CCWTech said in Server with multiple backplane / Drive Configuration:

      @Pete-S said in Server with multiple backplane / Drive Configuration:

      @CCWTech said in Server with multiple backplane / Drive Configuration:

      @Pete-S said in Server with multiple backplane / Drive Configuration:

      What server/model is it?

      HP ML350 Gen 10

      https://techlibrary.hpe.com/docs/iss/ML350_Gen10/setup_install/

      OK, looks like there are many storage options on that machine and many different raid controller options as well.

      But, there are no SAS expanders on the backplanes. Backplanes are straight "dumb" wiring so to speak. HPE has an additional SAS expander card that have to be installed if you're using that.

      So if you have 16 drive bays I assume 8x2.5" drive bays per "box". You then probably have it paired with the P816i-a controller in which case you have each drive bay directly wired to one SAS port from the controller.

      So it makes no performance difference how you install the drives. I would however put the SSDs in one box (one backplane) and the HDDs in the other - just to make it less confusing and less of chance to pull the wrong drive when something fails.

      I don't understand why you would use 2.5" HDDs at all though but that is another matter. The server can also be configured with one 8x2.5" and one 4x3.5" bay which would be my preference.

      Yes, it is the HP SAS expander card I'm using.

      Since the backplanes in that server doesn't do anything, it makes no difference in what bays you put the drives. Not from a performance perspective and not from a redundancy perspective.

      From the SAS expander to the backplane to the drive is electrically the same as just having a straight cable. So there is nothing that can fail - unless you physically abuse it.

      The backplane does have some electronic components on it though but that is for driving the LEDs in the drive bays.

      Awesome thank you everyone!

    • S

      Deciding Between Hardware and Software RAID in My FreeNAS Deployment
      IT Discussion • zfs freenas freebsd storage hardware raid software raid raid • • saniplastic

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      S

      @matteo-nunziati said in Deciding Between Hardware and Software RAID in My FreeNAS Deployment:

      @saniplastic said in Deciding Between Hardware and Software RAID in My FreeNAS Deployment:

      @DustinB3403 said in Deciding Between Hardware and Software RAID in My FreeNAS Deployment:

      metadata

      metadata?

      please explain more.

      The config files where the vm is defined. Do not backup the vm disk only. I suppose he referes to this.

      I backup with veeam.
      whole vm files.

    • scottalanmiller

      UNIX: ZFS
      IT Discussion • unix linux solaris bsd freebsd sam linux administration file system storage zfs raid lvm logical volume managers software raid • • scottalanmiller

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      scottalanmiller

      Placeholder

    • scottalanmiller

      What is ZRAID and Is It Related to ZFS
      IT Discussion • raidz raid zfs xraid • • scottalanmiller

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    • steve

      RAID - CompTIA A+ 220-1001 Prof Messer
      IT Careers • raid storage prof messer comptia a+ youtube video training certification it career it training • • steve

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      brianwinkelmann

      Interesting but also I get confused with all the comments XD

    • scottalanmiller

      An Overview of RAID - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer
      IT Careers • storage raid prof messer youtube a+ comptia it training • • scottalanmiller

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      scottalanmiller

      @connorsoliver said in An Overview of RAID - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

      Is using a RAID 1 configuration faster as well? Or is its main purpose so if you lose one of the drives you have a backup?

      Primary purpose is definitely data protection. But RAID 1 provides a 200% read performance benefit over using a single drive. Write performance is the same as a single drive.

    • J

      Raid10, must use or another Raid limits?
      IT Discussion • raid raid 6 raid 10 • • Jimmy9008

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      scottalanmiller

      @PhlipElder said in Raid10, must use or another Raid limits?:

      Modern RAID controllers have the horsepower and cache RAM that is flash backed to overcome any real parity performance costs.

      Operationally it would be just fine. It's only recovery time that would be of concern.

    • J

      Dell MD1220 RAID 5 Rebuild Question
      IT Discussion • das san storage dell dell md1220 raid raid resilver raid rebuild raid recovery raid 5 • • Jimmy9008

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      J

      @scottalanmiller said in Dell MD1220 RAID 5 Rebuild Question:

      @Jimmy9008 said in Dell MD1220 RAID 5 Rebuild Question:

      @scottalanmiller said in Dell MD1220 RAID 5 Rebuild Question:

      @travisdh1 said in Dell MD1220 RAID 5 Rebuild Question:

      That makes a little more sense. They've negotiated a deal with Microsoft from the sounds of it.

      No, way, way more likely they just figured out how hard it is to get caught.

      I totally doubt anything like that is going on here. I have been told our annual budget for licensing which we pay is in the region of ยฃ600,000. Either way, not my problem ๐Ÿ™‚

      Wow. But, sounds like only that high because they don't know what they are using, lol. The only way to get licensing truly down is to know what you use. Someone is both ignoring what is used, but also encouraging unlimited use. Both things set MS up to just keep making it more and more expensive. It's a trick, sounds easy, but makes one lazy licensing person encourage not keeping licensing lean - basically giving Microsoft the power to charge anything that they want down the road.

      Yeah, not your problem, but definitely a symptom of management issues and a lack of clear thinking. If they are truly paying their bills, my guess is a licensing "specialist" who has created their own job and knows if MS isn't used heavily, their job would go away, so is doing stuff to encourage you to lock in MS so that that specialist can't be eliminated. Basically creating their own job.

      Yeah, I don't disagree with anything you said. It's just not my issue. I still get to buy shiny new toys ๐Ÿ™‚

    • Emad R

      Unsolved Linux NFS SSD caching
      IT Discussion • nfs cache raid file server storage • • Emad R

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      Emad R

      @Emad-R said in Linux NFS SSD caching:

      AID 10 on Linux File Server machine, how can I speed up this NFS storage by an intelligent
      cache, for example I wish to add another 250 GB SSD to act as cache, how will tha

      Yeah the RAID 10 is on HDD, due to cost effectiveness. Will check LVM since its baked in.

    • DustinB3403

      Hyper-V Server 2016 - How should someone add 18.5 TB of storage
      IT Discussion • hyper-v 2016 raid sata • • DustinB3403

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      StuartJordan

      Oh dear.....{sigh..}

    • Donahue

      Battery Backup with SSD raid
      SAM-SD • raid ssd storage • • Donahue

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      Pete.S

      @scottalanmiller said in Battery Backup with SSD raid:

      @pete-s said in Battery Backup with SSD raid:

      @scottalanmiller said in Battery Backup with SSD raid:

      @pete-s said in Battery Backup with SSD raid:

      @scottalanmiller said in Battery Backup with SSD raid:

      SSD NV protection is to allow the SSD's cache to flush safely should power be lost. RAID NV / battery protection is to allow the RAID's cache to flush safely should power be lost. Each is important on its own, neither covers for the other one.

      That's technically slightly incorrect.

      The non-volatile cache memory on the raid controller is to be preserve the data that has not yet been written to the drives, until power is restored again.

      On the SSD the capacitors hold enough charge so that the drive can write the remaining data in the cache memory to the actual flash memory after the power is gone. The cache is DRAM so it will loose it's contents after a few seconds.

      The only time details like this matter is if you remove the battery from a raid card, your data might be lost.

      I'm missing how that is different than what I said. What you said is correct, but I feel like you just reworded what I said, with the added detail that the RAID card flush is not until power is restored, which one hopes is obvious.

      Sorry Scott, you're right. I was just thrown off by you said "SSD NV protection" and because you worded both thing the same. Obviously both things are to protect from data loss at power failures.

      OIC, you are saying that the SSD is volatile, but has a battery in most cases? makes sense.

      Almost, let me explain. Below is a picture of an Samsung enterprise SSD, SM863.

      The SSD controller (yellow) is the brain. The flash memory (green cross) is non-volatile so it will not suffer data loss without power. There are also more flash memory on the backside.

      The cache memory however is the blue ring and it will lose it's memory as soon as the power is removed. It's the same type as the memory in your computer, DRAM. That would cause immediate data loss and that is not good and that is why enterprise drives have a lot of capacitors (red circles).

      The capacitors (red) act like small rechargeable batteries. When the drive loses it's external power these small capacitors will work as a reserve power for the entire drive. The controller (yellow) knows that it has lost external power so it will quickly write the data from the cache memory (blue) to the flash memory (green) before the reserve power from the capacitors (red) are empty. That way data loss is prevented. This will only take a couple of seconds at most.

      0_1538765396271_samsung_ssd.png