[mythtv-users] An SSD for Backend OS / Database Drives?
Douglas_Peale at comcast.net
Thu Mar 15 15:04:13 UTC 2012
On 2012/03/15 03:09 AM, PJR wrote:
> On 15/03/12 02:50, Andre wrote:
>> On 15 Mar 2012, at 03:13, Douglas Peale wrote:
>>> On 2012/03/14 02:29 PM, tortise wrote:
>>>> My Server's OS/Database HDD is possibly showing signs of aging being an
>>>> older and noisier 7200 120G that's got a few bad sectors reallocated.
>>>> Having found SSD on frontends give a significant user speed upgrade
>>>> (faster on/off and faster menu responses) I am now considering replacing
>>>> the backend OS drive with an SSD. (Also 3 x 2TB drives for recordings
>>>> seem happy there)
>>>> Some of the new 6G series 3 SSD's such as the Adata S510's seem a
>>>> possible replacement, capable of 550/510MB read and write speeds.
>>>> My motherboard (Gigabyte GA-EP31-DS3L)is a SATA 2 which I understand to
>>>> mean it can transfer 3Gb/s over the SATA interface.
>>>> There seems little point in spending extra on SDD's that run faster than
>>>> the SATA II interface, unless there is no disadvantage...
>>>> The b and B's might be confused somewhere, however it seems the full
>>>> 550/510MB read and writes may be available on the SATA II interface.
>>>> If one uses a SSD on a backend (no frontend use) then the only
>>>> difference I expect I am going to see is faster mythweb page loads,
>>>> which might be nice for the recordings page. The frontend recordings
>>>> lists might also populate quicker. This basically assumes the database
>>>> reads are read from the disc and not from RAM, my understanding is its
>>>> done from the disc, if so there seems considerable scope for speeding up
>>>> the user experience that relies on the myriad of reads?
>>>> Can anyone comment about this analysis, do you agree or see it
>>>> differently? I presume some people have now done this, what has been
>>>> their experience?
>>>> mythtv-users mailing list
>>>> mythtv-users at mythtv.org
>>> I have been using a SSD as a boot disk for a while now.
>>> Pros: I no longer have corrupted recordings due to the disk taking too long to respond (database was swamping the HDD)
>>> Cons: Ubuntu does not boot reliably with a SSD. About one in 5 boots hangs dumping me into busybox, and I must type exit to
>>> continue the boot. This is a problem because I let my system shut down when idle.
>> Ah yes, forgot to mention this, in my defence I very rarely reboot. Ubuntu has some race problems on booting, I found that I needed to put all the recording drive mounts in to rc.local rather than fstab then it booted reliably, I also have to remember not to log in straight away or myth-backend won't be running yet as my tuner cards take a while to initialise.
>> Nice problem to have :-)
> I've been running my mythtv 8.10 FE/BE system for several years now with
> a 30MB SSD for boot and everything but /var/lib/mythtv on which is
> mounted a standard HDD. I've had no problems including running it in
> shut down in idle mode. No changes from the standard install other than
> shut down mode and other features not connected with using an SSD. My
> new 11.10 system in development has a similar configuration using a 60MB
> SSD and 1TB HDD RAID-1 for mythtv recordings etc.
> mythtv-users mailing list
> mythtv-users at mythtv.org
I believe it has something to do with the combination of SSD boot drive and raid mirror standard drive has a home directory. The
SSD boot so fast it tries to access the raid before it is ready.
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