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• Scaling databases with cheap SSD hard drives

  - by Dennis Kashkin

  Hey guys! I hope that many of you are working with high traffic database-driven websites, and chances are that your main scalability issues are in the database. I noticed a couple of things lately: Most large databases require a team of DBAs in order to scale. They constantly struggle with limitations of hard drives and end up with very…

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• Using udev to create a character device based on a driver being loaded

  - by SteveCB

  I'm in the process of setting up RAID monitoring for a number of Dell servers that use the PERC 6i integrated card. We're using Nagios at present and the check_megasasctl plugin seems to fit the bill. However, the plugin relies upon the existence of: /dev/megaraid_sas_ioctl_node This device node doesn't exist by default, you have to…

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• Flash Backed Write Cache (FBWC) without capacitor pack

  - by Martyn

  I brought a HP Smart Array P410 controller and it is installed and working fine in a HP Prolient Microserver with 4 drives in two RAID 1 arrays. I didn’t realise however that it came without any cache so would only work by directly writing straight to the disk, and the performance was horrible. So I then brought the 512MB Flash…

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• Would an array of SSD drives be able to succesfully substitute the system memory?

  - by Florin Mircea

  I watched a few videos trying to answer this. This video (youtube.com/watch?v=eULFf6F5Ri8) shows a bunch of guys stacking 24 SSD's reaching a peak of around 2GBps r/w. That's under the limit of the worst DDR3 in this list (memorybenchmark.net/write_ddr3_amd.html) - that shows DDR3 memory performance varying from 2.78 to 6.55 Gb…

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• Why database partitioning didn't work? Extract from thedailywtf.com

  - by questzen

  Original link. http://thedailywtf.com/Articles/The-Certified-DBA.aspx. Article summary: The DBA suggests an approach involving rigorous partitioning, 10 partitions per disk (3 actual disks and 3 raid). The stats show that the performance is non-optimal. Then the DBA suggests an alternative of 1 partition per disk (with more…

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• Can a non-redundant RAID5 cause any serious problems (compared to RAID0)?

  - by leemes

  I used to have a three-disc RAID5 (mdadm) in my computer for personal media storage (music, videos, photos, programs, games, ...). It had three discs with 750 GB each, resulting in an array capacity of 1.5 TB. One day (one year ago), I needed one of those discs to install another operating system. I thought, I don't need the…

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• file read performance degrades as number of files increases

  - by bfallik-bamboom

  We're observing poor file read IO results that we'd like to better understand. We can use fio to write 100 files with a sustained aggregate throughput of ~700MB/s. When we switch the test to read instead of write, the aggregate throughput is only ~55MB/s. The drop seems related to the number of files since the throughput…

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• WD1000FYPS harddrive is marked 0 mb in 3ware (and no SMART)

  - by osgx

  After reboot my SATA 1TB WD1000FYPS (previously is was "Drive error") is marked 0 mb in 3ware web gui. Complete message: Available Drives (Controller ID 0) Port 1 WDC WD1000FYPS-01ZKB0 0.00 MB NOT SUPPORTED [Remove Drive] SMART gives me only Device Model and ATA protocol version 1 (not 7-8 as it must be for SATA) …

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• Why is domU faster than dom0 on IO?

  - by Paco

  I have installed debian 7 on a physical machine. This is the configuration of the machine: 3 hard drives using RAID 5 Strip element size: 1M Read policy: Adaptive read ahead Write policy: Write Through /boot 200 MB ext2 / 15 GB ext3 SWAP 10GB LVM rest (~500GB) emphasized text I installed postgresql, created a big…

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• Have a server, need to figure out a method of backup

  - by PolishHurricane

  My company has an older Dell 2650 server running ArchLinux x64: http://www.dell.com/downloads/global/products/pedge/en/2650_specs.pdf (2 x 2.4GHz Intel Xeon w/around 3287 RAM according to "free -m") We use it to host our internal company site and to post some information from our orders to and we'd like the…

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• RAID & UNIX UFS Data Recovery ? Is Data Recovery Always Possible?

  For those in the RAID data recovery field, those instances of data recovery that are most interesting are when there are multiple issues to contend with. Therefore when you combine a RAID failure wit... [Author: Michiel Van Kets - Computers and Internet - May 05, 2010]

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• Do I need to be worried about these SMART drive temperatures?

  - by Steve Lorimer

  I have 5 hard drives in a machine sitting in a cupboard. /dev/sda is a 500GB Seagate drive, and is the boot disk. /dev/sd{b,c,d,e} are 2TB drives in a raid6 configuration. smartctl is showing significantly higher temperatures (like ~140 degrees celsius) on the raid drives than the boot drive. Do I need to…

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• fd partitions gone from 2 discs, md happy with it and resyncs. How to recover ?

  - by d0nd

  Hey gurus, need some help badly with this one. I run a server with a 6Tb md raid5 volume built over 7*1Tb disks. I've had to shut down the server lately and when it went back up, 2 out of the 7 disks used for the raid volume had lost its conf : dmesg : [ 10.184167] sda: sda1 sda2 sda3 // System disk [ …

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• 2-Bay External HDD Enclosure in JBOD mode fails to detect both drives (Linux & Windows)

  - by mgc8888

  I recently purchased a couple of USB 3.0 External HDD Enclosures to use for storage and backup; the idea was to have one act as backup to the other, with 4 x 3TB drives in total. However, the second drive in each is not accessible in either Linux nor Windows, and I could not determine the reason. 1.…

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• What is an "invalid sas address present in mfc data"?

  - by Michael

  What is this error?

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• Server 2008 RAID5 resynching

  - by benpage

  I built a W2K8 R2 server last weekend, and built a R5 array using Disk Management, 5x 1TB drives. For the next 60 hours the status said 'Resynching (X%)' as it built the array. during this time i did read and write to the drive (slowly) and once the rebuild was complete speeds were quite fast. I was…

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• HP SmartArray P400 has slow read and write speed

  - by Tadas D.

  I have desktop in which I installed HP SmartArray P400 controller with two HP DF0146B8052 hard drives. I made RAID0 logical volume from them, but I am getting 20MB/s write speed and ~140-120MB/s read speed. Also there is quite low scatter for benchmark results (I am getting quite nice line) and it…

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• Backup NAS to another NAS?

  - by Tronic

  hey there, is there a way to backup / transfer a NAS (it's like a big harddrive with some access to a webinterface, but closed linux etc.... only two ethernet ports) to another one? or is the only way to connect both NASs to my computer and copy the data from one to the other? it's like 750gb of…

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• Hard drive device names are different from one reboot to another in Ubuntu.

  - by Mike

  I have an Ubuntu machine (10.04 but had the same problem in 8.04) with a bunch of drives that I use as a file server. 1 SATA that I boot off of. 2 IDE that in RAID1 and 2 SATA in RAID1. The problem is the drives that I have in RAID1 change device names on reboot. This is a problem because the in…

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• Hard drive device names are different from one reboot to another in Ubuntu.

  - by Mike

  I have an Ubuntu machine (10.04 but had the same problem in 8.04) with a bunch of drives that I use as a file server. 1 SATA that I boot off of. 2 IDE that in RAID1 and 2 SATA in RAID1. The problem is the drives that I have in RAID1 change device names on reboot. This is a problem because the in…

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• How to understand the LSI HBA connector specs?

  - by Sandra

  When reading the specifications for the LSi SAS 9206-16e HBA, it says Storage Connectivity; Data Transfer Rates * 16 ports; 6Gb/s SAS 2.1 compliant SAS Bandwidth * Half Duplex 2400MB/s, x4, 6Gb/s SAS lanes Port Configurations * 16 ea, x1 ports (individual drives) * 4 ea, x4 wide ports *…

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• Event Log: atapi - the device did not respond within the timeout period - Freeze

  - by rjlopes

  Hi, I have a Windows Server 2003 that stops working randomly (displays image on monitor but is completely frozen), all I could found on the event log as causes were an error from atapi and a warning from msas2k3. The event log entries are: Event Type: Error Event Source: atapi Event…

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• KVM guest io is much slower than host io: is that normal?

  - by Evolver

  I have a Qemu-KVM host system setup on CentOS 6.3. Four 1TB SATA HDDs working in Software RAID10. Guest CentOS 6.3 is installed on separate LVM. People say that they see guest performance almost equal to host performance, but I don't see that. My i/o tests are showing 30-70% slower…

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• Migrating RAID6 array from HP SmartArray P600 to LSI MegaRAID SAS 8888ELP

  - by MLu

  My customer has an external RAID6 array (8x 1TB in HP MSA60 enclosure) attached to HP SmartArray P600 controller. They have now decided to replace the server and the new one comes with LSI MegaRAID SAS 8888ELP. The HW supplier insists the migration is as simple as pulling the eSATA…

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• Minimum number of disks to implement RAID6

  - by Upul

  Hi All, RAID6 is intended to provide fault tolerance in the event 2 disks fail. What is the minimum number of disks required to implement RAID6? thanks

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