Date: Sun, 17 Jun 2018 14:04:05 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-arm@freebsd.org Subject: Re: Raspberry Pi 2B and SSD drive Message-ID: <aac145ec-7f43-d408-48b7-f0bbb4579133@denninger.net> In-Reply-To: <20180617205547.Horde.0vOU2_N8C0NmcgeJBSHSR5m@webmail.nethead.se> References: <c38a0dbd-5ed6-2c75-b21e-46e021be90ff@nethead.se> <20180617184301.GA50150@www.zefox.net> <20180617205547.Horde.0vOU2_N8C0NmcgeJBSHSR5m@webmail.nethead.se>
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This is a cryptographically signed message in MIME format. --------------ms060509030403020603050802 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 6/17/2018 13:55, Per olof Ljungmark wrote: > Hi, > > Quoting bob prohaska <fbsd@www.zefox.net>: > >> On Sun, Jun 17, 2018 at 03:21:33PM +0200, Per olof Ljungmark wrote: >>> FBSD 11.2-RC1 >>> >>> How can I make good use of a USB SSD drive connected to the Pi? >>> >> It might help if you indicated what constitutes "good use" 8-) > > As just stated, a light duty smtp-server, and I need better > reliability, not speed, than what a SD card usually offers. > >>> For instance, can I start from the SD card and then hand over >>> everything >>> to the SSD drive? From googling it does look like it is possible. >>> >> Going out on a limb here, but I don't think it'll make much difference= =2E >> >> Personally I like to leave root on microSD and keep /usr, /var, /tmp >> and swap on USB flash. Far as I know USB is the only mass storage >> connection interface, so that bottleneck is unavoidable. >> >> Having the booting bits separate from the scribbling bits offers a >> little >> protection against a totally unbootable system in case of user error o= r >> other mishap. It's still necessary to make provision for a serial >> console, >> since last I checked one can't talk to single user via USB keyboard. >> > > Makes sense of course. > IMHO do not put "scribbling bits" on SD card; they're not made for it, it's wildly abusive to them to do so, and they *will* fail if subjected to that in a moderate-to-heavy load environment, at which point the unit usually panics and is unbootable when it comes back up. Oh, and it's also wildly *slow* too, so there's another reason not to. Putting that on a USB-attached spinning rust device works reasonable well; an SSD is gross overkill for this application and likely not much help too, as an SSD that takes an unexpected power loss and is not designed to be power-fail tolerant has a decent chance of coming back un-fsckable (or worse, it fsck's ok but has corruption that is invisible on it that causes an immediate panic when referenced) due to the lack of coherence in writes when the power goes off. Power-fail-safe SSDs are expensive; the only one I've found that's not ridiculously-so are the Intel 730 series, of which I own several -- they have passed repeated "plug pull" tests while running a Postgres test app that is intentionally designed to detect any sort of game-playing when it comes to claims of "I committed that write" when it really did not. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms060509030403020603050802 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw 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