0
votes
1answer
33 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 ...
-2
votes
1answer
62 views

Why does a low level format take very long time?

I can write ~100MB/s on a particular 4TB SAS drive when it have a file system on it, but a low level format on this drive took >16 hours. That's ~70kB/s. Since there is not filesystem and only zeroes ...
0
votes
1answer
99 views

Install Winsat on server 2012? Windows System Assesment Tool

I use winsat disk to see my disk read / write speed windows 8 and it works great: cmd : winsat disk -drive c Can this be used on windows server 2012?
0
votes
0answers
43 views

How do I check disk performance of LVM drive?

I have a CentOS server with 2 hard drives configured to use LVM over RAID1. How do I benchmark my hard drive? As seen in this question, I have used the following commands: # check read performance ...
0
votes
1answer
256 views

High CPU load caused by slow disks?

We are running a online application on a 3-year old server (quadcore Xeon, 4GB RAM, SAN-disks). The server hosts besides the web application a SQL-, FTP-, SFTP, SMTP, and POP-services. Over the years ...
1
vote
0answers
119 views

best setup for fast sustained streaming (sequential?) disk writes

i am setting up a high speed/high resolution scientific image acquisition system. i need data write rates of ~1 GB/sec sustained for ~1 hour. i don't have experience with raid, but my plan is to ...
0
votes
0answers
266 views

High disk usage in CSRSS.EXE

I recently started working on the server for a certain software (Tango). The users complained that it recently became extremely low, so I used an application (ProcessHacker) to see the resource usage ...
2
votes
1answer
52 views

Benchmark individual drives in RAID5

I'm running a server with 3 RAID5 arrays through an ARECA 1880i coupled with a HP-SAS Expander. After experiencing a massive degradation in performance lately, I want to benchmark the drives ...
0
votes
0answers
68 views

Why parsing directories are so slow?

I have a directory with 136 000 files for a total of 1.8GB. The server has: 8 Cores - Intel(R) Xeon(R) CPU E5606 @ 2.13GHz 25GB RAM Ubuntu 12.04.2 LTS Hardware RAID 1 (LSI Logic / Symbios Logic ...
0
votes
2answers
212 views

Will adding RAM improve web server disks read performance?

I'm wondering if in case of linux based web server, serving the same static files over and over again, adding RAM will improve read performance? It should probably add to size of page cache, and ...
2
votes
2answers
200 views

Disk Monitoring with cronjobs — report disk issues

Is there a way to monitor disk health and send cronjob reports for errors? I know you can use smartctl -s on -a /dev/hda to pull information but just wondering if there is a way that could be used to ...
0
votes
1answer
2k views

High load and iowait on MySQL database server leads to slow MySQL INSERTS

I have a MySQL database server runnuing on Ubuntu 12.10 with 64GB RAM, 2x3 TB SATA 6 Gb/s HDD 7200 rpm and software RAID 1 and an Intel Core i7-3930K. The database server is accessed over a local ...
3
votes
1answer
2k 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 ...
-1
votes
1answer
69 views

Seeking faster access/transfer times for accounting application [closed]

Our accounting software, Sage 50, has been getting slower to open on workstations and reading the company file. The company file only contains 2 years worth of transactions, and we just cleared out ...
10
votes
2answers
6k views

High disk I/O - jbd2/sda2-8 process

I have run a file server on a CentOS 5.8 final server. My only concern at the moment is what appears to be intermittent but continuous high disk I/O activity causing a general slowdown because of ...
2
votes
2answers
141 views

Do we need to perform disk checking periodically on Linux

Do we need to perform periodic disk checking,for bad blocks and bad sectors?. Our servers havent been restarted for last 4 months,also no disk checking have been performed on any disks. Can that can ...
0
votes
1answer
299 views

How does AWS Provisioned IOPS EBS volumes compare to dedicated disk [closed]

In the past, no one can answer the performance difference as they are not well documented. Now AWS offer Provisioned IOPS EBS volumes Let say you now you buy 1000 IOPS, how does this value compare ...
2
votes
1answer
406 views

Solaris 10: Drop disk cache? (to benchmark app)

Is there a command to drop the ZFS and UFS disk caches? (Preferably just one folder hierarchy.) I'm trying to tuning the performance settings of an application that read/writes data from a large ...
1
vote
1answer
604 views

Are intermittently slow disk read speeds ever caused by the OS itself?

I'm noticing intermittently slow disk read/write speeds on my CenTOS 5.x VM. Sometimes hdparm will report: /dev/sda3: Timing buffered disk reads: 6 MB in 3.03 seconds = 2.04 MB/sec Other ...
1
vote
1answer
1k views

Any performance difference to identical spec of LFF disks vs SFF disks?

Example: HP 146GB LFF 6G SAS 15k vs HP 146GB SFF 6G SAS 15K bit-size, cache, interface speed and rpms are the same, physical size is obviously different -- what about actual real life tested ...
7
votes
2answers
3k views

High disk I/O when cache is used?

A few days ago I noticed a disk I/O wait and disk activity drop (which was great). Then I also notice that my cache was full(*) and fragmented. Then I flushed cache. After that, disk latency and disk ...
1
vote
3answers
251 views

8MB/10K RAID5 vs 2x 64MB/7.2K RAID10

I'm looking at replacing an old file server sharing a single RAID5 volume powered by 6 10K rpm disks with 8MB caches. The replacement will be 2 RAID10 volumes of 4 disks each. The new disks have 64MB ...
2
votes
5answers
3k views

Performance gains of putting Windows pagefile on separate partition (same disk)?

I am making a drive image that will be deployed to several computers, and I'm tweaking it for performance. It is a Windows XP image. Considering there is only one hard drive, will the machine gain ...
1
vote
3answers
4k views

Can cloning a hard disk drive to a SSD drive physically damage the SSD or the performance of the SSD?

I have a new SSD drive, I want to use it to replace the old mechanical hard disk drive in a laptop. The laptop had a new O/S (Windows 7 64-bit) installed about 9 months ago and I want to know if it's ...
0
votes
5answers
675 views

What are the more reliable SSDs to use in an enterprise environment? [closed]

We all know SSDs are fast... but aren't all that great when it comes to any computer that writes to disk many times in any given minute. Are there any SSDs that are suited for an enterprise ...
3
votes
3answers
1k views

Large disk queue length

A few days ago disk on my server started to have large queue length: I've changed controller battary recently, HP configuration utility was saying the battery is bad, but after changing the battery ...
0
votes
2answers
783 views

Disk warning 51 on Windows 2008 x64 Standard R1

I keep getting a disk warning 51 message in the system log every few months. It eventually causes the server to crash (killing all my network services), forcing me to do a hard reboot. Full error ...
0
votes
1answer
522 views

Linux - Test the write speed of an NTFS HDD USB drive

I have a Debian box with an USB HDD drive formated in NTFS connected to it. I would like to test the write speed of it because with samba, when I upload files to it from my Windows 7 laptop, I got ...
61
votes
8answers
5k views

How can a single disk in a hardware SATA RAID-10 array bring the entire array to a screeching halt?

Prelude: I'm a code-monkey that's increasingly taken on SysAdmin duties for my small company. My code is our product, and increasingly we provide the same app as SaaS. About 18 months ago I moved ...
2
votes
1answer
2k views

High disk I/O activity in CentOS server

I have about 16 websites in a CentOS dedicated, and I am having some problems on high traffic hours, it seems to be a high disk I/O activity causing a general slowdown. I've installed atop and this ...
1
vote
1answer
346 views

How is the average seek of disk estimated given a function to move head to n track

How is the average seek time of disk calculated if a function f(x) is given as an estimate of time to move head of disk to n tracks?
1
vote
2answers
921 views

How much space should I leave free on an SSD to ensure performance and stability?

I have heard from various sources that if you use close to all of the storage on your disk you will run into performance and/or reliability issues. Is this also true of SSDs? If so how much free space ...
1
vote
2answers
1k views

How much performance cost for hdd encryption on NAS?

I recently purchased a NAS and it offers encryption. It is a QNAP TS459 Pro II. How much will performance be impacted if I choose to encrypt the data on the device?
0
votes
2answers
256 views

Identifying the Bottleneck on a Static File Server at 1000 requests/sec

This is something that has plagued me for a very long time and I'm really hoping someone could help me out. I'll keep it short and simple: I have a file server (2x Dual Core Xeon 2.0, 8GB RAM, 132 ...
0
votes
3answers
181 views

Hybrid disks in a server

Has anyone here tried using the Momentus XT Hybrid disks in a real server as balance between performance and cost? What were the results? I've heard desktop-focused reviews on both sides: a few ...
1
vote
0answers
144 views

SAS disk performance drops a while after reboot on cent 5.5 boxes

So we have some workstations with identical hardware. The Fedora14 box has a couple weeks uptime and still get good performance. hdparm -tT /dev/sda /dev/sda: Timing cached reads: 21766 MB in ...
-1
votes
2answers
122 views

Hard Disk Speed for Virt Laptop [closed]

If I want to run a few dev VMs on a laptop, how fast do my drives realistically need to be? I do not expect lightning fast performance, but the last time I tried this on a Lenovo Thinkpad T400, ...
0
votes
1answer
535 views

HD latency measurement using bonnie++ on different machines with different RAM size

I have run bonnie++ v1.96 on two different servers without any additional load. One server is a "physical" Dell server with 32GB RAM, the other one is a virtual instance with 14GB RAM. I have read in ...
3
votes
3answers
8k views

How to create a RAM Drive (RAM Disk) in Windows 2008 R2?

There are lots of tools for creating RAM drives. None of them seem to work for windows 2008 R2. Does anyone know if this is possible and if so how. Does anyone know of a tool that does work? I've ...
6
votes
3answers
9k views

How is disk speed measured and what is fast? How long should a copy of 1500 GB take?

How is disk speed measured? Is it Mbit or Mbyte per second read? What is average today and what is fast and what is very fast in the industry? Let's say somebody says it takes a long time to make a ...
0
votes
1answer
663 views

Hard-Disk Performance: Two Partitions (Raid) vs One Large Partition (Raid) for VMs?

I have a dedicated machine (host) that will host two guests (Virtual Machines via KVM). What is better in regard to IO Performance: Sorry, important update, by RAID I mean RAID-1 (and I will not ...
3
votes
2answers
1k views

Poor performance from SAS disks on HS22 blade in CentOS/RHEL on ESXi 4.0

I have an HS22 blade configured with two 600GB 10K 6Gbps SAS drives configured in RAID1 using the onboard LSI Logic controller. Running on it is VMWare ESXi 4.0u2, and on top of that are a couple VMs. ...
3
votes
1answer
407 views

Which part of of a hard drive has the highest throughput, beginning or end of drive?

If I create a partition at the end of the drive does that create the partition on the outside of the platter where the data is passing under the drive heads fastest?
0
votes
3answers
535 views

Performance problem on a VMWare ESX virtual hard drive

I have performance problems on a virtual hard drive on a VMWare ESX 4.0 virtual machine. See the weird following sequential read speed graph: I passed the test several times, and the shape is ...
1
vote
1answer
440 views

147GB vs. 146GB HP Drives

I'm kind of scratching my head here. One of our clients has a DL180 with 4 x 146GB SAS drives, they show up in ACU as 147GB drives. We ordered spares from HP, and they show as 146GB in ACU and ...
1
vote
2answers
475 views

Will solid state drive improve performance of a database?

I have a Microsoft SQL Server 2008 database which contains approximately 3 GB of data. The server has 4 GB of RAM. The database is used both for reading and for writing data (lots of changes). The ...
0
votes
4answers
261 views

RAID vs Separate HDD's

What would be more efficient? Let say we have 2 hdd's. Consider this scenario: There are 2 simulations requests. In the RAID-0 setup the speed of the response will be boosted by the array. In ...
1
vote
1answer
2k views

Writing on an external USB hard disk is very slow on my local Linux CentOS server

I have this external harddrive: _ Buffalo Ministation TurboUSB HD-PS250U2 250 GB _ just formatted using ext3 _ 250 GB _ interface USB2 _ SATA 150 internal interface _ no hardware encryption _ full ...
0
votes
2answers
271 views

Zabbix machine is going crazy with HD writes!

I recently installed Zabbix on a Ubuntu box I had sitting around. It's only monitoring 2 servers but I've noticed that it's continuously smashing the HD with writes. I don't remember Zabbix being this ...
1
vote
2answers
934 views

Identifying Hard Drive as performance bottleneck for desktop machines

I'm working in a development team where we all use laptops so we can work in multiple locations. These laptops are proving notoriously slow for development work, but at a glance they all look to have ...