Open Source

Testing the benchmark scripts – 1

2 Comments / Benchmarks, File Systems, ZFS / By /

I’m getting very slow throughput on these drives during my first set of tests. I have no idea why… The drive in question is: $ grep ada2 /var/run/dmesg.boot ada2 at ahcich4 bus 0 scbus5 target 0 lun 0 ada2: <ST2000DM001-1CH164 CC24> ATA-8 SATA 3.x device ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) ada2: Command Queueing enabled ada2: 1907729MB (3907029168 512 byte sectors: 16H 63S/T 16383C) ada2: Previously was known as ad12 Here […]

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Benchmarking the TOSHIBA DT01ACA300 – ZFS

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This is a repeat of a benchmark I did yesterday. The drive is a TOSHIBA DT01ACA300 3TB HDD. This is a 7200 RPM SATA III drive. Tests were run with FreeBSD 9.1 in the hardware listed below. Tonight, we’re going to do the partitions slightly differently, and try ZFS. The hardware We are testing on the following hardware: motherboard – SUPERMICRO MBD-H8SGL-O ATX Server Motherboard (Supermicro link): $224.99 CPU – AMD Opteron 6128

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How I upgrade my WordPress installations

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I have three blogs run on WordPress. Each runs on its own installation of WordPress. Why? Because all the single-install solutions I’ve seen were not very attractive. Convince me otherwise. Following the official instructions, I drew up this set of instructions which work for me. Hopefully, they work for you too. But I’m sure it’d going to be cryptic at first. My WordPress is installed in the directory wordpress.installed. The webserver looks for

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zfsroot guides – which one to use?

2 Comments / File Systems, ZFS / By /

I started looking around for guides for creating a zfsroot. Here is what I’ve glanced at so far, along with some of my comments. I plan to create an 8 drive array, running raidz2. FreeBSD wiki page – seems OK ZFS-only booting by Ollivier Robert – based on 8.0, but I need to read it through again OPTI­MIZED FOR 4K-SECTOR DRIVES – interesting, but not set up the way I want my system

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Benchmarking the Samsung SSD 840 PRO Series DXM03B0Q – ZFS

3 Comments / Disks, File Systems, hardware, ZFS / By /

Following on from yesterday’s benchmark, I’m adding in some ZFS tests. All hardware is the same. Of note: $ zdb | grep ashift ashift: 9 $ sudo diskinfo -v ada0 Password: ada0 512 # sectorsize 128035676160 # mediasize in bytes (119G) 250069680 # mediasize in sectors 0 # stripesize 0 # stripeoffset 248085 # Cylinders according to firmware. 16 # Heads according to firmware. 63 # Sectors according to firmware. S12PNEACB31368P # Disk

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MIRROR/gm0 has changed from COMPLETE to DEGRADED

3 Comments / FreeBSD / By /

GEOM Watch sent me an email this morning: The status of GEOM MIRROR/gm0 has changed from COMPLETE to DEGRADED. The following components have been lost: ad6 Remaining components: ad3 Here’s the smartctl output: [dan@ngaio:~] $ sudo smartctl -a -i /dev/ad6 smartctl 5.43 2012-06-30 r3573 [FreeBSD 8.2-STABLE i386] (local build) Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net === START OF INFORMATION SECTION === Model Family: Maxtor DiamondMax Plus 9 Device Model: Maxtor 6Y120M0 Serial

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Aligned versus not aligned

1 Comment / File Systems, FreeBSD, Open Source / By /

In this post, we’re going to demonstrate why aligning your disk partitions can be a good idea. For starters, we’re going to go with the default alignment, do a test, then align, and redo the test. But first, in case you have no idea what I’m talking about, this randomly discovered post may be a useful primer. Create the scheme on the disk This command creates a GPT scheme on the drive. Create

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Aligning disk partitions for better throughput

7 Comments / File Systems, FreeBSD, Open Source / By /

During a recent install of FreeBSD 9.1 onto a gmirror, it was pointed out that my disk partitions were not aligned. Today, I’ll look at how that affects performance, both before and after alignment. Last night, I installed FreeBSD 9.1 onto a separate HDD, which I’ll use as a floater. I can attach this HDD to any system I need to work on without booting from the main HDD. In attached this HDD

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Installing FreeBSD 9.1 into a gmirror

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Late last week I installed FreeBSD 9.1 onto a gmirror, which I created during the install process. I documented it via photographs and comments. Hopefully, the next time I do this, it will be useful to refer to this resource. NOTE that when I did this, the partitions were not aligned properly. See the comments in the above URL for details. I will be covering this in a future post.

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