Re: [squid-users] squid with coss can not write to SSD

On 07/01/11 19:40, Drunkard Zhang wrote:
> My configuration:
> cache_dir coss /mnt/c/72 10240 max-size=524288 max-stripe-waste=32768
> block-size=4096 maxfullbufs=10
> cache_swap_log /mnt/s/%s
>
> /mnt/c/72 is a file on btrfs + SSD. The btrfs is created by:
> "mkfs.btrfs /dev/sdb1 /dev/sdc1", so it will spanning across two SSDs.
>
> But squid did not write anything to disk, here's info in cache.log
>
> 2011/01/07 14:36:42| WARNING: failed to unpack meta data
> 2011/01/07 14:36:42| storeCossWriteMemBufDone: got failure (-6)
> 2011/01/07 14:36:42| FD 9, size=1048576
> 2011/01/07 14:36:42| WARNING: failed to unpack meta data
>
> Why? squid can't work with btrfs? or SSD? or my way using it?

COSS swaps its data to and from disk in slices of 1MB (as you can see in
"FD 9, size=1048576" size= is in bytes). Check that your SSD filesystem
can handle files written across the disk boundary without corruption.

Squid handles one cache_dir per spindle (in this case per SSD) much
better than multiple-disk filesystems. You will get more efficient
results configuring each SSD as a separate cache_dir.

Amos

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