Chris
Guest
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 Posted:
Sun Oct 03, 2004 1:58 am Post subject:
Smart 642 RAID |
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I have Smart 642 RAID card with 1 channel and 3x36GB disks for mail server
with shell users and their personal web pages)- my question is related to
configuration and I/O performance. I have two ideas:
a)
1. disk standalone (faster write ?) - especialy because of fast growing
/var) with swap, /, /usr, /var
2. and 3. disk in RAID 1 with /home (slower write, faster read ?)
b)
all three disks in RAID 5
What's happend with performance with
one standalone disk and two disks in RAID 1, all on the same channel ?
Is it better with all three in RAID 5 (slower write ?) ? |
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Ron Reaugh
Guest
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| Posted:
Sun Oct 03, 2004 2:38 am Post subject:
Re: Smart 642 RAID |
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"Chris" <kchriska@yahoo.com.com> wrote in message
news:cjn8b6$4er$1@bagan.srce.hr...
| Quote: | I have Smart 642 RAID card with 1 channel and 3x36GB disks for mail server
with shell users and their personal web pages)- my question is related to
configuration and I/O performance. I have two ideas:
a)
1. disk standalone (faster write ?) - especialy because of fast growing
/var) with swap, /, /usr, /var
2. and 3. disk in RAID 1 with /home (slower write, faster read ?)
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RAID 1 writes about the same speed as a single disk. RAID 1 reads about the
same speed as a single disk except that it can do two independent reads
simultaneously.
| Quote: | b)
all three disks in RAID 5
What's happend with performance with
one standalone disk and two disks in RAID 1, all on the same channel ?
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If the SCSI channel bandwidth is sufficient then there should be little
impact.
| Quote: | Is it better with all three in RAID 5 (slower write ?) ?
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A single standalone disk doesn't necessarily write faster than a RAID 5
array. The deal is that a RAID 5 array doesn't write as fast as RAID 5
reads and RAID 5 arrays read faster than a single disk. Overall you're
probably better off using 3 disk RAID 5. |
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