[vpsFree.cz: community-list] Jaky server (pro virtualizaci)??

Sat Nov 19 11:58:13 CET 2016

Zastav se na IRC a pokecame o tech problemech, co mas se ZFS s O_DIRECT
a tak, minimalne bych mohl vedet o nejakym funkcnim workaroundu nebo
tak, pokud nenajdem primo reseni.

Jinak Bcachefs a obecne Linuxovy FS budou inferior k ZFS vzdycky z
jednoduchyho duvodu - ZFS je storage box plugged in your kernel cca, tj.
resi i spoustu veci okolo, co v linux ekosystemu "resi" jadro ("resi"
protoze pagecache, IO scheduler a podobne jsou spis spatnej vtip pro
serverovy use-cases).

/snajpa

On 11/19/2016 11:50 AM, info [at] iostream.sk wrote:
> Mno,
> 
> tiez sme prechadzali na ZFS(preto sa nam tych hw raid kariet bez JBOD /
> passthrough zopar tu povaluje), ZFS resp v buducnosti _dufajme_ bcachefs
> su pre 80% beznych workloadov dobra volba aaale tak stale sa najdu
> pripady kde hwraid s bat je vhodnejsia({DB} nad R10 napr).. a zfs ako
> sam vies ma tiez svoje muchy(+ chybajuci wrapper na O_DIRECT robi
> problemy s kadecim - sry ak uz poriesili)
> 
> Inu ak niekto ma chechtaky navyse podporte vyvojara
> 
> https://bcache.evilpiepirate.org/
> https://www.patreon.com/bcachefs
> 
> Este ohladom tej ponukanej zostavy, mame ich 2 + 1 takpovediac na
> nahradne diely, asi 8 QL 4GBps FC(optika) kariet a za krabicu gigovych
> dual sietoviek (tu je na mieste podakovat panom z financneho "priemyslu").
> 
> 
> D.
> 
> 
> 
> On 11/19/2016 10:44 AM, Pavel Snajdr wrote:
>> Jaky je duvod v roce 2016 doporucovat nekomu HW raid? ;)
>>
>> IMHO je to akorat za trest, ne ze by to bylo k necemu dobry...
>>
>> A jeste to sam priznas na prikladu s konvici ;)
>>
>> UPS neni potreba, Xeon E3 muze byt malo velmi snadno - je to jenom
>> desktopova rada procesoru a neda se tam dat vic jak 32G RAM.
>>
>> Budto se bavime o masine na vyvoj, nebo na produkci. Tohle mela byt
>> masina na vyvoj - kdyz nejde stava v kanclu, nejde ani masina na vyvoj,
>> to je logicke, UPS netreba.
>>
>> /snajpa
>>
>> On 11/19/2016 08:32 AM, Ondrej Beranek wrote:
>>> Par tipu. Vzhledem k tomu ze mate snahu centralizovat tak se ti z toho
>>> brzo stane dost nezbytna soucast.
>>> Chces:
>>> Xeon e3
>>> - cim vic virtualu tim vic vykonu padne na virtualizaci
>>> Hw Raid pole
>>> - az na tom pojede xxx veci urcite nechces resit problemy ze odesel disk
>>> a nebo ze je malo mista / disky se dusi(ztrata vykonu pole)
>>> - ups
>>> Nekde vypadne konvice a diky tomu ze mas raid pole se spoustou dat v ram
>>> a databaze nejsou zapsany komplet tak vypadek proudu zpusobi poskozeni
>>> dat. Typicky ti staci 5min aby doslo k sync.
>>>
>>> Dne 18. 11. 2016 5:47 PM napsal uživatel <info at iostream.sk
>>> <mailto:info at iostream.sk>>:
>>>
>>>     Oprava, 2x x5570
>>>
>>>     On 2016-11-18 16:35, info at iostream.sk <mailto:info at iostream.sk> wrote:
>>>
>>>         cau, za +/- 400Eur/ks ti mozem predat IBM x3650 M2 s 2x Xeon E5570,
>>>         cca 56GB DDR3 + 4gbps FC, hw raid a nejaku tu intelacku
>>>         dual-sietovku
>>>         k tomu, vs bez diskov, presnu konf na poziadanie
>>>
>>>         dodo
>>>
>>>         On 2016-11-18 15:17, Tomas Srnka wrote:
>>>
>>>             Ahoj,
>>>
>>>             To je docela prestrelena cena, pozri si co to stoji na aukru
>>>             napr.
>>>             http://aukro.cz/hp-proliant-dl380-g7-24x2-26ghz-48gbram-ddr3-i6604756304.htm
>>>             <http://aukro.cz/hp-proliant-dl380-g7-24x2-26ghz-48gbram-ddr3-i6604756304.htm>
>>>             l .
>>>
>>>             Tomas
>>>
>>>
>>>             -----Original Message-----
>>>             From: community-list-bounces at lists.vpsfree.cz
>>>             <mailto:community-list-bounces at lists.vpsfree.cz>
>>>             [mailto:community-list-bounces at lists.vpsfree.cz
>>>             <mailto:community-list-bounces at lists.vpsfree.cz>] On Behalf
>>>             Of Honza Straka
>>>             Kasparek
>>>             Sent: Friday, November 18, 2016 12:56 PM
>>>             To: vpsFree.cz Community list
>>>             <community-list at lists.vpsfree.cz
>>>             <mailto:community-list at lists.vpsfree.cz>>
>>>             Subject: Re: [vpsFree.cz: community-list] Jaky server (pro
>>>             virtualizaci)??
>>>
>>>             G7 jsou tam tyhle:
>>>
>>>             HP ProLiant DL380 G7, 1x Xeon E-5645 2.40 GHz, P410i 256 MB,
>>>             RAM 6 GB 3x2GB
>>>             2RX8 PC3 10600R, 3x 300 GB 10K SAS 653955-0013, 2x 460 W
>>>             511777-001,
>>>             DVD-ROM, 4x FAN HP ProLiant DL380 G7, 1x Xeon E-5640 2.67
>>>             GHz, P410i 512 MB,
>>>             RAM 6 GB 3x2GB 2RX8 PC3 10600R, 3x 146 GB 10K SAS
>>>             507283-001, 2x 460 W
>>>             511777-001, DVD-ROM, 4x FAN
>>>
>>>             15.000Kc bez DPH za kus
>>>
>>>             RAMky mi tam prijde malo, takze ta by asi jeste chtela navysit.
>>>
>>>             Honza
>>>
>>>             2016-11-10 13:08 GMT+01:00 Pavel Snajdr <snajpa at snajpa.net
>>>             <mailto:snajpa at snajpa.net>>:
>>>
>>>                 Co chteji za tu G7 a v jaky je konfiguraci?
>>>
>>>                 Osobne mi prijde cokoliv nez E5 moc stary (E5 = Sandy
>>>                 Bridge). Cili
>>>                 G8, ale i ta G7 muze jeste stacit v pohode (s vyhledem
>>>                 na budoucnost).
>>>
>>>                 My jsme @vpsFree na stejny generaci, jako je G7, v
>>>                 podstate zacinali,
>>>                 kdyz nepocitam uplne prvni core2quad masinu (odpovida
>>>                 G6) a bylo to v
>>>                 pohode; jeden quadcore s 24GB RAM byl OK na cca 30
>>>                 kontejneru.
>>>
>>>                 /snajpa
>>>
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>>
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