Drive Allocation Unit Size

-

when setting hyper-v clustered nodes, each node has (2) raid 1 525gb ssd drives server os , attached shared storage. know allocation unit size shared drives should 64k sql server , vhdx files. however, allocation unit size os drives on hyper-v host os , vm os on vhdx. okay leave default or should 64k too?

for drives holding vhds/vhdxs there several forum posts here support 64k being ideal:

for guest os formatting there lot of supporting documentation indicates 4k performance oriented:

hyper-v allocation unit sizes

in hyper-v, vhd files use 512-byte internal disk input/output (i/o) operations, , vhdx files use 4,096 byte internal i/o operations.  therefore, default 4,096 ntfs allocation unit size aligns characteristics of vhdx virtual disk file.  however, if use 64 kb allocation unit size on vhdx, system must read each 64 kb allocation unit, cache it, modify 4,096 bytes of it, , write whole thing vhdx file, negatively affects performance.  70-740 page 84.




Windows Server  >  Hyper-V



Comments

Post a Comment

Popular posts from this blog

Edit Group Policy

-
i have pc has power settings pushed out default domain policy in ad environment. of course on local machine "some settings managed system adminstrator". the machine temporarily no longer in contact domain controller (it's been physically moved , not on same network now) can't updated gpo settings. i believe if edit local group policy won't make difference because of group policy processing , precedence. since it's temporary away ad network, still want use settings of ad user. is there somewhere in registry stored can edit power plan manually until can sync domain? (i need prevent sleeping while plugged in - it's set 1 hour) thanks! allen crist i found site: http://gpsearch.azurewebsites.net/#7916 i able add policy to hkey_local_machine\software\policies\microsoft\power using specs found on site. looks solved issue. i'll report if didn't. thanks! allen crist ...
Read more

Hyper-V VM not reaching OS 'Logon' screen

-
i trying migrate vm vmware hyper-v. so far have done following (seemingly successfully): prepare vmware vm conversion hyper-v format (vhd) within vmware workstation 8.0 environment following steps guide: http://social.technet.microsoft.com/forums/en/winserverhyperv/thread/ef8c12f7-c45d-442e-9a30-c43cd87df3b3   (i.e. remove vm tools, add new ide hard disk…) use vmdk2vhd application convert individual vmdk files vhd ones create new vm in hyper-v exporting in 3 newly converted vhd files at point have checked settings , powered on vm in hyper-v find although windows begins load expected manages reach screen prior login screen saying either of following messages: “windows starting up…” “the active directory rebuilding indices… please wait” to knowledge, albeit limited in area, vm should present me login screen since appears in vmware. if start vm in safe mode can login not desired affect. below details of vm: operating system: windows server 2003 (enterprise edit...
Read more

DNS question...

-
i new setting dns server....my domain name expl. "domain.com"....i set "a" record in forward lookup for  www.domain.com itself...."server's local ip"....i've added no other zones , i seem able resolve names except own....www.domain.com.....also, do i put my isp's dns ip's....for external dns's server can't resolve?....forwarding or in nic setup?......i want setup in my dns server don't have include them on client side..... thanks mark     not put isp dsn server address in settings on nic dc or clients. should point local dns server on dc. set dns forward public dns, such isp. bill Windows Server  >  Network Infrastructure Servers
Read more