[Libguestfs] [PATCH v2v] v2v: -it vddk: Don't use nbdkit readahead filter with VDDK (RHBZ#1832805).

[Pino Toscano]

On Thursday, 28 May 2020 13:22:53 CEST Richard W.M. Jones wrote:
> This filter deliberately tries to coalesce reads into larger requests.
> Unfortunately VMware has low limits on the size of requests it can
> serve to a VDDK client and the larger requests would break with errors
> like this:
> 
>   nbdkit: vddk[3]: error: [NFC ERROR] NfcFssrvrProcessErrorMsg: received NFC error 5 from server: Failed to allocate the requested 33554456 bytes
> 
> We already increase the maximum request size by changing the
> configuration on the VMware server, but it's not sufficient for VDDK
> with the readahead filter.
> 
> As readahead is only an optimization, the simplest solution is to
> disable this filter when we're using nbdkit-vddk-plugin.
> 
> Thanks: Ming Xie
> ---

LGTM.

-- 
Pino Toscano
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