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• Restoring an Ubuntu Server using ZFS RAIDZ for data

  - by andybjackson

  Having become disillusioned with hacking Buffalo NAS devices, I've decided to roll my own Home server. After some research, I have settled on an HP Proliant Microserver with Ubuntu Server and ZFS (OS on 1 Ext4 disk, Data on 3 RAIDZ disks). As Joel Spolsky and Geoff Atwood say with regards to backup, I can't rest until I have done a restore in all of the failure scenarios that I am seeking to protect against. Q: How to configure Ubuntu Server to recognise a pre-existing RAIDZ array? Clearly if one of the data disks die - then that is a resilvering scenario, which is well documented. If two of the data disks die, then I am into regular backup/restore land. If the OS dies and I can restore, also an easy scenario. But if the OS dies and I can't restore, then I need to recreate an Ubuntu server. But how do I get this to recognise my RAID-Z array? Is the necessary configuration information stored within and across the RAIZ array and simply need to be found (if so, how)? Or does it reside on the OS ext4 disk (in which case how do I recreate it)?

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• Restoring an Ubuntu Server using ZFS RAID-Z for data

  - by andybjackson

  Having become disillusioned with hacking Buffalo NAS devices, I've decided to roll my own Home server. After some research, I have settled on an HP Proliant Microserver with Ubuntu Server and ZFS (OS on 1 Ext4 disk, Data on 3 RAID-Z disks). As Joel Spolsky and Geoff Atwood say with regards to backup, I can't rest until I have done a restore in all of the failure scenarios that I am seeking to protect against. Q: How to configure Ubuntu Server to recognise a pre-existing RAID-Z array? Clearly if one of the data disks die - then that is a resilvering scenario, which is well documented. If two of the data disks die, then I am into regular backup/restore land. If the OS dies and I can restore, also an easy scenario. But if the OS dies and I can't restore, then I need to recreate an Ubuntu server. But how do I get this to recognise my RAID-Z array? Is the necessary configuration information stored within and across the RAID-Z array and simply need to be found (if so, how)? Or does it reside on the OS ext4 disk (in which case how do I recreate it)?

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• Running Ubuntu Server from a USB key / thumb drive (being mindful of flash's write limitations)

  - by andybjackson

  Having become disillusioned with hacking Buffalo NAS devices, I've decided to roll my own home server. After some research, I have settled on an HP Proliant Microserver with Ubuntu Server and a ZFS RAID-Z array for data. I settled on this configuration after trying and regretfully rejecting FreeNAS because the Logitech Media Server (LMS) software isn't available on the AMD64 flavour of this platform and because I think Debian/Ubuntu server is a better future-proof platform. I considered Open Media Vault, but concluded that it isn't quite yet ready for my purposes. That said, FreeNAS does include the option to run itself off a 2GB+ flash device like USB key or thumb drive. Apparently FreeNAS is mindful of the write limitations of flash devices and so creates virtual disks for running the OS, writing only the required configuration information back to flash. This would give me an extra data drive slot. Q: Can Ubuntu Server be configured sensibly to run off a flash device such as a USB key/thumb drive? If so, how? The write limitations of flash should be accounted for.

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• AirPort Express Discoverability

  - by andybjackson

  I bought an AirPort Express to enable music in a different part of a friend's house using the AirTunes feature. Unfortunately, iTunes or the AirPort Utility don't reliably discover the existence of the device. If I use the "Configure Other..." function within the AirPort Utility and enter the AirPort Express' IP address and password, then I can reliably get access in a daughter window to configure it. This seems to nudge the underlying AirPort Utility into "finding" and displaying the AirPort Express, which it doesn't do on its own even after clicking the "Rescan" button. iTunes then also seems to cotton on to this discovery and present the AiportExpress as an AirTunes option at the bottom right of iTunes. Things then works as we'd like them to. If I close down the AirPort Utility, then iTunes loses the AirPort Express AirTunes speaker, often giving "An unkown error (-15006) occurred while connecting to the remote speaker". Of course, starting the Airport Utility, forcing it to recognise the Airport Express and then starting iTunes, isn't the ease of use I was after. Background info: iTunes is running on Windows XP. The AirPort Express is running in wireless client mode (i.e. is connecting to an unsecured wireless network in the house with nothing connected to its ethernet port). The network router is a Swisscom Motorola 3347NWG (with firmware 7.8.5r1). I have already tried: Disabling the Windows XP firewall Updating the AirPort Express firmware, the AirPort Utility and the router firmware Ensuring Wireless privacy and similar potetnially problematic router settings are off Solutions, or even just ideas of other things to try would be gratefully received.

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