All Questions
Tagged with performance ssd
82
questions
0
votes
1
answer
487
views
Disk speed on Azure Virtual Machine Scale Set is slower than advertised
I have an Azure Service Fabric cluster with 5 nodes, baked by an Azure Virtual Machine Scale Set. The size of the instances is Standard_D2ds_v4 with an advertised disk speed of max 3200 IOPS. At the ...
- 111
-1
votes
1
answer
1k
views
8 x 15k SAS hdd disk with raid 0 performance vs single SSD disk for database [closed]
Which one has a better performance for database application (e.g. postgres) if we just consider read/write operations speed and not fault tolerance
8 x 15k SAS hdd disk with raid 0
single SSD disk
- 1
-1
votes
1
answer
842
views
Hyper-V on Server 2019 - the larger the VHDX file the slower the disk speed
We have a brand new pair of servers for Hyper-V with fast RAID 10 SSDs in 2 arrays. On the host, using Crystal Disk Mark, I get speeds that I would expect like RND64K Q32T12 = 4712.49 MB/S while the ...
- 9
8
votes
3
answers
5k
views
Tmpfs vs NVME SSDs from performance POV [duplicate]
I have a script that creates large temporary files.
I'm inclined to use tmpfs for this, however I did a quick search for tmpfs performance and found this which reports speed as about 2GiB/s.
Modern ...
- 212
1
vote
1
answer
654
views
How do I know if SSD is the bottleneck in Linux?
I have a database server which uses a Samsung 840 pro disk. The load is constantly higher than usual, even if there is not much activity on the website. So I suspect the disk has worn out. But how can ...
- 113
4
votes
1
answer
2k
views
Slow RAID performance for Samsung EVO's
So I've been suspecting performance bottlenecks on a Samsung EVO 850 RAID1 for sometime, but honestly been too lazy to look into it. Now I was starting a new home project, involving a Vmware ESXi host ...
- 51
0
votes
1
answer
10k
views
Ceph hardware sizing calculator
I would like to calculate the Hardware sizing for a ceph cluster. There are so few references to the sizing, that I try to get these details here in the community.
E.g. what shall i have depending on
...
- 277
3
votes
2
answers
1k
views
Is swap compression in RAM (ZSWAP) benefitial on a Linux server with SSD drives?
I am trying to improve performance (responsivity) of a webserver during rare events of high memory utilization (90%...) where it starts to swap a lot, in order to help manual intervening faster and ...
- 282
5
votes
2
answers
1k
views
Server Hot Swap Hard Drives
We have a HP Proliant DL380 G9 server. We have a separate data drive which consists of 4 x 1TB 7.2k 6Gb hot-swappable SAS drives RAID 5'd to provide a 3GB logical drive. We've noticed the performance ...
David Colley
1
vote
1
answer
585
views
Best Practices for Deploying Microsoft SQL Server on AWS on EC2 instance with SSD storage
Does it makes sense to install SQL Server 2017 on one single SSD drive on m5.xlarge with tempdbs, databases, program files, backups and logs for best performance?
According to Amazon EBS specs the ...
- 11
3
votes
1
answer
1k
views
Can consumer SSD over-provisioning improve performance?
While reading up on ways to improve SSD endurance, I came across an Intel whitepaper on the subject of SSD over-provisioning (limiting the host-adressable space on a drive or not including some of the ...
- 31
1
vote
0
answers
261
views
Difference in utilisation reported by iostat for two identical disks in RAID1
I'm trying to debug some weird behaviour with Postgres performance and am trying to understand the iostat output. I'm on 2x SSD on RAID1. Why would one of the disks be reported at ~21% utilisation ...
- 489
0
votes
0
answers
99
views
Using hdparam for more strenuous tests
So I am tasked with getting some strenuous raw hard drive performance tests. We started with FIO but this has proven to be ineffective as the results are poor in windows and linux.
I tried Bonnie++ ...
- 217
6
votes
2
answers
1k
views
Why do my SSD read latency benchmarks get markedly worse when I put an XFS filesystem on top?
I am benchmarking a small server box based on the SuperMicro E300-8D. I've installed the latest CentOS 7.5 with the latest updates, 64GB of DDR4-2100 RAM, and a Samsung 970 EVO 1TB NVMe SSD. The OS ...
- 305
0
votes
0
answers
532
views
SSD performance on Ubuntu + Nginx
I'm trying to improve the performance of server for nginx 100TB/month images distributions. But I have two problems: high CPU load and periodical splashes (I don't know why)
Hardware is quite poor (...
- 103
1
vote
4
answers
513
views
Why does disk latency drop during periods of heavy writes?
Looking at the output of Munin's diskstats plugin (which is reading from /proc/diskstats) I'm noticing what seems peculiar to me. The disk is a SSD, and I would assume, magnetic or solid state, that ...
- 11
0
votes
1
answer
580
views
MySQL perf bad on SSD-based server. Small tables. MySQL config? RAID?
I have a couple of servers in an industrial setting (air-gapped network) that do some fairly light telemetry gathering. We generate about 10GB of telemetry history in ~30 days.
All telemetry goes ...
- 31
6
votes
1
answer
4k
views
SSD IOPS on linux, DIRECT much faster than buffered, fio
I have a 30Tb-sized hardware RAID-6 system (LSI 9280-8e) of 10 DC-S4500 Intel SSDs that is used for database purposes. The OS Debian 7.11 with 3.2 kernel. The filesystem is XFS mounted with nobarrier ...
- 185
0
votes
1
answer
122
views
GCE Persistent SSD disks allocate more IOPS than specified
I've been testing GCE and created a VM with a persistent SSD disk to test disk performance. Persistent SSD disk that I configured was 37GB, which was supposed to give me 1110 IOPS but when I run ...
google-cloud-platform
0
votes
1
answer
771
views
Improving SQL speed - Can SSD and more RAM be effective?
I'm running a website on a VPS package on nomral Hard drive, and 3.25 GB RAM.
I created a test page and realized that by simply including an SQL command such as:
SELECT Name from table where Name IN ...
- 101
0
votes
0
answers
184
views
Why do I have very different read speeds at the same SSD?
In a Debian stretch, I did some quick tests for a 500GB Samsung SSD 840 read speed at all the different partitions and I cannot understand the results. My understanding so far was that the disk could ...
1
vote
0
answers
27
views
Performance decision on a 3-server HA scenario [duplicate]
I am setting up a new infrastructure for our current project, mgirating from a 2 server in 2 locations to a new 3 servers/3 datacenters... which should allow us to have a higher high availability.
...
3
votes
1
answer
10k
views
HPE 1.92TB SATA 6G Mixed Use SFF SSD very slow compared to SAS HDD HP disks
In below screenshot, I benchmarked 3 machines, 4 Drives. my main production based on DL580, HPE 1.92TB SATA 6G Mixed Use SFF SSD RAID 1.
MySQL insert time of 1 million rows is ~ 30 seconds in the SSD,...
- 254
1
vote
1
answer
847
views
Intermittent I/O delays on part of RAID array causing poor MySQL performance
I am managing a bare-metal server running a MySQL database as well as some other software. We are seeing performance issues with some MySQL queries, but the issues occur intermittently, and almost ...
- 13
9
votes
2
answers
8k
views
Why do sequential writes have better performance than random writes on SSDs?
An LBA (logical block addresses) is a mapping table implemented in the FTL to match between logical and physical pages/blocks in SSDs, my guess is that most SSDs (at least when they are empty) keeps ...
- 273
2
votes
1
answer
1k
views
Slow SSD performance - IBM X3650 M4 (7915)
I set up a test environment for development purposes. It consists of a IBM X3650 M4 (7915) server with:
2 x Intel Xeon E2690 @ 2.90GHz
96GB 1333MHz ECC RAM
2 x HDD 146GB 15k rpm
6 x SSD 525GB (...
- 179
5
votes
2
answers
20k
views
Does any PCIe slot support NVMe SSD's automatically or do I need a specific M.2 slot?
I have been trying to dissect the information I find with googling, but have come to the conclusion that I cannot find with certainty the answer to the following questions:
Given you know the basics ...
- 1,037
2
votes
2
answers
368
views
Determining if upgrading to a fast PCIe SSD drive is worthwhile on a dual Xeon Nehalem system with PCIe v2.0
I am considering upgrading my workstation (almost a server) with a bootable PCIe drive, the 2TB version of the Samsung 960 Pro. But having a system with PCI v2, SATA II I am not sure if this makes ...
- 1,037
1
vote
0
answers
2k
views
What is the optimal strip size/full stripe size on a RAID 10 array for a database server?
I'm setting up a new SqlServer database server at work. The machine is a HP Proliant DL368 Gen9 with the SSD disks. When trying to create the array, I have to select the stripe/full stripe size. This ...
- 111
1
vote
0
answers
139
views
SSD bandwidth issue and analysis
I have Intel's P3700 SSD mounted on a Lenovo x3650 M5 server with two Intel Xeon E5-2630 v3 CPUs. The server is running Ubuntu 14.04 with 4.6.4 Kernel.
I've been using fio to benchmark the SSD using ...
- 23
-1
votes
2
answers
2k
views
RAID0 SSDs slow on HP ProLiant
TL;DR Is the RAID controller on the HP ProLiant DL360 G7 known to be slow or problematic? My RAID0 set is performing horribly.
I have an HP ProLiant DL360 G7. It came with a 160GiB SAS HDD, and I ...
- 265
2
votes
2
answers
1k
views
How can SSD write performance be dramatically different on two identical servers?
I am renting two identical physical servers (at Serverloft). These servers come with 2x512 GB SSD disks, and I've set them up with mdadm in a RAID1. The disks are locally installed in the server.
The ...
- 1,578
3
votes
1
answer
2k
views
Hardware performance penalty for Hyper-V Generation 2 VMs
I have the following configuration:
Windows Server 2012 R2 OS installed on baremetal with Hyper-V. OS is
installed on RAID1 850 PRO drives.
Windows Server 2012 R2 Guest OS Generation 2 VM is located ...
- 163
0
votes
1
answer
72
views
Which bandwith can i expect, when i´m running a SATA SSD on a SAS interface?
So, i know this question had been asked before. I consider to buy a SSD for my Server, because i kinda hate the SAS HDDs in there.
I thought:
If i connect a SSD, which, in fact, handles way more ...
4
votes
0
answers
4k
views
Tuning mdadm RAID 5 performance?
I have a system with dual Intel E5-2620 v3 @ 2.40GHz, 64 GB ram, an LSI 3008 HBA, 8x 1.6 TB Intel S3510 SSDs. I've been playing benchmarking it in different configurations using fio and I've gotten ...
- 487
11
votes
2
answers
18k
views
does adding heaps of drives to a raid 0 increase performance?
does adding heaps of drives to a raid 0 increase performance?
i know that two drives in a striped raid will usually be faster than a single drive
but will i notice a difference in performance between ...
- 237
5
votes
2
answers
10k
views
Samsung 850 EVO + HP P410 limited iops?
I´m experiencing a weird write iops limitation with a HP P410 256mb cache controller and 4x consumer grade ssd´s (Samsung EVO 850) in RAID5/10. After upgrade to latest firmware (6.64) for HP P410 ...
- 63
2
votes
1
answer
1k
views
ssd performance against hdd performance
I have two server, one with a SSD, one with a HDD. I've been running hdparm to see the differences, but the results for Timing cached reads and Timing are quite equal/HDD is faster:
SSD:
Timing ...
- 123
9
votes
3
answers
32k
views
Why do servers have SAS instead of SSDs? [closed]
I was wondering why do servers still come with SAS disks instead of SSD disks? I know that SAS are faster than normal hard drives but they are still much slower than SSDs. I think they are more ...
- 101
3
votes
2
answers
1k
views
ncq not supported on an SATA3.0 HDD in an usb 3.0 casing
is there a well known reason why a SATA3.0 HDD supporting NCQ does not have NCQ queue depth configured when mounted from an usb 3.0 case ?
output for hdparm -iI /dev/sda shows NCQ is supported
output ...
- 73
1
vote
1
answer
955
views
6 times slower disk write in RAID10 on Ubuntu 14.04 after rebuild
OS: Ubuntu 14.04 LTS
Software Raid 10: 4x120Gb Intel 530 SSDs
Initial tests:
1.2 GB/s Write
5.2 GB/s Read
I did some tests to check if everything will go alright with a failed disk:
I set as ...
- 141
1
vote
0
answers
821
views
SSD+MDRAID+LVM+KVM results in lower performance than expected
We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
- 453
1
vote
2
answers
3k
views
Is it possible to use SSD for storage on Windows Azure?
There is some marketing-speak suggesting that it may be possible ..:
http://gigaom.com/2012/06/05/new-windows-azure-goes-all-ssd-to-one-up-amazon-in-the-cloud/
.. but I couldn't find any way to ...
- 121
4
votes
3
answers
11k
views
Does software RAID-0 really improve performance?
I am going to lease a server and I have two options, SATA or SSD, I decided to save the money and go for the SATA option. But I do not need all that storage they are giving me! So I thought MAYBE I ...
- 333
2
votes
1
answer
6k
views
How to erase a SSD to restore factory performance in Linux?
Due to big performance issues with an mdraid-1 array I'd like to pull down from the array one of the devices (Samsung 840 Pro), erase it to restore factory performance and re-add it to the array. The ...
- 105
2
votes
1
answer
897
views
Various problems with software raid1 array built with Samsung 840 Pro SSDs
I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB).
Problems:
Serious ...
- 105
0
votes
3
answers
1k
views
I/O on SSD hosting a DB periodically hangs with queue length peaks of 800+
i have a problem which i cannot identify correctly. I have a process (on WinSrv 2008 R2) which imports data into Mongo DB and periodically whole system freezes - once per 5-10-15 minutes for about 20-...
- 99
0
votes
2
answers
1k
views
Which alternative is most performant (raid, ssd, 15k rpm disks)
I'm looking at the DELL PowerEdge™ R720 from Hetzner.
This server has a Dell PERC H710 8 Port SAS/SATA 6GBit/s raid controller.
I have the choice between:
3 x 600GB SSD (MLC SATA 3Gb/sec)
6 x 600GB ...
- 111
-1
votes
1
answer
2k
views
Disk IO in Linux is slow (2MB/sec) while in Windows its fast (400MB/s) [closed]
I have a server with an ASUS board with a 256GB SSD
In Windows, using HDTune my drive shows 400MB/sec
on Linux, I'm getting about 2MB/sec using
root@desktop:/# dd if=/dev/zero of=/foo bs=1024k ...
- 697
6
votes
2
answers
7k
views
Why does storage's performance change at various queue depths?
I'm in the market for a storage upgrade for our servers.
I'm looking at benchmarks of various PCIe SSD devices and in comparisons I see that IOPS change at various queue depths.
How can that be and ...
- 2,372