Roch - PAE wrote:
> Why do you want greater than 128K records.
>
A single-parity RAID-Z pool on thumper is created & it consists of four
disk.Solaris 10 update 4 runs on thumper.Then zfs filesystem is created in
the pool.1 mb data is written to a file in filesystem using write (2)
system call.However dtrace displays too many small sized physical disk
read
when the same 1 mb data is read using read() system call.recordsize is
set to 128k.
What's going on here ? why so many small size block read is done ?
if 0LARGE option need to be mentioned at the time of creating this file
to tell , so that zfs use bigger block size.
I think, zfs does use block size as per the following statements.
ZFS files smaller than the recordsize are stored using a single
filesystem block (FSB) of variable length in multiple of a disk sector
(512 Bytes).
Larger files are stored using multiple FSB, each of recordsize bytes,
with default value of 128K.
dtrace output :
Event Device Device
PathName RW Block Size Block
No Offset Path
sc-read . R 1052672 0 /mnt/bank0/media/CAD1/4.1
fop_read . R 1052672 0 /mnt/bank0/media/CAD1/4.1
disk_io sd6
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 65536
50816 0 <none>
disk_io sd21
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 65536
50816 0 <none>
disk_io sd48
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 65536
50816 0 <none>
disk_io sd48
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 131072
47839 0 <none>
disk_io sd48
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
48095 0 <none>
disk_io sd48
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
48352 0 <none>
disk_io sd48
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
48523 0 <none>
disk_io sd48
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
48950 0 <none>
disk_io sd48
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
49121 0 <none>
disk_io sd6
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 131072
48096 0 <none>
disk_io sd6
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
48352 0 <none>
disk_io sd21
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
48267 0 <none>
disk_io sd21
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
48438 0 <none>
disk_io sd6
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
48523 0 <none>
disk_io sd6
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
48951 0 <none>
disk_io sd21
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
49891 0 <none>
disk_io sd21
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 44032
50062 0 <none>
disk_io sd6
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
49378 0 <none>
disk_io sd13
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
47668 0 <none>
disk_io sd13
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
47839 0 <none>
disk_io sd13
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
48608 0 <none>
disk_io sd13
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
49036 0 <none>
disk_io sd13
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 131072
49207 0 <none>
disk_io sd13
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 43520
50062 0 <none>
disk_io sd13
/devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]/[EMAIL PROTECTED],0:a R 87552
49463 0 <none>
Thanks
Manoj Nayak
> Do Check out :
> http://blogs.sun.com/roch/entry/128k_suffice
>
> -r
>
>
> Manoj Nayak writes:
> > Hi All,
> >
> > Is it not poosible to increase zfs record size beyond 128k.I am using
> > Solaris 10 Update 4.
> >
> > I get following error when I try to set zfs record size to 1024 k.
> > zfs set recordsize=1024k md9/test
> > cannot set property for 'md9/test': 'recordsize' must be power of 2 from
> > 512 to 128k
> >
> > Thanks
> > Manoj Nayak
> > _______________________________________________
> > zfs-discuss mailing list
> > zfs-discuss@opensolaris.org
> > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>
>
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