All Questions
Tagged with performance raid
145
questions
8
votes
3
answers
857
views
Unexpected poor performance with NVMe drives on an X9DR3-F
I am experiencing what seems like uncharacteristically low performance from an NVMe SSD stripe in a server. The hardware is as follows:
Motherboard: X9DR3-F
CPU: Dual E5-2650v2
RAM: 128GB DDR3-1333 ...
- 379
1
vote
0
answers
382
views
Disk performance issues exclusively with RAID 10 (LVM RAID)
For some reason, I am suffering very poor disk performance on RAID 10, but normal performance on RAID 5.
For context, I have 4 x 1 TB hard drives in a server. They are the physical volumes within the ...
- 11
0
votes
2
answers
1k
views
File transfer between servers seems slow
I have two servers both running Rocky Linux v8.4, one hosts a raid drive that I use to back up a (very) large raid drive mounted on Server A as /home.
Server A (with the large raid of 70TB mounted as /...
- 1
1
vote
2
answers
1k
views
RAID Controller -- SAS Expander -- SATA drives. What max throughput can be expected?
I am building fast recovery solution. And there is a stuck with the choosing of the RAID controller.
I have a chain:
24 SATA SSD drives each performing at 4Gbit/s. Total write throughput is 96Gbit/s.
...
- 33
0
votes
1
answer
116
views
40Gbit/s RAID10 - on a single raid adapter is it possible?
I need an ultrafast backups restore for my solution.
I am going to use two hosts: operating server and backup server.
Both servers will be connected directly via 40Gbe PCIe 4.0 8x ethernet adapters so ...
- 33
16
votes
1
answer
3k
views
What's the difference between a "degraded" RAID 6 array and a "clean" RAID 5 array?
Suppose you have two RAID arrays, one with N disks and one with N+1 disks. The array with N disks was formatted as a RAID 5 and left alone, while the other array was formatted as a RAID 6 before one ...
- 306
-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
3
votes
2
answers
204
views
Disk write latency with and without RAID
I have run 2 tests with different setup as explained below. I'm using Azure VM Standard D64s v3.
For the first setup I have mounted 4 Premium SSD disks of 4 TB each, and am performing IO operations ...
- 131
2
votes
1
answer
404
views
About IOPS of a RAID5 disk array without cache
we are using a 530-8i RAID adapter,which is none-cache supported, on a Lenovo ThinkSystem SR590 server.And we have 4 HDD(600GB/10K RPM/SAS) in the array.
I read an article about calculating the disk/...
- 21
3
votes
1
answer
1k
views
Confirming parameters for XFS filesystem and LVM volume striping over 2 ADAPT (RAID6-like) volumes
We are setting up an ADAPT0 (RAID-60-like) configuration for a file server.
We have six disk pools. Each consists of 14 disks and is set up using ADAPT. According to Dell's official white paper, ADAPT ...
- 209
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
1
vote
2
answers
6k
views
RAID 50 vs RAID 10 for performance?
I have a server with 6 SSD's and a raid controller card that supports both RAID 10 and RAID 50 the plan is to use this as our Build server. It will be pulling in NPM Packages and many small code files,...
- 13
1
vote
1
answer
3k
views
Adding disks to existing RAID array
We want to increase disk space of one of our server. Currently it has 8 physical disks(4 x 480 GB, 4 x 1.9 TB) and 3 virtual disks(RAID 1 (2 x 480GB), RAID 1 (2 x 480 GB), RAID 10(4 x 1.9TB)). We want ...
- 111
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
0
votes
2
answers
374
views
RAID1 vs RAID5: read performances of a 2-disks array
I'm testing some RAID setups built with mdadm. This is about parallel reads on a 2-disks array.
RAID1 seems to balance the reads by process, some sort of coarse-grained balancing, so reading the ...
- 103
1
vote
1
answer
215
views
Bandwidth and IO issues when running hardware raid and zfs
I've inherited a setup using Linux Ubuntu 14, a megaraid_sas, and ZFS.
We're getting some performance problems (never being able to fully utilize the 6GB bandwidth from the raid) and I'm curious if ...
- 535
7
votes
1
answer
997
views
HP dl360p G8 writes/latency with SSDs in raid very poor
I have a DL360P g8 server with a HPE p420i raid controller (2gb cache).
We have noticed that writes to the SSDs via raid are incredibly slow.
The drives in question I have in the arrays are:
Volume 1 ...
- 71
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
1
vote
1
answer
1k
views
SQL on Azure VM Disk Striping and Location of Data/Log Files
Per the Performance best practices for SQL Server in Azure Virtual Machines documentation:
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/sql/virtual-machines-windows-sql-performance
...
- 143
14
votes
2
answers
13k
views
Impact of RAID levels on IOPS [closed]
With regard to IOPS, I have seen several sources on the web that suggest the IOPS of a given number of disks is simply the IOPS of a single disk multiplied by the number of disks.
If my understanding ...
- 1,852
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
1
vote
2
answers
942
views
How should I divide my 4 disks in my ZFS RAID 10 array?
I actually have 4 SATA 3.0 disks on my home server and I want to organize them in order to have the best performance on my 10 RAID ZFS array
Seagate ST2000DL003 - Capacity : 2TB, Bandwith : 6GB/s, ...
1
vote
1
answer
2k
views
Bad continuous write performance on RAID-5 when not writing huge amounts
I had some problems getting acceptable read/write performance for my RAID5 + crypt + ext4 and was finally able to track it down to the following problem:
Hardware
Hard disks 4x WD RED 3 TB WDC ...
- 263
0
votes
0
answers
602
views
How much cpu (and RAM) is used to rebuild an Intel RSTe RAID 5 (firmware/bios/fake)?
Let's say I have a dual CPU system with:
2 x Intel Xeon E5-2667 v4 3.20GHz 25MB Cache
3 x 1TB SATA3 Seagate Enterprise class in RAID5 on the Intel C612 RSTe Controller
Total final storage is: 2TB
...
- 101
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
4
votes
1
answer
587
views
Is it possible to create a software RAID 10 using SAN LUN's presented to server on 4 paths?
Is it possible to create a software RAID 10 using SAN LUN's presented to server on 4 paths?
I'm running Ubuntu 14.04 with 64 GB of RAM
Target is to achieve better I/O, storage and network teams have ...
- 87
18
votes
3
answers
16k
views
Suddenly slow RAID performance
We recently noticed our database queries have been taking much longer than usual to run. After some investigation, it looks like we're getting very slow disk reads.
We've run into a similar problem ...
- 361
-3
votes
1
answer
55
views
Has my RAID drive failed?
I checked the output of my server today and it said:
root@s01 [~]# mdadm --detail /dev/md1
/dev/md1:
Version : 1.1
Creation Time : Sat Jul 7 18:23:24 2012
Raid Level : raid1
...
- 107
0
votes
1
answer
318
views
Performance comparison of single RAID vs multiple filesystems
I'm trying to get maximum sequential disk throughput for an application on my Linux server. It has 7 SATA disks that I could put in one RAID0 or RAID5 using a hardware RAID controller (HP P420i). Or, ...
- 267
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
-1
votes
1
answer
76
views
Which raid array will be best practices with seven 1.2 tb hdd system
I have a server which have seven 1.2 tb hard disks. I have to create raid array but i don't decide which raid i use?
First of all, first and most important matter is security. At any cost i must not ...
- 9
6
votes
3
answers
5k
views
Linux raid10 on 2 disks
Linux mdadm has some quirks, one of them is building raid10 with only two disks. There are some reports that it's way faster (twice, both in read and write) as RAID1:
https://raid.wiki.kernel.org/...
- 1,125
12
votes
3
answers
13k
views
ZFS pool slow sequential read
I have a related question about this problem, but it got too complicated and too big, so I decided I should split up the issue into NFS and local issues. I have also tried asking about this on the zfs-...
- 6,270
0
votes
1
answer
2k
views
LSI MegaRaid 9260-8i low performance in comparison
I was given the task (aka dumped into my lap) to examine low Read/Write performance on a system running Server 2012 R2 /w HyperV role.
The system in question:
Lenovo RD340
LSI MegaRaid 9260-8i (no ...
- 1
-1
votes
1
answer
73
views
Handling the potential risk of writing random bits to storage during power loss with RAID [closed]
Is it possible for a power failure to cause some part of a machine to write one or more random bits to a storage device?
Someone proposed the following idea to address such a risk: create multiple ...
- 186
6
votes
1
answer
4k
views
HP MSA P2000 G3 Disk Scrubbing performance?
I have a HP P2000 G3 array with two 10Gbit iSCSI controllers in it that presents storage to my virtualisation cluster. It is soon to be expanded with two D2700 shelves each loaded with 25 10k RPM ...
- 1,011
1
vote
1
answer
171
views
RAID1 write penalty using mdadm - what's the cause?
When doing some performance tests writing to a SSD-based 3-way RAID 1 mirror powered by mdadm, it appears we suffer a significant write penalty of about 2.2x slower than doing the same test on just ...
- 1,318
1
vote
1
answer
97
views
postfix SMTP outgoing gateway server, Software RAID1 vs RAID1 + RAID 0 on 2 disks
I have this old smtp server that is currently running Windows 2003 and with EOL I want to move it to something that will continue to get security upgrades but at same time I want to improve ...
- 11
0
votes
1
answer
865
views
OpenZFS on OSX filesystem dataset performance issue
tl;dr - My ZFS RAIDZ2 array reads at 7.5+ GB/s and writes at 2.0+ GB/s when I specify a bs=128K or greater with dd. OS X is assuming 1K (as per stat -f %k .) and all my is ~300MB/s; dd gives the same ...
- 101
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
2
votes
1
answer
235
views
Are RAID 5 systems suitable for larger disk sizes?
Why is it generally considered that RAID 5 systems are not suitable for larger disk sizes? Is the same true for RAID 6?
- 31
1
vote
0
answers
160
views
File IO being slow
I've rented this root server with a RAID1 mdadm software raid setup.
Using dd to benchmark the file IO speed it achieves 230MB/s write (default blocksize). Certain tasks such as mysql are way slower, ...
- 111
86
votes
6
answers
116k
views
Software vs hardware RAID performance and cache usage
I've been reading a lot on RAID controllers/setups and one thing that comes up a lot is how hardware controllers without cache offer the same performance as software RAID. Is this really the case?
I ...
- 1,001
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
0
votes
2
answers
3k
views
RAID1 very slow with LSI card and 2x Samsung EVO 850 drives
not sure if I'm checking it correctly, but here is what I have.
Desktop, LSI 9260-8i card, see config below. 2x 500Gb Samsung 850 EVO drives.
I also have Samsung 830 drive attached to motherboard ...
- 213
1
vote
0
answers
33
views
Improve read performance on ext4 on Centos with software raid1? [duplicate]
I'm running a number of MongoDB nodes on dedicated servers running Centos6. Each machine has two SSDs which I have in Raid1 with two logical partitions:
# df -h
Filesystem Size Used Avail Use% ...
- 1,312
0
votes
0
answers
580
views
Azure disk performance
I am running on-demand, research D14 instance in Azure South Central US region, with a 4-disk RAID0. Recently the disk performance has become unusably slow, particularly the RAID performance, which is ...
- 101
2
votes
3
answers
101
views
distributing tables over multiple harddrives
Is there a performance improvement when I distribute database tables over different harddrives?
I need to access many different schemas at the same time and I was wondering if adding more harddrives ...
- 123