## Windows Server 2016 – SAS disks are not recognized in Netapp DS4486

To get started, here are the relevant hardware specifications:

• Dell R710 with Windows Server 2016
• Dell PERC H200e
• Dell PERC H810
• Dell PowerVault MD1200 with 03DJRJ controllers
• NetApp DS4486 with IOM6 controllers

I have a total of 26 SAS drives. These are all 4TB Seagate ST4000NM0023 drives, 3TB Seagate ST33000650SS drives or 600GB Seagate ST3600002SS drives. I have tried them in several configurations in the DS4486: one drive per sled (both positions), two drives by sled, a mixture of each type in a sled, and all these configurations in several different bays of the enclosure. with unrecognized discs. If I take exactly the same drive and put it in a Dell MD1200, they are recognized and accessible by the operating system without any problem. I connected the DS4486 and the MD1200 to a PERC H200e and a PERC H810 and the results are the same. I even tried to chain the daisy chain boxes as follows: host -> MD1200 -> DS4486. The results are always the same, not all discs are recognized in the DS4486.

The drives appear in Disk Management as uninitialized drives. Drive properties indicate the correct model number of the drive. The size of the reader properties is 0 bytes. If I try to initialize the player as GPT, I get an error stating that the size is not large enough. If I choose MBR, I get an I / O error. When I run diskpart -> list disk, the output seems to freeze a bit, then the drives are displayed in the list about 30% of the time, otherwise the list is empty. If I try to use select disk <##> (using the disk management disk number), then execute any other command such as clean or online disk I get an error message in the output.

Any ideas on what to try next? If more information is needed, let me know, I will provide you with everything I can.

## amazon web services – How do I determine the cause of slow I / O speeds in Windows on my EBS provisioned io1 disks in AWS?

In AWS, I have a server running Windows Server 2016 Datacenter. There are two EBS io1 disks provisioned on this server. They are provisioned up to 9,600 IOPS. The E: drive is 2.24 TB wide and is the GPT partitioning style, while the D: drive is 1.99 TB wide and is the MBR partitioning style.

I'm trying to move around 1.7 TB of data (mostly a few large SQL Server database files) from drive D: to drive E: and the write speeds I see in the transfer of Windows files experienced a short burst of around 120MB / s but averaged 30MB / s. The IOPS I see writing to the E: drive was on average about 200 IOPS, but is now much lower.

How can I debug the bottleneck behind my local file transfer speeds between the two drives? (Note: I have never seen writing IOPS over 200 on drive E: even if it is provisioned for 9,600 IOPS.)

## performance – Storage of data files on separate physical disks

Does storing SQL server data files for 1 database in different drives improve performance? Is it recommended to do it? Benefits of dividing data files into multiple physical disks? There are no partition tables. The db is oltp which is intensive in reading and writing.

Sample database

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## linux – How to read 3Ware disks without the controller?

I have an old 3Ware 9650SE which does not work with my current motherboard. It is recognized, but gets tons of CRC errors every time Linux tries to do something other than ask what kind of card it is.

I have a bunch of disks that contain old file systems that were connected to this card.

Is it possible to extract information from these disks without the card? I only have 4 drives and lots of free SATA ports to connect them all.

I was doing RAID5.

## Formal definition of the RAM model with D blocks B disks, fast memories M and P processors

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