#StackBounty: #ssd #sas #seagate Does IO performance degrade when a SAS SSD is attached with redundancy?

Bounty: 100

I have some Seagate Nytro SSDs (model xs800le70004), SuperMicro SAS3 JBODs (2C models with redundancy), LSI 9300 SAS3 Cards, and SAS HD Cables (SFF-8644).

When the SSDs are attached with both primary and redundant links, the performance drops to 72% of the performance when only attached via the primary. Even when talking directly to the drive on the primary link, if the redundant link is attached, the performance suffers. This performance degradation is across basically all types of IO, read,write,r&w, 4KiB-512KiB IO Sizes, QD1-QD16, and different thread counts ("jobs" in fio).

If for instance, a server is connected with a single primary link, but another server is connected with the redundant link, the performance suffers to the server with a single primary link.

My expectation was that the drive would need to be accessed via multipathing to achieve the drive’s full performance, but not that the performance for the drive would degrade for any use case less than completely saturating the drive via both links.

So, my question is, is this normal? Should I expect that this performance penalty is a typical tradeoff for the redundancy?


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#StackBounty: #windows-10 #hard-drive #ssd Laptop Shows Corrupted SSD

Bounty: 50

I have noticed for a while now my laptop, upon start-up, shows that I have 2 corrupted SSD’s. This is concerning because my laptop should be super great. I wasn’t too alarmed until I started researching a bit and noticed that while in the Disk Manager I cannot seem to see the SSDs. I only see the HDDs.

Is there something I am missing because on start-up it loos like the SSD’s are corrupt but then it looks like they’ve been cloned and are fine? But if that’s true then what would make me unable to see the SSD’s in the Disk Manager? If they are corrupted, how can I repair them? I don’t care about data loss. I simply would like the disks actually usable and viewable.

Here are some photos:

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#StackBounty: #linux #raid #ssd #software-raid SSD/NVME friendly MD RAID1 rebuild in Linux

Bounty: 50

I use SSD and NVME RAID1 arrays to store mostly virtual machine disks. More than 75% of the data are zeros (preallocated images, free space).

If a disk fails and gets replaced, the rebuild copies and writes all the data to the replacement disk, which causes thermal throttling in NVME, and I assume more wear on the SSD/NVME. Is there a way to configure the rebuild to compare data from both disks first and write to the new disk only if needed?

Or are SSD/NVME chips supposed to check whether the data are just zeros and if the target blocks are not written yet (giving zeros on read), it would just discard the data without wasting write cycles?
Or if there is any target data should it just trim the block to produce zeros?

I found an old thread at https://www.spinics.net/lists/raid/msg57529.html
but it did not provide an answer.

I tried a workaround but I think it is ugly plus the RAID must be offline.

mdadm --fail /dev/md0 /dev/sde
mdadm -r /dev/md0 /dev/sde

(replace /dev/sde)

mdadm -S /dev/md0
ddpt if=/dev/sdd of=/dev/sde verbose=1 oflag=sparing
mdadm -C -v /dev/md0 --assume-clean -l 1 -n 2 /dev/sdd /dev/sde

Any ideas for compare-write RAID1 rebuild? Thanks.


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#StackBounty: #windows-7 #hard-drive #ssd How to discover when HDD/SSD was detached?

Bounty: 50

I would like to check when was the last time (with date) a particular SSD was detached from my computer (Windows 7).

I know that I can find some information on the registry and on the event log, but I´m not finding anything useful, such as an error due to detaching the device or a specific event.

I know also that there are tools such as USBDeview that shows the history of connected USB and flash drives, but I haven’t found anything similar for hard drives.

Any ideas?


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#StackBounty: #windows #hard-drive #partitioning #ssd #disk-management Can't extend my drive: “There is not enough space available …

Bounty: 50

“There is not enough space available on the disk to complete this operation”: disk_management

Why am I getting this error? I’ve just decided to run linux on a VM to speed up the change between OS and ripped of my Ubuntu to set the things. But now I can’t extend my SSD’s partition using the Windows’ tool. Did some google and found different reasons behind the same issue.

Can anyone help me?


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#StackBounty: #windows #hard-drive #partitioning #ssd #disk-management Can't extend my drive: “There is not enough space available …

Bounty: 50

“There is not enough space available on the disk to complete this operation”: disk_management

Why am I getting this error? I’ve just decided to run linux on a VM to speed up the change between OS and ripped of my Ubuntu to set the things. But now I can’t extend my SSD’s partition using the Windows’ tool. Did some google and found different reasons behind the same issue.

Can anyone help me?


Get this bounty!!!

#StackBounty: #windows #hard-drive #partitioning #ssd #disk-management Can't extend my drive: “There is not enough space available …

Bounty: 50

“There is not enough space available on the disk to complete this operation”: disk_management

Why am I getting this error? I’ve just decided to run linux on a VM to speed up the change between OS and ripped of my Ubuntu to set the things. But now I can’t extend my SSD’s partition using the Windows’ tool. Did some google and found different reasons behind the same issue.

Can anyone help me?


Get this bounty!!!

#StackBounty: #windows #hard-drive #partitioning #ssd #disk-management Can't extend my drive: “There is not enough space available …

Bounty: 50

“There is not enough space available on the disk to complete this operation”: disk_management

Why am I getting this error? I’ve just decided to run linux on a VM to speed up the change between OS and ripped of my Ubuntu to set the things. But now I can’t extend my SSD’s partition using the Windows’ tool. Did some google and found different reasons behind the same issue.

Can anyone help me?


Get this bounty!!!

#StackBounty: #windows #hard-drive #partitioning #ssd #disk-management Can't extend my drive: “There is not enough space available …

Bounty: 50

“There is not enough space available on the disk to complete this operation”: disk_management

Why am I getting this error? I’ve just decided to run linux on a VM to speed up the change between OS and ripped of my Ubuntu to set the things. But now I can’t extend my SSD’s partition using the Windows’ tool. Did some google and found different reasons behind the same issue.

Can anyone help me?


Get this bounty!!!

#StackBounty: #windows #hard-drive #partitioning #ssd #disk-management Can't extend my drive: “There is not enough space available …

Bounty: 50

“There is not enough space available on the disk to complete this operation”: disk_management

Why am I getting this error? I’ve just decided to run linux on a VM to speed up the change between OS and ripped of my Ubuntu to set the things. But now I can’t extend my SSD’s partition using the Windows’ tool. Did some google and found different reasons behind the same issue.

Can anyone help me?


Get this bounty!!!