TOPIC: Using hdd instead of ssd for writeback in diskless

mga 15 pc kaya ok lang na hdd gamitin para sa writeback??

ok lang. why not use more than one hdd to reduce delay and compensate for the lack of speed of hdd and if you want to stick with hdd, set your drives to RAID 0 to increase performance since you do not care about information with writebacks anyway

2 HDD kaya na yung 30

tag wrote: ok lang. why not use more than one hdd to reduce delay and compensate for the lack of speed of hdd and if you want to stick with hdd, set your drives to RAID 0 to increase performance since you do not care about information with writebacks anyway

Nasubukan mo na ba yang raid0 sa writeback sir? Ganyan dati setup ko nung TAE plang naka raid0 yung writeback ko, tinigilan ko lng nung nagkaroon ng clicking sound yung isang hdd, tapos nabasa ko don sa server hw requirement ni ccboot di daw advisable yung raid sa writeback. shit haha..

eto sabi:

4) Two SATA/SAS/SSD HDD is used for client write-back disk. We don't NOT recommend to use RAID for write-back disks. If one disk is broken, we can use the other one. If using RAID for writeback disk, one disk broken will cause all clients stop. On the other hand, CCBoot can do balance for writeback disk. Two disks write performance is better than one RAID disk. Using SSD as writeback disk is better than SATA. SSD has good IOPS. The street said the writing activities are harmful for the lifetime of SSD. In our experience, one SSD for writeback disk can be used for three years at least. It's enough and worth.

mas mgnda raid0 gnyan gmit ko dati.. kya lng nsira na yung isa..bumili na lng ako ng SSD :)

I do not recommend what I haven't tested myself. so the answer is yes. One disk going bad on your RAID setup was not the problem, it was your disk drive that went sour, so kahit single disk ang ginamit nagkaproblema ka rin regardless. You opt to use HDD instead of SSD as your writeback as you said in your subject so you will get responses pertaining to that. so yes hdd is okay with diskless as writeback, its just a matter of balancing as to how many clients and how many hdd you will use, slower but it wil work if you are under a tight budget.

ano talaga ang mas ok sa 2

sa writeback ssd or hdd

sa swap naman ano din mag ok ssd vs hdd

kung bakit kasi hindi nire-recommend ang hdd sa writeback ay dahil sa iops, dahil sa read/write intensive ang writeback, hindi recommended ang hdd kasi mababa lang ang iops nito, dahil ipoposition p yng head/platter ng mabilisan kaya dahil dito madaling masisira ang hdd, hindi katulad ng sa ssd walang mechanical parts, mabilis ang iops kaya kahit madaming read/write operation ay kakayanin ng ssd dahil mataas ang iops pa nito...tingin ko kahit iraid 0 ang 2 hdd pra sa writeback ganun dn ang magiging problema, madadali ang buhay hdd dahil sa mabilis na repositioning ng head/platter dahil sa writeback operation...kaya kung gagamit man ng hdd pra sa writeback, magiging malaking tulong siguro kng meron kang cache application...

kung meron akong 2 hdd

1st hdd sa os image
2nd hdd sa gamedisk image

tapos

2 ssd para sa mga cache nila wb

intel 540 240gb os image wb
intel 540 240gb gamedisk image wb

ano naman po ang use ng swap drive

depende kasi yng writeback sa # of units...kaya yung ibang sumasagot dito sa thread, sinasabi "depende sa # of clients/units" kung konti lang naman, pwede na siguo pagisahin sa isang ssd yng o.s. image at writeback....sa akin kasi ganito setup ko, titingnan mo lang talaga na wag mapupuno sa 20% ng freespace ng ssd mo dahil sa writeback, dahil bumabagal ang operation ng ssd once na medyo napupuno na sya...at kelangan mo rin ng o.s. na supported ang trim operation sa ssd...

more info sa trim

sakin kasi ganito formula ko sa size ng ssd na kelangan mo (subjective to ha)

bale 3gb (writeback per client) x # of units + o.s. image, example 20units...3gb x 20 = 60gb + o.s. image mo (sample 15gb win10 img) = 75gb, so bibili ka ng 120gb na ssd para malaki pa free space sa ssd 120gb - 75gb = roughly 40gb, at kelangan mo rin iconsider kung saka-sakali kang magdagdag ka ng units...