- Mar 8, 2014
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Hey all,
I'm in the process of replacing my old home server with a new one and am running into some RAID performance issues. This is all on a Dell R710 server with a Perc 6/i hardware RAID card. I am running ESXi 6.0 and the guest OS is Windows 2012R2. The setup that I am having issues with are 2x Seagate Barracuda Green 2TB SATA drives.
I am trying to set these up in a RAID1 and the read/write performance is horrible. I can tell copying files its taking forever. Using CrystalDiskMark OR HDTune these are the sequential numbers I am seeing. Random R/W is even worse!
Single Drive READ- 120-150MB/s
Single Drive WRITE- 115-130MB/s
RAID1 Read: 50-70MB/s
RAID1 Write: 35-40MB/s
I started thinking maybe its because these are 5900 "green drives". I whipped out a pair of 7200 750GB SATA drives and got the same sort of results. Good performance on single drives but terrible on RAID1. The BBU is fine, the Read-Ahead and Write-Back caches are enabled. The array is also fully initialized, so that is not taking up any of the disk I/O. I also have a 3x 300GB SAS array on this controller for the OS and general storage - and its showing read/write performance in the 300MB/s range.
I am not sure what the issue could be, but I would think RAID1 would have equal or slightly less performance than a single drive. All BIOS and Firmware is completely up to date. I am thinking that I might just present the drives to the OS bare and either use Storage Spaces or something like DrivePool/Drive Bender to get my mirror... I don't have a whole lot of experience with RAID arrays outside of RAID5/6. I also don't have much experience with the Dell PERC so I would appreciate any suggestions that are offered!
I'm in the process of replacing my old home server with a new one and am running into some RAID performance issues. This is all on a Dell R710 server with a Perc 6/i hardware RAID card. I am running ESXi 6.0 and the guest OS is Windows 2012R2. The setup that I am having issues with are 2x Seagate Barracuda Green 2TB SATA drives.
I am trying to set these up in a RAID1 and the read/write performance is horrible. I can tell copying files its taking forever. Using CrystalDiskMark OR HDTune these are the sequential numbers I am seeing. Random R/W is even worse!
Single Drive READ- 120-150MB/s
Single Drive WRITE- 115-130MB/s
RAID1 Read: 50-70MB/s
RAID1 Write: 35-40MB/s
I started thinking maybe its because these are 5900 "green drives". I whipped out a pair of 7200 750GB SATA drives and got the same sort of results. Good performance on single drives but terrible on RAID1. The BBU is fine, the Read-Ahead and Write-Back caches are enabled. The array is also fully initialized, so that is not taking up any of the disk I/O. I also have a 3x 300GB SAS array on this controller for the OS and general storage - and its showing read/write performance in the 300MB/s range.
I am not sure what the issue could be, but I would think RAID1 would have equal or slightly less performance than a single drive. All BIOS and Firmware is completely up to date. I am thinking that I might just present the drives to the OS bare and either use Storage Spaces or something like DrivePool/Drive Bender to get my mirror... I don't have a whole lot of experience with RAID arrays outside of RAID5/6. I also don't have much experience with the Dell PERC so I would appreciate any suggestions that are offered!
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