mmt

29 ms·

211.
by mmt 8y ago
> Tape is the purest implementation of magnetic storage concepts. As such it is going to improve faster than HDDs I agree with the former, but I think your conclusion misses a critical piece of technology development: volume (which drive
212.
by mmt 8y ago
HDDs, yes, but tapes, no. That is, HDDs are generally unbounded in the parallelism because disk bays are cheap [1] and plentiful. OTOH, tape drives are expensive, multiple thousands of dollars, which makes them scarce. [1] $100/bay in
213.
by mmt 8y ago
I don't think this is true for the general case, though. At some point one has to declare that the data has "arrived" in its usable form at the destination, and RAM seems like the wrong threshold (since, for now, it's vo
214.
by mmt 8y ago
So, for a lay person, what's the summary? Does using optics as an interconnect in an otherwise electrical system add noticeable latency?
215.
by mmt 8y ago
> have to somehow manipulate Now I fear you're just putting words in my mouth, and certainly not responding to the strongest possible reading of my comment. Regardless, the implication that any domestic animal can have a diet that i
216.
by mmt 8y ago
> Of a high profile and high quality enterprise disk, unlikely to appear in 99% of RAID setups. > Most RAID setups in the wild consist of low quality enterprise or even desktop platters, high quality setups are rare and expensive >
217.
by mmt 8y ago
> How expensive is cat litter where he lives? It's the US, so about $10 for 35lbs of "Litter Purrfect" from Costco. Around 20lbs/month/cat was his pre-robot, usage, IIRC, and he had multiple cats. > For me, it
218.
by mmt 8y ago
> The same way the gp expressed it, that the robot was bad at dealing with the cats excretions. That (what the GP/OC expressed) omits the intellectual-curiosity point I was trying to get across: why? Is there something backwards in
219.
by mmt 8y ago
> URE Rate is documented in most handbooks or manuals on harddisks, it's usually about 10^-12, though this is a worst case error rate and -13 or -14 is more realistic. The kind of literature I'm looking for is based on real wor
220.
by mmt 8y ago
I think "Omega" is a current brand of one of these. The Litter Robot is essentially an automated/motorized version of this. Interestingly, according to a friend of mine who ran experiments with his cats, the robot version was
221.
by mmt 8y ago
> Is this facetious It is not. > backwards, in my opinion What would be the forwards way to express the same concept?
222.
by mmt 8y ago
This has become my least favorite question to answer, partly because the rabbit hole is too deep for a limited amount of time, and mostly because it has so little to do with the job I'm interviewing for. It also feels so tedious, havin
223.
by mmt 8y ago
> RAID risk is about your rebuild failure rate, in this case URE (Unrecoverable Read Error). This seems to be the keystone to your reasoning, and I'm not sure it's true, in practice. IME and in the literature I've read, mo
224.
by mmt 8y ago
> I've tried all the other robotic litter boxes too, and they all suck. I wonder if there's something about your cats' diet that renders their excretions too incompatible with what the robots are designed for. When we swit
225.
by mmt 8y ago
> You may wear out your (spinning) disks with scrubs more than you do with real workloads. This seems like an extraordinary claim requiring extraordinary evidence, especially since the notion of wear out is only applicable to SSDs (as sh
226.
by mmt 8y ago
RAID6, which provides two drives worth of parity compared to RAID5's single drive worth of parity, is the most common successor, especially in hardware (ASIC) implementations. Other examples are ZFS's RAID-Z, which can support eve
227.
by mmt 8y ago
> RAID5 definitely has a purpose, notable small arrays where RAID6 would be wasting space This doesn't quite make sense to me. Why would the size of the array make any difference as to whether or not the extra drives needed by RAID6
228.
by mmt 8y ago
I'd agree with the first part, that smaller (earlier) startups may be better for learning more breadth, but there's still a pretty substantial range of sizes before reaching "large". Startups, VC-funded in particular,
229.
by mmt 8y ago
Relocation isn't something I'm open to, at this point. (Being in the SF Bay Area, I'm not yet worried that this limits me excessively). I suppose it's also worth noting that I'm sceptical that any organization that
230.
by mmt 8y ago
> If it's deterministic enough to be worth sourcing drives from different batches, I suspect you're using a mistaken premise. It's worth sourcing from different batches because failures are not deterministic. Instead, we
231.
by mmt 8y ago
That strikes me as a bit contradictory, since I would consider RAID1 (plus the redundancy across enclosures) to be the equivalent to even "hotter"[1] spares. Unlike the hot (warm) and cold spares for the RAID5/6, all the driv
232.
by mmt 8y ago
Did you mean to reply to my above question? If so, I'm unclear as to what you're trying to get across. Is ZFS scrubbing different than the other RAIDs' (scheduled or schedulable) reads of the entire array, other than nomencla
233.
by mmt 8y ago
SF is also famous for its hills, especially the steepness of some, which creates an additional barrier to cycling beyond the usual "not for everyone".
234.
by mmt 8y ago
> Isn't this one true to some extent though? People who write software for a living tend to think so, but the "some extent" is the real issue. For many classes of problems, merely spending more money on hardware (or proced
235.
by mmt 8y ago
Just like with any "crowdsourced" review site, I find value in the reviews, even if I don't, strictly, trust them. Of particular value are multiple reviews that corroborate certain details, especially in the absence of review
236.
by mmt 8y ago
Presumably with what's called a "reasonable accomodation". For example, interviewers always facing the candidate to facilitate lip-reading and allowing use of a speech synthesizer. Perhaps even paying for a sign-language inte
237.
by mmt 8y ago
> You always want to use mixed lot numbers or disks with significantly different manufacturing dates in your arrays. For the few of us left who know how to do this (or even that it's beneficial to do in the first place), it's
238.
by mmt 8y ago
That's also proper RAID5/6 maintenance. My main/recent familiarity is with LSI hardware RAID implementation, where they call it a "patrol read". I believe mdraid has checkarray. I'm not sure if you meant to imp
239.
by mmt 8y ago
I agree, and I see this same effect of dismissing an entire specialty based primarily on experience as "easy" even within tech, such as what some programmers (Devs) think of sysadmins (Ops). I also agree that us-vs-them is harmful
240.
by mmt 8y ago
Is the speed of light for light-in-some-substrate sufficiently faster than the speed of light for electrical charge? Is there any speed penalty for converting between the two?

More ›